Diffusive energy transport in theS=1Haldane chain compoundAgVP2S6

2003/07/16 by A. V. Sologubenko, С. М. Казаков, S. M. Kazakov +5 · 1 citation
Physics and Astronomy · #Advanced Condensed Matter Physics #Physics of Superconductivity and Magnetism #Theoretical and Computational Physics #cond-mat.str-el

paper · pdf · doi:10.1103/physrevb.68.094432

published as Phys. Rev. B 68, 094432 (2003) · 6 pages, 4 figures

arxiv created 2003/07/16 · openalex publication_date 2003/09/29 · arxiv updated 2009/12/01 · openalex created_date 2020/05/13 · openalex updated_date 2026/07/28

Abstract

We present the results of measurements of the thermal conductivity \ensuremathκ of the spin S=1 chain compound AgVP₂S₆ in the temperature range between 2 and 300 K and with the heat flow directed either along or perpendicular to the chain direction. The analysis of the anisotropy of the heat transport allowed for the identification of a small but non-negligible magnon contribution \ensuremathκ_m along the chains, superimposed on the dominant phonon contribution \ensuremathκ_ph. At temperatures above about 100 K the energy diffusion constant D_E(T), calculated from the \ensuremathκ_m(T) data, exhibits similar features as the spin diffusion constant D_S(T), previously measured by NMR. In this regime, the behavior of both transport parameters is consistent with a diffusion process that is caused by interactions inherent to one-dimensional S=1 spin systems.

Citations

• Thermal transport in one-dimensional spin gap systems
• O<mml:mprescripts/>17NMR Study ofq<mml:mspace/>=<mml:mspace/>0Spin Excitations in a Nearly IdealS<mml:mspace/>=<mml:mspace/>121D Heisenberg Antiferromagnet,Sr2CuO3, up to 800 K
• Spin dynamics and transport in gapped one-dimensional Heisenberg antiferromagnets at nonzero temperatures
• Continuum dynamics of the 1-D Heisenberg antiferromagnet: Identification with the O(3) nonlinear sigma model

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• Thermal Conductivity via Magnetic Excitations in Spin-Chain Materials