Magnetothermal transport in the spin-1/2 chains of copper pyrazine dinitrate
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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