Calculation of the magnetization and the heat capacity for [NH2 NH3][M(HCOO)3] (M=Fe, Mn) near the phase transitions


YURTSEVEN H. H., Doğan E.

Ferroelectrics, vol.600, no.1, pp.73-87, 2022 (SCI-Expanded) identifier

  • Publication Type: Article / Article
  • Volume: 600 Issue: 1
  • Publication Date: 2022
  • Doi Number: 10.1080/00150193.2022.2115799
  • Journal Name: Ferroelectrics
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Chemical Abstracts Core, Compendex, INSPEC
  • Page Numbers: pp.73-87
  • Keywords: An Ising model, H), heat capacity Cp(T), HyM (M=Fe, Magnetization M(T, Mn), molecular field theory, power–law analysis
  • Van Yüzüncü Yıl University Affiliated: Yes

Abstract

© 2022 Taylor & Francis Group, LLC.Temperature dependence of the magnetization M(T) is calculated for [NH2 NH3][M(HCOO)3] (M=Fe, Mn), namely, HyFe (perovskite and chiral) below (Formula presented.) =12.5 K and, for HyMn (chiral) below and above (Formula presented.) =7.9 K (at 100 Oe) by the molecular field theory (MFT). Close to the magnetic transition temperature ((Formula presented.)), the temperature (at 100 Oe) and the field (at 2K) dependence of the magnetization M(T, H) is analyzed by the power–law formula using the literature data. Magnetic susceptibility is predicted as a function of the field (T = 2K). Also, the temperature dependence of the heat capacity is calculated by the compressible Ising model close to the structural phase transitions in perovskite ((Formula presented.) =347 K) and chiral ((Formula presented.) =336 K) HyFe and the chiral ((Formula presented.) =296 K) HyMn. Our results indicate that HyM (M=Fe, Mn) exhibit weak first order or near second order transitions (magnetic transition and the structural phase transitions).