Magnetocaloric effect in quantum spin-s chains

Details Magnetocaloric effect in quantum spin-s chains Magnetocaloric effect in quantum spin-s chains

2009-07-21

arxiv.org/abs/0907.3736v1

Condensed Matter Physics 12 (2009) 399-410

Physics

Condensed Matter

Strongly Correlated Electrons

11 pages including 6 figures, to appear in Condensed Matter Physics (Lviv)

Scientific paper

10.5488/CMP.12.3.399

We compute the entropy of antiferromagnetic quantum spin-s chains in an external magnetic field using exact diagonalization and Quantum Monte Carlo simulations. The magnetocaloric effect, i.e., temperature variations during adiabatic field changes, can be derived from the isentropes. First, we focus on the example of the spin-s=1 chain and show that one can cool by closing the Haldane gap with a magnetic field. We then move to quantum spin-s chains and demonstrate linear scaling with $s$ close to the saturation field. In passing, we propose a new method to compute many low-lying excited states using the Lanczos recursion.

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