Temperature Evolution of the Quantum Gap in CsNiCl3

Abstract

Neutron scattering measurements on the one-dimensional gapped S=1 antiferromagnet, CsNiCl3, have shown that the excitation corresponding to the Haldane mass gap Delta at low temperatures persists as a resonant feature to high temperatures. We find that the strong upward renormalisation of the gap excitation, by a factor of three between 5 and 70K, is more than enough to overcome its decreasing lifetime. We find that the gap lifetime is substantially shorter than that predicted by the scaling theory of Damle and Sachdev in its low temperature range of validity. The upward gap renormalisation agrees with the non-linear sigma model at low temperatures and even up to T of order 2Delta provided an upper mass cutoff is included.

Latex, 3 figures, accepted by Pysical Review B

References in corpus (1)

• Spin dynamics and transport in gapped one-dimensional Heisenberg antiferromagnets at nonzero temperatures

Cited by in corpus (13)

• Finite-temperature lineshapes in gapped quantum spin chains
• Finite Temperature Dynamical Correlations in Massive Integrable Quantum Field Theories
• Mesoscopic Phase Coherence in a Quantum Spin Fluid
• Multi-particle States in Spin-1 Chain System CsNiCl3
• The properties of Haldane excitations and multi-particle states in the antiferromagnetic spin-1 chain compound CsNiCl
• Incommensurate dynamic correlations in the quasi-two-dimensional spin liquid BiCu2PO6
• Low-Temperature Dynamical Structure Factor of the Two-Leg Spin-1/2 Heisenberg Ladder
• Finite-Temperature Dynamics and Thermal Intraband Magnon Scattering in Haldane Spin-One Chains
• Evolution of spin excitations in a gapped antiferromagnet from the quantum to the high-temperature limit
• Anomalous thermal decoherence in a quantum magnet measured with neutron spin-echo spectroscopy
• Temperature dependence of single particle excitations in a S=1 chain: exact diagonalization calculations compared to neutron scattering experiments
• Emergent incommensurate correlations in the frustrated ferromagnetic spin-1 chains
• Quantum Magnetism and Superconductivity