Temperature dependence of magnetic and thermal properties of chiral HyFe and HyMn close to phase transitions by using the Landau mean field model


Tari O., Yurtseven H.

MATERIALS CHEMISTRY AND PHYSICS, vol.228, pp.118-123, 2019 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 228
  • Publication Date: 2019
  • Doi Number: 10.1016/j.matchemphys.2019.02.078
  • Title of Journal : MATERIALS CHEMISTRY AND PHYSICS
  • Page Numbers: pp.118-123
  • Keywords: Landau model, Magnetic and thermal properties, Chiral HyFe and HyMn, PROMINENT DIELECTRIC ANOMALIES, METAL-ORGANIC FRAMEWORKS, PEROVSKITE, EXPANSION

Abstract

Magnetic and thermal properties of chiral metal formate frameworks (MOFs) of NH2NH3M(HCOO)(3), M = Fe, Mn, namely, HyFe and HyMn are investigated close to phase transitions by using Landau phenomenological model. By expanding the free energy in terms of the order parameter, for magnetic properties the temperature dependence of magnetization and inverse magnetic susceptibility, and for thermal properties the heat capacity and entropy are calculated for chiral HyFe and HyMn close to phase transitions using the experimental data from the literature. Additionally, structural order parameter and inverse susceptibility are predicted from the model, which can be compared with the observed data for chiral HyFe and HyMn.