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arXiv · 0704.3041

Magnetization and specific heat of TbFe3(BO3)4: Experiment and crystal field calculations

E. A. Popova·D. V. Volkov·A. N. Vasiliev·A. A. Demidov·N. P. Kolmakova·I. A. Gudim·L. N. Bezmaternykh·N. Tristan·Yu. Skourski·B. Büchner·C. Hess·R. Klingeler
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Abstract

We have studied the thermodynamic properties of single-crystalline TbFe3(BO3)4. Magnetization measurements have been carried out as a function of magnetic field (up to 50 T) and temperature up to 350K with the magnetic field both parallel and perpendicular to the trigonal c-axis of the crystal. The specific heat has been measured in the temperature range 2-300K with a magnetic field up to 9 T applied parallel to the c-axis. The data indicate a structural phase transition at 192 K and antiferromagnetic spin ordering at 40 K. A Schottky anomaly is present in the specific heat data around 20 K, arising due to two low-lying energy levels of the Tb3+ ions being split by f-d coupling. Below TN magnetic fields parallel to the c-axis drive a spin-flop phase transition, which is associated with a large magnetization jump. The highly anisotropic character of the magnetic susceptibility is ascribed mainly to the Ising-like behavior of the Tb3+ ions in the trigonal crystal field. We describe our results in the framework of an unified approach which is based on mean-field approximation and crystal-field calculations.

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E. A. Popova, D. V. Volkov, A. N. Vasiliev, A. A. Demidov, N. P. Kolmakova, I. A. Gudim, L. N. Bezmaternykh, N. Tristan, Yu. Skourski, B. Büchner, C. Hess, R. Klingeler. 2007-04-23. Magnetization and specific heat of TbFe3(BO3)4: Experiment and crystal field calculations. https://doi.org/10.1103/physrevb.75.224413

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