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Specific heat studies of the phase transitions in multiferroic Sr1−uBauMn1−yTiyO3 system (0≤u≤0.65, 0≤y≤0.1)

J. Wieckowski, A. Szewczyk*, M. U. Gutowska, and B. Dabrowski

  • *Contact author: szewc@ifpan.edu.pl
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Phys. Rev. B 111, 224419 – Published 20 June, 2025

DOI: https://doi.org/10.1103/hn32-kxms

Abstract

Specific heat studies of the Sr1−uBauMn1−yTiyO3 system polycrystalline samples performed by the relaxation and DSC methods over the temperature range 2–450 K are reported. Anomalies accompanying the antiferromagnetic-paramagnetic and ferroelectric-paraelectric phase transitions were measured. The system studied is a promising multiferroic material of the first type, in which a strong coupling between the magnetic and electric systems, related probably to the fact that the same Mn4+ ions are responsible for the two orderings, appears. Analysis of the specific heat anomaly at the magnetic transition was done using the advanced theory of the continuous transitions, in which the presence of higher order terms in the free energy is considered, and the parameters of the critical behavior of the system were estimated. The shape of this anomaly suggests that arguably, despite earlier predictions, the transition loses the continuous character and becomes the first-order process for the Ti-containing samples. For majority of the compositions, the anomaly accompanying the first-order high-temperature ferroelectric transition was found to be smeared and not well pronounced, which was tentatively ascribed to a wide temperature range of coexistence of the para- and ferroelectric phases and a small difference between entropies of both phases.

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Phys. Rev. B 111, 224419– Published 20 June, 2025
  • Received 6 August 2024
  • Revised 7 May 2025
  • Accepted 3 June 2025
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

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