article published yes Pranav Negi author Bin He author Denis Ukolov author Sharona Horta author 03a7e858-01b1-11ec-8b71-99ae6c4a05bc Krishnendu Maji author 76bc9e9f-ba0b-11ee-8184-90edabd17a58 Ning Mao author Nikolai Peshcherenko author Premakumar Yanda author Mengyu Yao author Moinak Dutta author Iñigo Robredo author Mikel Iraola author Maia G. Vergniory author Peter Lemmens author Yang Zhang author Chandra Shekhar author Maria Ibáñez author 43C61214-F248-11E8-B48F-1D18A9856A870000-0001-5013-2843 Claudia Felser author Subhajit Roychowdhury author MaIb department HighTE: The Werner Siemens Laboratory for the High Throughput Discovery of Semiconductors for Waste Heat Recovery project The transverse thermoelectric (Nernst) effect is a powerful probe for studying the electronic and structural properties of materials. In this study, we employ transverse thermoelectric measurements to investigate the ferroelectric distortion in the topological crystalline insulator (TCI) Pb0.60Sn0.40Te, a compound derived from PbTe and SnTe, known for their exceptional thermoelectric performance and distinct ferroelectric properties. By leveraging Nernst measurements, we provide direct evidence of ferroelectric distortion in this TCI, corroborated by Shubnikov–de Haas quantum oscillations that confirm the presence of two topologically nontrivial Fermi pockets. Density functional theory calculations show that these pockets originate from the L and T points in the Brillouin zone of the distorted structure within the TCI phase. Raman spectroscopy further identifies a structural phase transition below 50 K, consistent with the quantum oscillation observations. This observation is further substantiated by temperature-dependent synchrotron X-ray pair distribution function analysis and transmission electron microscopy, which confirm the local off-centering of cations at low temperature. These findings underscore the potential of transverse thermoelectric measurements in unveiling ferroelectric distortions and their role in modulating topological quantum states, opening new directions for research into the synergy between ferroelectricity and topological phases. American Chemical Society2025 eng 0002-7863 1520-5126 40402919 00149330130000110.1021/jacs.5c01700 1472218704-18711 Negi, Pranav, Bin He, Denis Ukolov, Sharona Horta, Krishnendu Maji, Ning Mao, Nikolai Peshcherenko, et al. “Evidence of Ferroelectric Distortions in Topological Crystalline Insulators via Transverse Thermoelectric Measurements.” <i>Journal of the American Chemical Society</i>. American Chemical Society, 2025. <a href="https://doi.org/10.1021/jacs.5c01700">https://doi.org/10.1021/jacs.5c01700</a>. Negi P, He B, Ukolov D, et al. Evidence of ferroelectric distortions in topological crystalline insulators via transverse thermoelectric measurements. <i>Journal of the American Chemical Society</i>. 2025;147(22):18704-18711. doi:<a href="https://doi.org/10.1021/jacs.5c01700">10.1021/jacs.5c01700</a> Negi, Pranav, et al. “Evidence of Ferroelectric Distortions in Topological Crystalline Insulators via Transverse Thermoelectric Measurements.” <i>Journal of the American Chemical Society</i>, vol. 147, no. 22, American Chemical Society, 2025, pp. 18704–11, doi:<a href="https://doi.org/10.1021/jacs.5c01700">10.1021/jacs.5c01700</a>. Negi, P., He, B., Ukolov, D., Horta, S., Maji, K., Mao, N., … Roychowdhury, S. (2025). Evidence of ferroelectric distortions in topological crystalline insulators via transverse thermoelectric measurements. <i>Journal of the American Chemical Society</i>. American Chemical Society. <a href="https://doi.org/10.1021/jacs.5c01700">https://doi.org/10.1021/jacs.5c01700</a> P. Negi <i>et al.</i>, “Evidence of ferroelectric distortions in topological crystalline insulators via transverse thermoelectric measurements,” <i>Journal of the American Chemical Society</i>, vol. 147, no. 22. American Chemical Society, pp. 18704–18711, 2025. P. Negi, B. He, D. Ukolov, S. Horta, K. Maji, N. Mao, N. Peshcherenko, P. Yanda, M. Yao, M. Dutta, I. Robredo, M. Iraola, M.G. Vergniory, P. Lemmens, Y. Zhang, C. Shekhar, M. Ibáñez, C. Felser, S. Roychowdhury, Journal of the American Chemical Society 147 (2025) 18704–18711. Negi P, He B, Ukolov D, Horta S, Maji K, Mao N, Peshcherenko N, Yanda P, Yao M, Dutta M, Robredo I, Iraola M, Vergniory MG, Lemmens P, Zhang Y, Shekhar C, Ibáñez M, Felser C, Roychowdhury S. 2025. Evidence of ferroelectric distortions in topological crystalline insulators via transverse thermoelectric measurements. Journal of the American Chemical Society. 147(22), 18704–18711. 197792025-06-03T07:30:22Z2025-12-30T08:32:19Z