Specific heat of YFe3(BO3)4, Y0.5Gd0.5Fe3(BO3)4, and GdFe3(BO3)4 |
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| Authors: | A N Vasiliev E A Popova L N Bezmaternykh V L Temerov Z Hiroi |
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| Institution: | (1) Low-Temperature Physics Department, Moscow State University, Moscow, 119992, Russia;(2) Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Krasnoyarsk, 660036, Russia;(3) Institute for Solid-State Physics, University of Tokyo, Kashiwa, Chiba 277-8581, Japan |
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| Abstract: | The specific heat was measured in the range 0.4–300 K in YFe3(BO3)4, Y0.5Gd0.5Fe3(BO3)4, and GdFe3(BO3)4 single crystals. Sharp anomalies were found at temperatures of first-order structural, second-order antiferromagnetic, and
first-order spin-reorientational transitions. A Néel temperature of about 37 K was found to be virtually independent of presence
of rare-earth ions, indicating rather weak coupling of Gd and Fe subsystems. The contribution of the magnetic system to specific
heat was separated through the scaling procedure allowing determination of the magnetic entropy of Fe and Gd subsystems. At
the lowest temperatures, the specific heat in GdFe3(BO3)4 exhibits a Schottky-type anomaly, which is due to Gd3+ eightfold degenerate ground-level splitting by the internal magnetic field of the Fe subsystem of about 7 T.
The text was submitted by the authors in English. |
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