Effects of Two Energy Scales in Weakly Dimerized Antiferromagnetic Quantum Spin Chains

Details Effects of Two Energy Scales in Weakly Dimerized Antiferromagnetic Quantum Spin Chains Effects of Two Energy Scales in Weakly Dimerized Antiferromagnetic Quantum Spin Chains

2007-03-16

arxiv.org/abs/cond-mat/0703431v2

Physical Review Letters 99, 057204 (2007)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figures now identical with finally published version

Scientific paper

10.1103/PhysRevLett.99.057204

By 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, 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 $\Delta$.

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