Cochran, W. Crystal stability and the theory of ferroelectricity. Adv. Phys. 9, 387–423 (1960).
Müller, K. A. & Burkard, H. SrTiO3: an intrinsic quantum paraelectric below 4 K. Phys. Rev. B 19, 3593 (1979).
Rowley, S. E. et al. Ferroelectric quantum criticality. Nat. Phys. 10, 367–372 (2014).
Shirane, G. & Yamada, Y. Lattice-dynamical study of the 110 K phase transition in SrTiO3. Phys. Rev. 177, 858 (1969).
Weaver, H. E. Dielectric properties of single crystals of SrTiO3 at low temperatures. J. Phys. Chem. Solids 11, 274–277 (1959).
Yamanaka, A. et al. Evidence for competing orderings in strontium titanate from hyper-Raman scattering spectroscopy. Europhys. Lett. 50, 688 (2000).
Salje, E. K. H., Aktas, O., Carpenter, M. A., Laguta, V. V. & Scott, J. F. Domains within domains and walls within walls: evidence for polar domains in cryogenic SrTiO3. Phys. Rev. Lett. 111, 247603 (2013).
Frenkel, Y. et al. Imaging and tuning polarity at SrTiO3 domain walls. Nat. Mater. 16, 1203–1208 (2017).
Fauqué, B. et al. Mesoscopic fluctuating domains in strontium titanate. Phys. Rev. B 106, L140301 (2022).
Müller, K. A., Berlinger, W. & Tosatti, E. Indication for a novel phase in the quantum paraelectric regime of SrTiO3. Zeit. Für Phys. B 84, 277–283 (1991).
Orenstein, G. et al. Observation of polarization density waves in SrTiO3. Nat. Phys. 21, 961–965 (2025).
Guzmán-Verri, G. G., Liang, C. H. & Littlewood, P. B. Lamellar fluctuations melt ferroelectricity. Phys. Rev. Lett. 131, 046801 (2023).
Sakudo, T. & Unoki, H. Dielectric properties of SrTiO3 at low temperatures. Phys. Rev. Lett. 26, 851 (1971).
Neville, R. C., Hoeneisen, B. & Mead, C. A. Permittivity of strontium titanate. J. Appl. Phys. 43, 2124–2131 (1972).
Haeni, J. H. et al. Room-temperature ferroelectricity in strained SrTiO3. Nature 430, 758–761 (2004).
Lee, D. et al. Emergence of room-temperature ferroelectricity at reduced dimensions. Science 349, 1314–1317 (2015).
Basini, M. et al. Terahertz electric-field-driven dynamical multiferroicity in SrTiO3. Nature 628, 534–539 (2024).
Schooley, J. F., Hosler, W. R. & Cohen, M. L. Superconductivity in semiconducting SrTiO3. Phys. Rev. Lett. 12, 474 (1964).
Koonce, C. S., Cohen, M. L., Schooley, J. F., Hosler, W. R. & Pfeiffer, E. R. Superconducting transition temperatures of semiconducting SrTiO3. Phys. Rev. 163, 380 (1967).
Collignon, C., Lin, X., Rischau, C. W., Fauqué, B. & Behnia, K. Metallicity and superconductivity in doped strontium titanate. Annu. Rev. Condens. Matter Phys. 10, 25–44 (2019).
Fleury, P. A., Scott, J. F. & Worlock, J. M. Soft phonon modes and the 110 K phase transition in SrTiO3. Phys. Rev. Lett. 21, 16 (1968).
Jang, H. W. et al. Ferroelectricity in strain-free SrTiO3 thin films. Phys. Rev. Lett. 104, 197601 (2010).
Aschauer, U. & Spaldin, N. A. Competition and cooperation between antiferrodistortive and ferroelectric instabilities in the model perovskite SrTiO3. J. Phys. Condens. Matter 26, 122203 (2014).
Xu, R. et al. Strain-induced room-temperature ferroelectricity in SrTiO3 membranes. Nat. Commun. 11, 3141 (2020).
Salmani-Rezaie, S., Ahadi, K., Strickland, W. M. & Stemmer, S. Order–disorder ferroelectric transition of strained SrTiO3. Phys. Rev. Lett. 125, 087601 (2020).
Mitsui, T. & Westphal, W. B. Dielectric and X-Ray Studies of CaxBa1–xTiO3 and CaxSr1–xTiO3. Phys. Rev. 124, 1354 (1961).
Itoh, M. et al. Ferroelectricity induced by oxygen isotope exchange in strontium titanate perovskite. Phys. Rev. Lett. 82, 3540 (1999).
Li, X. et al. Terahertz field–induced ferroelectricity in quantum paraelectric SrTiO3. Science 364, 1079–1082 (2019).
Nova, T. F., Disa, A. S., Fechner, M. & Cavalleri, A. Metastable ferroelectricity in optically strained SrTiO3. Science 364, 1075–1079 (2019).
Riste, T., Samuelsen, E. J., Otnes, K. T. & Feder, J. Critical behaviour of SrTiO3 near the 105 K phase transition. Solid State Commun. 9, 1455–1458 (1971).
Shapiro, S. M., Axe, J. D., Shirane, G. & Riste, T. Critical neutron scattering in SrTiO3 and KMnF3. Phys. Rev. B 6, 4332 (1972).
Darlington, C. N. W. & O’Connor, D. A. The central mode in the critical scattering of X-rays by SrTiO3. J. Phys. C 9, 3561 (1976).
Tsunekawa, S., Watanabe, H. F. J. & Takei, H. Linear thermal expansion of SrTiO3. Phys. Status Solidi 83, 467–472 (1984).
Neumann, H. B., Poulsen, H. F., Rütt, U., Schneider, J. R. & Zimmermann, M. V. Investigation of structural phase transitions in perovskites using high energy synchrotron radiation. Phase Transit. 55, 17–35 (1995).
Kityk, A. V. et al. Low-frequency superelasticity and nonlinear elastic behavior of SrTiO3 crystals. Phys. Rev. B 61, 946 (2000).
Spence, J. C. H. On the accurate measurement of structure-factor amplitudes and phases by electron diffraction. Found. Cryst. 49, 231–260 (1993).
Zuo, J. M. & Spence, J. C. H. Advanced Transmission Electron Microscopy, Imaging and Diffraction in Nanoscience (Springer, 2017).
Deb, P. et al. Imaging polarity in two dimensional materials by breaking Friedel’s law. Ultramicroscopy 215, 113019 (2020).
Cowley, J. M. Configured detectors for STEM imaging of thin specimens. Ultramicroscopy 49, 4–13 (1993).
Pennycook, T. J. et al. Efficient phase contrast imaging in STEM using a pixelated detector. Part 1: experimental demonstration at atomic resolution. Ultramicroscopy 151, 160–167 (2015).
Tate, M. W. et al. High dynamic range pixel array detector for scanning transmission electron microscopy. Microsc. Microanal. 22, 237–249 (2016).
Tsuda, K., Sano, R. & Tanaka, M. Nanoscale local structures of rhombohedral symmetry in the orthorhombic and tetragonal phases of BaTiO3 studied by convergent-beam electron diffraction. Phys. Rev. B 86, 214106 (2012).
Shao, Y. T. & Zuo, J. M. Lattice-rotation vortex at the charged monoclinic domain boundary in a relaxor ferroelectric crystal. Phys. Rev. Lett. 118, 157601 (2017).
Shao, Y. T. et al. Emergent chirality in a polar meron to skyrmion phase transition. Nat. Commun. 14, 1355 (2023).
Caretta, L. et al. Non-volatile electric-field control of inversion symmetry. Nat. Mater. 22, 207–215 (2023).
Mun, J. et al. Atomic resolution scanning transmission electron microscopy at liquid helium temperatures for quantum materials. Ultramicroscopy 267, 114039 (2024).
Rennich, E. et al. Ultracold cryogenic TEM with liquid helium and high stability. Proc. Natl Acad. Sci. USA 122, e2509736122 (2025).
Dho, J., Kim, W. S. & Hur, N. H. Reentrant spin glass behavior in Cr-doped perovskite manganite. Phys. Rev. Lett. 89, 027202 (2002).
Zhang, Y., Sung, S. H., Clement, C. B., Cheong, S. W. & El Baggari, I. Inverse melting of polar order in chemically substituted BaTiO3. Phys. Rev. Lett. 134, 256801 (2025).
Wang, R., Zhu, Y. & Shapiro, S. M. Electron diffraction studies of phonon and static disorder in SrTiO3. Phys. Rev. B 61, 8814 (2000).
Scott, J. F., Salje, E. K. H. & Carpenter, M. A. Domain wall damping and elastic softening in SrTiO3: evidence for polar twin walls. Phys. Rev. Lett. 109, 187601 (2012).
Pesquera, D., Carpenter, M. A. & Salje, E. K. H. Glasslike dynamics of polar domain walls in cryogenic SrTiO3. Phys. Rev. Lett. 121, 235701 (2018).
Li, Y. L. et al. Phase transitions and domain structures in strained pseudocubic (100) SrTiO3 thin films. Phys. Rev. B 73, 184112 (2006).
Sung, S. H. et al. Liquid helium cryogenic TEM below 1 Å. Preprint at https://arxiv.org/abs/2509.12475 (2025).
El Baggari, I. et al. Nature and evolution of incommensurate charge order in manganites visualized with cryogenic scanning transmission electron microscopy. Proc. Natl Acad. Sci. USA 115, 1445–1450 (2018).
Goodge, B. H., Bianco, E., Schnitzer, N., Zandbergen, H. W. & Kourkoutis, L. F. Atomic-resolution cryo-STEM across continuously variable temperatures. Microsc. Microanal. 26, 439–446 (2020).
Philipp, H. T. et al. Very-high dynamic range, 10,000 frames/second pixel array detector for electron microscopy. Microsc. Microanal. 28, 425–440 (2022).
Madsen, J. & Susi, T. The abTEM code: transmission electron microscopy from first principles. Open Res. Eur. 1, 24 (2021).
