Thermodynamic properties of the one-dimensional Ising model with magnetoelastic interaction

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:507

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: Ising model;    Magnetoelastic coupling;    Thermodynamics of magnets;    Thermodynamic response functions;    Magnetostriction;   

DOI  :  10.1016/j.jmmm.2020.166825

来源: Elsevier

【 摘 要 】

The Ising one-dimensional (1D) chain with spin S = 1/2 and magnetoelastic interaction is studied with the lattice contribution included in the form of elastic interaction and thermal vibrations simultaneously taken into account. The magnetic energy term and the elastic (static) energy term based on the Morse potential are calculated exactly. The vibrational energy is calculated in the Debye approximation, in which the anharmonicity is introduced by the Gruneisen parameter. The total Gibbs potential, including both the magnetic field, as well as the external force term, is constructed and from its minimum the equation of state is derived. From the Gibbs energy all the thermodynamic properties are calculated in a self-consistent manner. The comprehensive numerical calculations are performed in a full temperature range, i.e., from zero temperature up to the vicinity of melting. In particular, a role of magneto-elastic coupling is emphasized and examined. The numerical results are illustrated in figures and discussed.

【 授权许可】

Free