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Diffusive energy transport in the S=1 Haldane chain compound AgVP2S6 | | A.V. Sologubenko
; S.M. Kazakov
; H.R. Ott
; T. Asano
; Y. Ajiro
; | | Date: |
16 Jul 2003 | | Journal: | Phys. Rev. B 68, 094432 (2003) | | Subject: | Strongly Correlated Electrons | cond-mat.str-el | | Abstract: | We present the results of measurements of the thermal conductivity $kappa$ of the spin S=1 chain compound AgVP_2S_6 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 $kappa_m$ along the chains, superimposed on the dominant phonon contribution $kappa_ph$. At temperatures above about 100 K the energy diffusion constant D_E(T), calculated from the $kappa_m(T)$ data, exhibits similar features as the spin diffusion constant D_S(T), previously measured by NMR. In this regime, the behaviour of both transport parameters is consistent with a diffusion process that is caused by interactions inherent to one-dimensional S=1 spin systems. | | Source: | arXiv, cond-mat/0307383 | | Services: | Forum | Review | PDF | Favorites | |
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