1997/10/28 by Shoji Yamamoto, Takahiro Fukui · 2 citations
Physics and Astronomy · #Antiferromagnetism #Condensed matter physics #Ferrimagnetism #Ferromagnetism #Heisenberg model #Ising model #Magnetic field #Magnetic susceptibility #Magnetization #Materials science #Physics #Physics of Superconductivity and Magnetism #Quantum many-body systems #Quantum mechanics #Specific heat #Spin (aerodynamics) #Spins #Theoretical and Computational Physics #Thermodynamics #cond-mat.stat-mech
paper · pdf · doi:10.1103/physrevb.57.r14008
4 pages, 4 Postscript figures, RevTex
arxiv created 1997/10/28 · openalex publication_date 1998/06/01 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We study thermodynamic properties of the one-dimensional Heisenberg ferrimagnet with antiferromagnetically exchange-coupled spins of two kinds. The specific heat and the magnetic susceptibility are calculated employing a modified spin-wave theory as well as a quantum Monte Carlo method. The specific heat is proportional to T1/2 at low enough temperatures but shows a Schottky-like peak at mid temperatures. The susceptibility diverges as T^\ensuremath-2. We reveal that at low temperatures the model acts as a ferromagnet, while at mid temperatures it behaves like a gapped antiferromagnet.