Heat capacity anomaly near magnetic phase transition in GaFeO3

•Heat capacity anomaly in the vicinity of magnetic transition in GaFeO3.•Critical exponent α=-0.2(1) consistent with behavior of a 3-D Heisenberg ferromagnet.•X-ray, Mössbauer and magnetic characterization of single crystal GaFeO3 grown by float zone method. A heat capacity anomaly in the vicinity o...

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Published inJournal of magnetism and magnetic materials Vol. 548; p. 168978
Main Authors Biernacka, Maria, Szafrański, Marek, Rećko, Katarzyna, Olszewski, Wojciech, Satuła, Dariusz, Butkiewicz, Paweł, Szymański, Krzysztof R.
Format Journal Article
LanguageEnglish
Published Amsterdam Elsevier B.V 15.04.2022
Elsevier BV
Subjects
Critical exponents
Critical point
Crystal growth
Crystals
Electric polarization
Ferromagnetism
GaFeO3
Magnetic measurement
Magnetic transitions
Magnetization
Multiferroics
Phase transitions
Single crystals
Specific heat
Specific heat
Magnetization
GaFeO3
Critical exponents
Multiferroics
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Summary:•Heat capacity anomaly in the vicinity of magnetic transition in GaFeO3.•Critical exponent α=-0.2(1) consistent with behavior of a 3-D Heisenberg ferromagnet.•X-ray, Mössbauer and magnetic characterization of single crystal GaFeO3 grown by float zone method. A heat capacity anomaly in the vicinity of magnetic transition was observed in single crystal GaFeO3 for the first time. The crystals grown along the expected electric polarization direction were characterized by X-ray diffraction, Mössbauer and magnetic measurements. Two separate data analyses of heat capacity showed similar results within the experimental accuracy. Critical exponent, α=-0.2(1), and amplitude ratios of positive and negative reduced temperatures near the critical point, A+/A-=1.2(1), are consistent with behavior of a 3-D Heisenberg ferromagnet.
ISSN:0304-8853
1873-4766
DOI:10.1016/j.jmmm.2021.168978