Almeida-Thouless Line in BiFeO3: Is Bismuth Ferrite a mean field spin glass?
Manoj K. Singh, Ram S. Katiyar, W. Prellier, J.F. Scott
TL;DR
This study investigates the low-temperature magnetic behavior of epitaxial BiFeO3 thin films, revealing a spin-glass transition consistent with the Almeida-Thouless line, indicating mean field spin-glass characteristics.
Contribution
It provides experimental evidence that BiFeO3 exhibits a mean field spin-glass phase, characterized by the Almeida-Thouless line, expanding understanding of its magnetic properties.
Findings
Discrepancy in ZFC and FC magnetization curves below Tf
Tf(H) follows Almeida-Thouless line with Hexp(2/3) dependence
BiFeO3 shows long-range spin-glass behavior
Abstract
Low-temperature magnetic properties of epitaxial BiFeO3 thin films grown on (111)-SrTiO3 substrates have been studied. ZFC and FC magnetization curves show a large discrepency beginning at a characteristic temperature Tf that is dependent on the magnetic-field strengh. Tf(H) varies according to the well known de Aleimda-Thouless line (varies in Hexp(2/3)) suggesting an acentric long rnage spin-glass behavior and mean field system.
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