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arXiv:cond-mat/9601025 · Physical review. B, Condensed matter

Susceptibility and low-temperature thermodynamics of spin-½ Heisenberg ladders

Beat Frischmuth, Beat Ammon, Matthias Troyer

Published Aug 1, 1996• 82 citations
arXivHTMLPDF

Abstract

The temperature dependence of the uniform susceptibility and the ground-state energy of antiferromagnetic Heisenberg ladders with up to six legs has been calculated, using the Monte Carlo loop algorithm. The susceptibilities of even-leg ladders show spin gaps while those of odd-leg ladders remain finite in the zero-temperature limit. For small ratios of intra- to interleg couplings, odd-leg ladders can be mapped at low temperatures to single chains. For equal couplings, the logarithmic corrections at low temperatures increase markedly with the number of legs.

DOI
10.1103/physrevb.54.r3714

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