Static properties of ferromagnetic quantum chains: numerical results and experimental data on two S = 1/2 systems

K. Kopinga, T. Delica, H. Leschke

Research output: Contribution to journalArticleAcademicpeer-review

3 Citations (Scopus)
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Abstract

New results of a variant of the numerically exact quantum transfer matrix method have been compared with experimental data on the static properties of [C6H11NH3]CuBr3(CHAB), a ferromagnetic system with about 5% easy-plane anisotropy. Above T=3.5 K, the available data on the zero-field heat capacity, the excess heat capacity ¿C=C(B)-C(B=0), and the magnetization are described with an accuracy comparable to the experimental error. Calculations of the spin-spin correlation functions reveal that the good description of the experimental correlation length in CHAB by a classical spin model is largely accidental. The zero-field susceptibility, which can be deduced from these correlation functions, is in fair agreement with the reported experimental data between 4 and 100 K. The method also seems to yield accurate results for the chlorine isomorph, CHAC, a system with about 2% uniaxial anisotropy.
Original languageEnglish
Pages (from-to)5599-5603
Number of pages5
JournalJournal of Applied Physics
Volume67
Issue number9
DOIs
Publication statusPublished - 1990

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