Field-dependent thermal transport in the Haldane chain compound NENP

Details Field-dependent thermal transport in the Haldane chain compound NENP Field-dependent thermal transport in the Haldane chain compound NENP

2007-12-24

arxiv.org/abs/0712.3991v2

Phys. Rev. Lett. 100, 137202 (2008)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.100.137202

We present a study of the magnetic field-dependent thermal transport in the spin S=1 chain material Ni(C2H8N2)2NO2(ClO4) (NENP). The measured thermal conductivity is found to be very sensitive to the field-induced changes in the spin excitation spectrum. The magnetic contribution to the total heat conductivity is analyzed in terms of a quasiparticle model, and we obtain a temperature and momentum independent mean free path. This implies that the motion of quasiparticles is effectively three dimensional despite the tiny interchain coupling.

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