Quantum critical dynamics of a S = 1/2 antiferromagnetic Heisenberg chain studied by 13C-NMR spectroscopy

Abstract

We present a 13C-NMR study of the magnetic field driven transition to complete polarization of the S=1/2 antiferromagnetic Heisenberg chain system copper pyrazine dinitrate Cu(C_4H_4N_2)(NO_3)_2 (CuPzN). The static local magnetization as well as the low-frequency spin dynamics, probed via the nuclear spin-lattice relaxation rate 1/T_1, were explored from the low to the high field limit and at temperatures from the quantum regime (k_B T << J) up to the classical regime (k_B T >> J). The experimental data show very good agreement with quantum Monte Carlo calculations over the complete range of parameters investigated. Close to the critical field, as derived from static experiments, a pronounced maximum in 1/T_1 is found which we interpret as the finite-temperature manifestation of a diverging density of zero-energy magnetic excitations at the field-driven quantum critical point.

5 pages, 4 figures

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• Noise in tunneling spin current across coupled quantum spin chains
• Exchange constants in molecule-based magnets derived from density functional methods
• Low frequency spin dynamics in the quantum magnet copper pyrazine dinitrate
• Monovacancy paramagnetism in neutron-irradiated graphite probed by ${}^{13}$C NMR
• Properties of an organic model $S=1$ Haldane chain system