Magnetothermodynamics of the spin- 1 / 2 Kagome antiferromagnet

In this paper, we use a new hybrid method to compute the thermodynamic behavior of the spin- 1 / 2 Kagome antiferromagnet under the influence of a large external magnetic field. We find a T2 low-temperature behavior and a very low sensitivity of the specific heat to a strong external magnetic field....

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Bibliographic Details
Published inPhysical review letters Vol. 84; no. 13; p. 2953
Main Authors Sindzingre, P, Misguich, G, Lhuillier, C, Bernu, B, Pierre, L, Waldtmann, C, Everts, H
Format Journal Article
LanguageEnglish
Published United States 27.03.2000
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Summary:In this paper, we use a new hybrid method to compute the thermodynamic behavior of the spin- 1 / 2 Kagome antiferromagnet under the influence of a large external magnetic field. We find a T2 low-temperature behavior and a very low sensitivity of the specific heat to a strong external magnetic field. We display clear evidence that this low-temperature magnetothermal effect is associated with the existence of low-lying fluctuating singlets, but also that the whole picture ( T2 behavior of C(v) and the thermally activated spin susceptibility) implies contribution of both nonmagnetic and magnetic excitations. Comparison with experiments is made.
ISSN:1079-7114
DOI:10.1103/PhysRevLett.84.2953