Evidence of Substrate-Induced Ferroelectric Phase Transition in SrTiO₃ by Means of Thermal Measurements

S. Davitadze Department of Physics, Lomonosov Moscow State University, Moscow, 119991, Russia

I. Shnaidshtein Department of Physics, Lomonosov Moscow State University, Moscow, 119991, Russia

A. Fadeev Department of Physics, Lomonosov Moscow State University, Moscow, 119991, Russia

B. Strukov Department of Physics, Lomonosov Moscow State University, Moscow, 119991, Russia

S. Shulman Department of Physics, Lomonosov Moscow State University, Moscow, 119991, Russia

B. Noheda Zernike Institute for Advanced Materials, University of Groningen, 9747, AG, Groningen, The Netherlands

A. H.G. Vlooswijk Zernike Institute for Advanced Materials, University of Groningen, 9747, AG, Groningen, The Netherlands

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Abstract

The paper reports the results of the temperature dependence measurements of the specific heat for a SrTiO₃ thin (104 nm) film deposited on a DyScO₃ substrate. Two anomalies of the specific heat have been observed. They can be associated with the strain-induced ferroelectric phase transition (at 304K) and the shifted antiferrodistortive structural phase transition (at 173 K).

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Acknowledgments

The authors would like to express their sincere gratitude to Professor Mario Maglione for his promotional suggestion to run this work. Authors express their gratitude to Russian Foundation for Basic Research for financial support (project no. 08-02-01010) and the Dutch Foundation for Fundamental Research on Matter (FOM) and the Netherlands Organization for Scientific Research (NOW-Vidi Grant).

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Evidence of Substrate-Induced Ferroelectric Phase Transition in SrTiO₃ by Means of Thermal Measurements

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Evidence of Substrate-Induced Ferroelectric Phase Transition in SrTiO₃ by Means of Thermal Measurements