M. N. Pionteck, M. Roeper, B. Koppitz, S. D. Seddon, M. Rüsing, L. Padber, Ch. Eigner, Ch. Silberhorn, S. Sanna, 
Second-Order Nonlinear Piezo-Optic Properties of Single Crystal Lithium Niobate Thin Films,
Phys. Rev. B 111, 064109 (2025),

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C. Kofahl, L. Dörrer, St. Ganschow, H. Wulfmeier, H. Fritze, H. Schmidt, 
Hydrogen and Lithium Tracer Diffusivities as a Funktion of Hydrogen Concentration in Li(Nb,Ta)O3 Single Crystals, 
Solid State Ionics, Vol. 429 (2025), 116968,

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U. Bashir, M. Rüsing, D. Klimm, R. Blukis, B. Koppitz, L.M Eng, M. Bickermann, St. Ganschow,
Thermal conductivity in solid solutions of lithium niobate tantalate single crystals from 300 K up to 1300 K,
J. Alloys & Comp. 1008, 176549 (2024); 

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F. Bernhardt, S. Sanna,
Modeling WO3 beyond the Harmonic Approximation: Theoretical Characterization and Thermal Expansion, 
J. Phys. Chem. C (2025), 1219, 580-590, 

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L. M. Verhoff, M. N. Pionteck, M. Rüsing, H. Fritze, L. M. Eng, S. Sanna,
Two-dimensional Electronic Conductivity in Insulating Ferroelectrics: Peculiar Properties of Domain Walls,
Phys. Rev. Research 6, L042015 (2024), 

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C. S. J. Lee, C. Canalias, R. Buschbeck, B. Koppitz, F. Hempel, Z. Amber, M. Rüsing, L. M. Eng, 
Impact of Ion Exchange on Vibrational Modes in Rb-doped KTiOP⁢O4: A Raman Spectroscopy Study on the Interplay between Ion Exchange and Polarization Switching, 
Phys. Rev. B 110, 214115 (2024), 

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B. Kirbus, S. D. Seddon, I. Kiseleva, E. Beyreuther, M. Rüsing, L. M. Eng,
Probing Ferroelectric Phase Transitions in Barium Titanate Single Crystals via in-situ Second Harmonic Generation Microscopy.
J. Appl. Phys. 136, 154102 (2024). 

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M. Röper, S. Seddon, Z. Amber, M. Rüsing, L. M. Eng,
Depth Resolution in Piezoresponse Force Microscopy,
J. Appl. Phys. (2024) angenommen,

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L. Bollmers, T. Babai-Hemati, B. Koppitz, C. Eigner, L. Padberg, M. Rüsing, L. M. Eng, C. Silberhorn,
Surface-Near Domain Engineering in Multi-Domain X-Cut Lithium Niobate Tantalate Mixed Crystals,
(2024);

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L. Ding, E. Beyreuther, B. Koppitz, K. Kempf, J. Ren, W. Chen, M. Rüsing, Y. Zheng, L. Eng,
Comparative Study of Photo-Induced Electronic Transport Along Ferroelectric Domain Walls in Lithium Niobate Single Crystals,
Appl. Phys. Lett. (2024),

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U. Bashir, D. Klimm, M. Rüsing, M. Bickermann, S. Ganschow,
Evaluation and Thermodynamic Optimization of Phase Diagram of Lithium Niobate Tantalate, Solid Solutions,
(2024),

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C. Kofahl, L. Dörrer, H. Wulfmeier, H. Fritze, S. Ganschow, H. Schmidt,
Hydrogen Diffusion in Li(Nb,Ta)O 3 Single Crystals Probed by Infrared Spectroscopy and Secondary Ion Mass Spectrometry,
Chem. Mater. 36 (2024) 1639-1647,

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M. Zahn, E. Beyreuther, I. Kiseleva, A. S. Lofty, C. J. McCluskey, J. R. Maguire, A. Suna, M. Rüsing, J. M. Gregg, L. M. Eng,
Equivalent-Circuit Model that Quantitatively Describes Domain-Wall Conductivity in Ferroelectric LiNbO3 ,
Phys. Rev. Applied 21 (2024) 024007,

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F. Hempel, F. Vernuccio, L. König, R. Buschbeck, M. Rüsing, G. Cerullo, D. Polli, L. M. Eng;
Comparing Transmission- and Epi-BCARS: A Round Robin on Solid-State Materials;
Applied Optics 63 (1) (2024) 112-121,

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U. Yakhnevych, F. El Azzouzi, F. Bernhardt, C. Kofahl, Y. Suhak, S. Sanna, K. D. Becker, H. Schmidt, S. Ganschow, H. Fritze;
Oxygen Partial Pressure and Temperature Dependent Electrical Conductivity of Lithium Niobate Tantalate Solid Solutions,
Solid State Ionics 407 (2024) 116487;

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P. Gaczyński, Y. Suhak, S. Ganschow, S. Sanna, H. Fritze, K.-D. Becker,
A High-Temperature Optical Spectroscopy Study of the Fundamental Absorption Edge in LiNbO3-LiTaO3 Solid Solutions;
Physica Status Solidi A (2024) 2300972,

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F. Bernhardt, S. Gharat, A. Kapp, F. Pfeiffer, R. Buschbeck, F. Hempel, O. Pashkin, S. C. Kehr, M. Rüsing, S. Sanna, L. M. Eng,
Lattice Dynamics of LiNb1-x TaxO3 Solid Solutions:Theory and Experiment,
Material Science (2024),

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F. El Azzouzi, D. Klimm, A. Kapp, L. M. Verhoff, N. A. Schäfer, S. Ganschow, K.-D. Becker, S. Sanna, H. Fritze,
Evolution of the Electrical Conductivity of LiNb1-XTaXO3 Solid Solutions across the Ferroelectric Phase Transformation,
Physica Status Solidi A (2024) 202400966,

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B. Koppitz, S. Ganschow, M. Rüsing, L. M. Eng,
Ferroelectric Hysteresis Measurement in the LN-LT Single-Crystalline Family: Prospects for LNT;
Physica Status Solidi A (2024) 2300967,

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É. Tichy-Rács, S. Hurskyy, U. Yakhnevych, S. Ganschow, P. Gaczyński, K.-D. Becker, H. Fritze, Y. Suhak,
Influence of Li-Stoichiometry on Electrical and Acoustic Properties and Temperature Stability of Li(Nb,Ta)O3 Solid Solutions up to 900 °C,
Physica Status Solidi A (2024),

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C. Kofahl, J. Uhlendorf, B. A. Muscutt, M. N. Pionteck, S. Sanna, H. Fritze, S. Ganschow, H. Schmidt;
Oxygen Diffusion in Li(Nb,Ta)O3 Single Crystals;
Physica Status Solidi A (2024) 2300959,

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U. Yakhnevych, V. Sargsyan, F. El Azzouzi, A. Kapp, F. Bernhardt, Y. Suhak, S. Ganschow, H. Schmidt, S. Sanna, H. Fritze,
Acoustic Loss in Li(Nb,Ta)O3 at Temperatures up to 900°C,
Physica Status Solidi A (2024) 2400106,

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U. Yakhnevych, M. Kunzner, L. M. Verhoff, J. Ratzenberger, M. Rüsing, S. Sanna, L. Eng, H. Fritze,
High-Temperature Domain Wall Current in Mg-Doped Lithium Niobate Single Crystals up to 400 °C,
Material Science (2024),

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F. Bernhardt, F. A. Pfeiffer, F. Schug, A. Pfannstiel, T. Hehemann, S. Ganschow, M. Imlau, S. Sanna,
Ground- and Excited-State Proprties of LiNb1-x TaxO3 Solid Solutions,
Phys. Rev. Materials 8 (2024) 054403,

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F. Bernhardt, L. M. Verhoff, N. A. Schäfer, A. Kapp, C. Fink, W. Al Nachwati, U. Bashir, D. Klimm, F. El Azzouzi, U. Yakhnevych, Y. Suhak, H. Schmidt, K.-D. Becker, S. Ganschow, H. Fritze, S. Sanna,
Ferroelectric to Paraelectric Structural Transition in LiTaO3 and LiNbO3,
Phys. Rev. Materials 8 (2024) 054406,

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A. Pfannstiel, T. Hehemann, N. A. Schäfer, S. Sanna, Y. Suhak, L. Vittadello, F. Sauerwein, N. Dömer, J. Koelmann, H. Fritze, M. Imlau,
Small Electron Polarons Bound to Interstitial Tantalum Defects in Lithium Tantalate,
Journal of Physics: Condensed Matter (2024),

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C. Kofahl, S. Ganschow, F. El Azzouzi, H. Fritze, H. Schmidt,
Li-Diffusion in Lithium Niobate - Tantalate Solid Solutions,
Solid State Ionics 409 (2024) 116514;

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N. Dömer, J. Koelmann, M. Hesselink, T. Hehemann, A. Pfannstiel, J. Klenen, F. Sauerwein, L. Vittadello, S. Ganschow, M. Imlau,
Long-Lived, Pulse-Induced Absorption in LiNb1-x TaxO3 Solid Solutions: The Case of Three Intrinsic Defect Sites for Electron Localization with Strong Coupling,
(2024);

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J. Ratzenberger, I. Kiselelva, B. Koppitz, E. Beyreuter, M. Zahn, J. Gössel, P. A. Hegarty, Z. H. Amber, M. Rüsing,    L. M. Eng,
Towards the Reproducible Fabrication of Conductive Ferroelectric Domain Walls into Lithium Niobate Bulk Single Crystals,
(2024)

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M. N. Pionteck, S. Sanna,
Photoelastic Properties of Stoichiometric Lithium Niobate from First-Principles Calculations;
Physica Status Solidi A (2024),

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J. Klenen, F. Sauerwein, L. Vittadello, K. Kömpe, V. Hreb, V. Sydorchuk, U. Yakhnevych, D. Sugak, L. Vasylechko, M. Imlau,
Gap-Free Tuning of Second and Third Harmonic Generation in Mechanochemically Synthesized Nanocrystalline LiNb1-x TaxO3 (0 ≤ x ≤ 1) Studied with Nonlinear Diffuse Femtosecond-Pulse Reflectometry,
Nanomaterials 14 (2024) 317,

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U. Acevedo-Salas, B. Croes, Y. Zhang, O. Cregut, K. D. Dorkenoo, B. Kirbus, E. Singh, H. Beccard, M. Rüsing, L. Eng, R. Hertel, E. A. Eliseev, A. N. Morozovska, S. Cherifi-Hert,
Impact of 3D Curvature on the Polarization Orentation in Non-Ising Domain Walls,
Nano Letters 23 (2023) 795-803,

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U. Yakhnevych, C. Kofahl, S. Hurskyy, S. Ganschow, Y. Suhak, H. Schmidt, H. Fritze,
Charge Transport and Acoustic Loss in Lithium Niobate-Lithium Tantalate Solid Solutions at Temperatures up to 900 °C,
Solid State Ionics 392 (2023) 116147,

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E. Singh, M. N. Pionteck, S. Reitzig, M. Lange, M. Rüsing, L. M. Eng, S. Sanna,
Vibrational Properties of LiNbO3 and LiTaO3 Under Uniaxial Stress,
Phys. Rev. Materials 7 (2023) 024420;

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K. J. Spychala, Z. H. Amber, L. M. Eng, M. Rüsing,
Modeling Nonlinear Optical Interactions of Focused Beams in Bulk Crystals and Thin Films: A Phenomenological Approach,
J. Appl. Phys. 133 (2023) 123105,

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U. Bashir, K. Böttcher, D. Klimm, S. Ganschow, F. Bernhardt, S. Sanna, M. Rüsing, L. M. Eng, M. Bickermann,
Solid Solutions of Lithium Niobate and Lithium Tantalate: Crystal Growth and the Ferroelectric Transition,
Ferroelectrics 613 (2023) 250-262,

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C. Kofahl, L. Dörrer, B. Muscutt, S. Sanna, S. Hurskyy, U. Yakhnevych, Y. Suhak, H. Fritze, S. Ganschow, H. Schmidt,
Li Self-Diffusion and Ion Conductivity in Congruent LiNbO3 and LiTaO3 Single Crystals,
Phys. Rev. Mater. 7 (2023) 033403,

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S. Neufeld , U. Gerstmann, L. Padberg, C. Eigner, G. Berth, C. Silberhorn, L. M. Eng, W. G. Schmidt, M. Rüsing,
Vibrational Properties of the Potassium Titanyl Phosphate Crystal Family,  
Crystals 13 (2023) 1423;

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C. Kofahl, L. Dörrer, H. Fritze, H. Schmidt,
Hydrogen Diffusion in Proton-Exchanged Congruent Lithium Niobate during Post-Annealing,
Solid State Ionics 403 (2023) 116383,

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C. Kofahl, S. Ganschow, H. Schmidt,
Experiments on Hydrogen Uptake and Diffusion in LiNb0.15Ta0.85 O3 Single Crystals by Infra-Red Spectroscopy,
Defect and Diffusion Forum 429 (2023) 136-143,

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S. Hurskyy, U. Yakhnevych, C. Kofahl, É. Tichy-Rács, H. Schmidt, S. Ganschow, H. Fritze, Y. Suhak,
Electrical Properties and Temperature Stability of Li-Deficient and Near Stoichiometric Li(Nb,Ta)O3 Solid Solutions up to 900 °C,
Solid State Ionics 399 (2023) 116285,

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H. Beccard, E. Beyreuther, B. Kirbus, S. D. Seddon, M. Rüsing, L. M. Eng,
Hall Mobilities and Sheet Carrier Densities in an Single LiNbO3 Conductive Ferroelectric Domain Wall,
Phys. Rev. Appl. 20 (2023) 064043,

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S. Reitzig, F. Hempel, J. Ratzenberger, P. A. Hegarty, Z. H. Amber, R. Buschbeck, M. Rüsing, L. M. Eng,
High-Speed Hyperspectral Imaging of Ferroelectric Domain Walls using Broadband Coherent Anti-Stokes Raman Scattering,
Appl. Phys. Lett. 120 (2022) 162901,

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J. Rix, M. Rüsing, R. Galli, J. Golde, S. Reitzig, L. M. Eng, E. Koch,
Brillouin and Raman Imaging of Domain Walls in Periodically-Poled 5%-MgO:LiNbO3,
Opt. Express 30 (2022) 5051,

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E. Singh, H. Beccard, Z. H. Amber, J. Ratzenberger, C. W. Hicks, M. Rüsing, L. M. Eng,
Tuning Domain Wall Conductivity in Bulk Lithium Niobate by Uniaxial Stress,
Phys. Rev. B 106 (2022) 144103,

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H. Beccard, B. Kirbus, E. Beyreuther, M. Rüsing, P. Bednyakov, J. Hlinka, L. M. Eng,
Nanoscale Conductive Sheets in Ferroelectric BaTiO3 : Large Hall Electron Mobilities at Head-to-Head Domain Wall,
ACS Appl. Nano Mater. 5 (2022) 8717-8722,

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P. A. Hegarty, H. Beccard, L. M. Eng, M. Rüsing,
Turn All the Lights Off: Bright- and Dark-Field Second-Harmonic Microscopy to Select Contrast Mechanisms for Ferroelectric Domain Walls,
J. Appl. Phys. 131 (2022) 244102;

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P. A. Hegarty, L. M. Eng, M. Rüsing,
Tuning the Čerenkov Second Harmonic Contrast from Ferroelectric Domain Walls via Anomalous Dispersion,
J. Appl. Phys.132 (2022) 214102,

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Z. H. Amber, K. J. Spychala, L. M. Eng, M. Rüsing,
Nonlinear Optical Interactions in Focused Beams and Nanosized Structures,
J. Appl. Phys. 132 (2022) 213102,

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Y. Suhak, D. Roshchupkin, B. Redkin, A. Kabir, B. Jerliu, S. Ganschow, H. Fritze,
Correlation of Electrical Properties and Acoustic Loss in Single Crystalline Lithium Niobate-Tantalate Solid Solutions at Elevated Temperatures,
Crystals 11 (2021) 398,

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S. Reitzig, M. Rüsing, J. Zhao, B. Kirbus, S. Mookherjea, L. M. Eng,
"Seeing is Believing” - In-Depth Analysis by Co-Imaging of Periodically-Poled X-Cut Lithium Niobate Thin Films,
Crystals 11 (2021) 288,

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A. Krampf, M. Imlau, Y. Suhak, H. Fritze, S. Sanna,
Evaluation of Similarities and Differences of LiTaO3 and LiNbO3 based on High-T-Conductivity, Nonlinear Optical fs-Spectroscopy and Ab Initio Modeling of Polaronic Structures,
New J. Phys 23 (2021) 033016,

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Z. Amber, B. Kirbus, L. M. Eng, M. Rüsing,
Quantifying the Coherent Interaction Length of Second-Harmonic Microscopy in Lithium Niobate Confined Nanostructures,
J. Appl. Phys. 130 (2021) 133102,

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F. Alarslan, L. Vitadello, J. Klein, Q. A. Khan, Ch. Kijatkin, M. Haase, H. Schäfer, M. Imlau, M. Steinhart,
Thin Patterned Lithium Niobate Films by Parallel Additive Capillary Stamping of Aqueous Precursor Solutions,
Advanced Engineering Materials 24 (2022) 2101159,

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E. Beyreuther, J. Ratzenberger, M. Roeper, B. Kirbus, M. Rüsing, M., L. I. Ivleva, L. M. Eng,
Photoconduction of Polar and Nonpolar Cuts of Undoped Sr0.61Ba0.39Nb2O6 Single Crystals,
Crystals 11 (2021) 780;

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O. Buryy, I. Syvorotka, Y. Suhak, U. Yakhnevych, D. Sugak, S. Ubizskii, H. Fritze,
Determination of Optimal Crystallographic Orientations for LiNbO3 and LiTaO3 Bimorph Actuators,
Journal of Sensors and Sensor Systems 10 (2021) 121,

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J. Brockmeier, P. W. Mackwitz, M. Rüsing, C. Eigner, L. Padberg, M. Santandrea, C. Silberhorn, A. Zrenner, G. Berth,
Non-Invasive Visualization of Ferroelectric Domain Structures on the Non-Polar y-Surface of KTiOPO4 via Raman Imaging,
Crystals 11 (2021) 1086,

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F. Hempel, S. Reitzig, M. Rüsing, L. M. Eng,
Broadband Coherent Anti-Stokes Raman Scattering for Crystalline Materials,
Phys. Rev. B 104 (2021) 224308,

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L. Vittadello, C. Kijatkin, J. Klenen, D. Dzikonski, K. Kömpe, C. Meyer, A. Paululat, M.Imlau,
In-Vivo Tracking of Harmonic Nanoparticles: A Study Based on a TIGER Widefield Microscope,
Opt. Mat. Express 11 (2021) 1953,

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J. Golde, M. Rüsing, J. Rix, L. M. Eng, E. Koch,
Quantifying the Refractive Index of Ferroelectric Domain Walls in Periodically Poled LiNbO3 Single Crystals by Polarization-Sensitive Optical Coherence Tomography,
Optics Express 29 (2021) 33615,

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2020

S. Messerschmidt, A. Krampf, L. Vittadello, M. Imlau, T. Norenberg, L. M. Eng, D. Emin,
Small-Polaron Hopping and Low-Temperature (45-225 K) Photo-Induced Transient Absorption in Magnesium-Doped Lithium Niobate,
Crystals 10(9) (2020) 809,

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L. Bollmers, P. Mackwitz, M. Massaro, B. Koppitz, M. Rüsing, L. M. Eng, G. Berth, A. Zrenner, Ch. Eigner, L. Padberg, Ch. Silberhorn, Investigation of periodic poling in LNOI, European Conference on Integrated Optics, 4-6 May 2022, Milan, Italy

S. Ubizskii, L. Vasylechko, V. Sydorchuk, A. Lakhnik, D. Sugak, I.I. Syvorotka, S. Hurskyj, U. Yakhnevych, V. Hreb, Yu. Suhak, H. Fritze, Investigations of LiNb1-xTaxO3 compounds with the stoichiometric composition as well as with the planned deviation from stoichiometry, MSE Congress, 27-29 September 2022, Darmstadt, Germany

M. Rüsing, Z. H. Amber, L. M. Eng, Nonlinear optical microscopy from bulk to thin film ferroelectric – What happens under optical confinement?, 15th International Symposium on Ferroic Domains and Micro to Nanoscopic Structures (ISFD-15), 28-31 August 2022, Kofu, Japan

L. M. Eng, E. Beyreuther, M. Zahn, H. Beccard, E. Singh, Th. Kämpfe , B. Kirbus, Z. Amber, P. Hegarty, M. Rüsing, P. Bednyakov, J. Hlinka, C. Hicks, S. Sanna, Quantifying, Tuning, and Reconfiguring 2D Electron Gases in Ferroic Domain Walls, 15th International Symposium on Ferroic Domains and Micro to Nanoscopic Structures (ISFD-15), 28-31 August 2022, Kofu, Japan

J. Golde, M. Rüsing, R. Kindler, S. Steuer, J. Rix, L. M. Eng, E. Koch, Investigation of ferroelectric domain walls in periodically-poled LiNbO3 single crystals by polarization-sensitive optical coherence tomography,  SPIE Photonics West 2022, 22-27 January 2022, San Francisco, USA

C. Kofahl, J. Uhlendorf, L. Dörrer, B. Muscutt, S. Sanna, Yu. Suhak, H. Fritze, S. Ganschow, G. Borchardt, H. Schmidt, Diffusion of Lithium and Hydrogen in Lithium Niobate and Lithium Tantalate Single Crystals and Solid Solutions, MSE Congress, 27-29 September 2022 Darmstadt,  Germany

Yu. Suhak, A. Kabir, D. Roshchupkin, B. Red’kin, S. Ganschow, H. Fritze, Oxygen Partial Pressure Dependent Electrical Conductivity of LiNb1-xTaxO3 Solid Solutions, SMSI 2021 Conference, 3-6 May 2021, Nürnberg, Germany

L. Vasylechko, V. Sydorchuk, S. Hurskyj, U. Yakhnevych, A. Lakhnik, I.I. Syvorotka, A. Luchechko, O. Buryy, D. Sugak, Ya. Zhydachevskyy, A. Suchocki, Yu. Suhak, H. Fritze, Obtaining and investigation of the LiNbO3, LiNbO3:Mg, LiTaO3 nanopowders doped with Pr ions, SMSI 2021 Conference, 3-6 May 2021, Nürnberg, Germany

Yu. Suhak, B. Jerliu, S. Ganschow, D. Roshchupkin, B. Red'kin, S. Sanna, H. Fritze, Electrical and Electromechanical Properties of Single Crystalline Li(Nb,Ta)O3 Solid Solutions up to 700 °C, SMSI 2021 Conference, 3-6 May 2021, Nürnberg, Germany

Yu. Suhak, B. Jerliu, D. Roshchupkin, B. Red’kin, H. Fritze, High-temperature stability of electrical and electromechanical properties of LiNb0.88Ta0.12O3, SAW-Symposium 2021, 14-15 October 2021, Dresden, Germany

S. Reitzig, F. Hempel, M. Rüsing, L. M. Eng, CARS Domain-Wall Analysis in single-crystalline Lithium Niobate, Nonlinear Optics Topical Meeting – Virtual OSA Meeting, 9-13 August 2021

F. Hempel, S. Reitzig, M. Rüsing, L. M. Eng, Broadband Coherent Anti-Stokes Raman Scattering on Solid State Systems, Nonlinear Optics Topical Meeting – Virtual OSA Meeting, 9-13 August 2021