Anomalous thermal decoherence in a quantum magnet measured with neutron spin-echo spectroscopy

Abstract

The effect of temperature dependent asymmetric line broadening is investigated in Cu(NO${}_3$)${}_2\cdot$2.5D${}_2$O, a model material for a 1-D bond alternating Heisenberg chain, using the high resolution neutron-resonance spin-echo (NRSE) technique. Inelastic neutron scattering experiments on dispersive excitations including phase sensitive measurements demonstrate the potential of NRSE to resolve line shapes, which are non-Lorentzian, opening up a new and hitherto unexplored class of experiments for the NRSE method beyond standard line width measurements. The particular advantage of NRSE is its direct access to the correlations in the time domain without convolution with the resolution function of the background spectrometer. This novel application of NRSE is very promising and establishes a basis for further experiments on different systems, since the results for Cu(NO${}_3$)${}_2\cdot$2.5D${}_2$O are applicable to a broad range of quantum systems.

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• Witnessing Entanglement and Quantum Correlations in Condensed Matter: A Review
• Magnetic excitations in the S = 1/2 antiferromagnetic-ferromagnetic chain compound BaCu2V2O8 at zero and finite temperature
• Finite temperature dynamical correlations for the dimerized spin-1/2 chain
• Time-dependent correlations in quantum magnets at finite temperature
• Evidence for strong correlations at finite temperatures in the dimerized magnet Na${}_2$Cu${}_2$TeO${}_6$