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29 March 2024
 
  » arxiv » cond-mat/0703431

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Effects of Two Energy Scales in Weakly Dimerized Antiferromagnetic Quantum Spin Chains
A. Brühl ; B. Wolf ; V. Pashchenko ; M. Anton ; C. Gross ; W. Assmus ; R. Valenti ; S. Glocke ; A. Klümper ; T. Saha-Dasgupta ; B. Rahaman ; M. Lang ;
Date 16 Mar 2007
Subject Strongly Correlated Electrons
AbstractBy means of thermal expansion and specific heat measurements on the high-pressure phase of (VO)$_2$P$_2$O$_7$, the effects of two energy scales of the weakly dimerized antiferromagnetic $S$ = 1/2 Heisenberg chain are explored. The low energy scale, given by the spin gap $Delta$, is found to manifest itself in a pronounced thermal expansion anomaly. A quantitative analysis, employing T-DMRG calculations, shows that this feature originates from changes in the magnetic entropy with respect to $Delta$, $partial S^{m}/ partial Delta$. This term, which is inaccessible by specific heat, is visible only in the weak-dimerization limit where it reflects peculiarities of the excitation spectrum and its sensitivity to variations in $Delta$.
Source arXiv, cond-mat/0703431
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