Magnetothermal transport in the spin-1/2 chains of copper pyrazine dinitrate
A. V. Sologubenko, K. Berggold, T. Lorenz, A. Rosch, E. Shimshoni, M. D. Phillips, M. M. Turnbull
Abstract
We present experiments on the thermal transport in the spin-1/2 chain compound copper pyrazine dinitrate Cu(C4 H4 N2)(NO3)2. The heat conductivity shows a surprisingly strong dependence on the applied magnetic field B, characterized at low temperatures by two main features. The first one appearing at low B is a characteristic dip located at muB B ~ kB T, that may arise from Umklapp scattering. The second one is a plateau-like feature in the quantum critical regime, muB |B-Bc| < kB T, where Bc is the saturation field at T=0. The latter feature clearly points towards a momentum and field independent mean free path of the spin excitations, contrary to theoretical expectations.
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