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(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.

4 pages, 4 figures

References in corpus (1)

• Thermal transport of the XXZ chain in a magnetic field

Cited by in corpus (4)

• Field-dependent thermal transport in the Haldane chain compound NENP
• Lower bounds for the conductivities of correlated quantum systems
• Quantum critical dynamics of a S = 1/2 antiferromagnetic Heisenberg chain studied by 13C-NMR spectroscopy
• Ballistic magneto-thermal transport in a Heisenberg spin chain at low temperatures