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

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

2006-12-19

arxiv.org/abs/cond-mat/0612486v2

Phys. Rev. Lett. 98, 107201 (2007)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.98.107201

We present experiments on the thermal transport in the spin-1/2 chain compound copper pyrazine dinitrate Cu(C_4 H_4 N_2)(NO_3)_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 mu_B B ~ k_B T, that may arise from Umklapp scattering. The second one is a plateau-like feature in the quantum critical regime, mu_B |B-B_c| < k_B T, where B_c 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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