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

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).