Low-temperature thermodynamics of one-dimensional alternating-spin Heisenberg ferromagnets

Details Low-temperature thermodynamics of one-dimensional alternating-spin Heisenberg ferromagnets Low-temperature thermodynamics of one-dimensional alternating-spin Heisenberg ferromagnets

2005-12-24

arxiv.org/abs/cond-mat/0512630v1

Phys. Rev. B 72, 054423 (2005)

Physics

Condensed Matter

Statistical Mechanics

6 pages, 4 figures

Scientific paper

10.1103/PhysRevB.72.054423

Motivated by a novel bimetallic chain compound in which alternating magnetic centers are ferromagnetically coupled, we investigate thermodynamic properties of one-dimensional spin-$(S,s)$ Heisenberg ferromagnets both numerically and analytically. On the one hand, quantum Monte Carlo calculations illuminate the overall thermal behavior. The specific heat may exhibit a double-peaked structure at intermediate temperatures for $S\agt 3s$ in general. On the other hand, a modified spin-wave theory precisely describes the low-temperature properties. Expanding the specific heat and the magnetic susceptibility, we reveal an analogy and a contrast between mixed-spin ferromagnets and ferrimagnets.

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