Geometrical description of the state space in spin crossover solids with high-spin low-spin degree of freedom

ERDEM R.

Physica A: Statistical Mechanics and its Applications, cilt.598, 2022 (SCI-Expanded) identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 598
  • Basım Tarihi: 2022
  • Doi Numarası: 10.1016/j.physa.2022.127335
  • Dergi Adı: Physica A: Statistical Mechanics and its Applications
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aerospace Database, Artic & Antarctic Regions, INSPEC, Public Affairs Index, zbMATH, Civil Engineering Abstracts
  • Anahtar Kelimeler: Ricci scalar, Spin crossover transition, Thermodynamic geometry
  • Akdeniz Üniversitesi Adresli: Evet

Özet

© 2022 Elsevier B.V.Ising-like model of the spin-crossover solids is studied making use of thermodynamic geometry in the Ruppeiner formalism. A thermal metric tensor (Gij) and corresponding thermodynamic curvature or Ricci scalar (R) are computed for a 2D “magnatization” vs “temperature” state space. The two metric components, namely G12 and G22, have the finite extremum above the critical temperature in the high-spin state. On the other hand, R abruptly jumps between the R>0 and R<0 regions along the first-order high-spin/low-spin transition line while the curvature jump disappears when the critical point (C) is reached. It exhibits smooth changes beyond C along the R=0 line. A different vanishing curvature line with R=0 is also observed in the high-spin state regime in the geometric phase diagram.