Phys. Rev. Lett. 100, 137202 (2008) [4 pages]Field-Dependent Thermal Transport in the Haldane Chain Compound NENPReceived 24 December 2007; revised 6 February 2008; published 2 April 2008 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. © 2008 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.100.137202
DOI:
10.1103/PhysRevLett.100.137202
PACS:
75.40.Gb, 66.70.−f, 75.47.−m
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