Thermodynamics of the (1,1/2) Ferrimagnet in Finite Magnetic Fields

Details Thermodynamics of the (1,1/2) Ferrimagnet in Finite Magnetic Fields Thermodynamics of the (1,1/2) Ferrimagnet in Finite Magnetic Fields

1998-05-28

arxiv.org/abs/cond-mat/9805376v1

Physics

Condensed Matter

5 pages, 7 eps figures, uses RevTeX, submitted to PRB

Scientific paper

10.1103/PhysRevB.58.R5908

We investigate the specific heat and magnetisation of a ferrimagnet with gS=1 and S=1/2 spins in a finite magnetic field using the transfer matrix DMRG down to T=0.025J. Ferromagnetic gapless and antiferromagnetic gapped excitations for H=0 lead to rich thermodynamics for H > 0. While the specific heat is characterized by a generic double peak structure, magnetisation reveals two critical fields, Hc1=1.76(1) and Hc2=3.00(1) with square-root behaviour in the T=0 magnetisation. Simple analytical arguments allow to understand these experimentally accessible findings.

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