Thermodynamic model of a solid with RKKY interaction and magnetoelastic coupling

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:452

Article

Balcerzak, T.¹  Szalowski, K.¹  Jascur, M.² 

[1] Univ Lodz, Fac Phys & Appl Informat, Dept Solid State Phys, Ulica Pomorska 149-153, PL-90236 Lodz, Poland

[2] Safarik Univ, Fac Sci, Dept Theoret Phys & Astrophys, Pk Angelinum 9, Kosice 04154, Slovakia

关键词: Magnetoelastic coupling;    Ferromagnetism;    Antiferromagnetism;    Thermodynamics of magnets;    RKKY interaction;    Magnetization;    Magnetostriction;    Negative thermal expansion;    Compressibility;    Susceptibility;   

DOI  :  10.1016/j.jmmm.2017.12.088

来源: Elsevier

【 摘 要 】

Thermodynamic description of a model system with magnetoelastic coupling is presented. The elastic, vibrational, electronic and magnetic energy contributions are taken into account. The long-range RKKY interaction is considered together with the nearest-neighbour direct exchange. The generalized Gibbs potential and the set of equations of state are derived, from which all thermodynamic functions are self-consistently obtained. Thermodynamic properties are calculated numerically for FCC structure for arbitrary external pressure, magnetic field and temperature, and widely discussed. In particular, for some parameters of interaction potential and electron concentration corresponding to antiferromagnetic phase, the existence of negative thermal expansion coefficient is predicted. (C) 2017 Elsevier B.V. All rights reserved.

【 授权许可】

Free