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

K. Maisinger·U. Schollwoeck·S. Brehmer·H. J. Mikeska·S. Yamamoto
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Abstract

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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K. Maisinger, U. Schollwoeck, S. Brehmer, H. J. Mikeska, S. Yamamoto. 1998-05-28. Thermodynamics of the (1,1/2) Ferrimagnet in Finite Magnetic Fields. https://doi.org/10.1103/physrevb.58.r5908

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