Thermal conductivity in the doped two-leg ladder antiferromagnet Sr_14-x Ca_x Cu_24 O_41

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Title:	Thermal conductivity in the doped two-leg ladder antiferromagnet Sr_14-x Ca_x Cu_24 O_41
Authors:	Qin, Jihong;Feng, Shiping;Yuan, Feng;Chen, Wei-yeu
Contributors:	淡江大學物理學系
Date:	2005-02
Issue Date:	2013-07-09 15:22:47 (UTC+8)
Publisher:	Amsterdam: Elsevier BV * North-Holland
Abstract:	Within the t-J model, the heat transport of the doped two-leg ladder material Sr14-xCaxCu24O41 is studied in the doped regime where superconductivity appears under pressure in low temperatures. The energy dependence of the thermal conductivity κc(ω) shows a low-energy peak, while the temperature dependence of the thermal conductivity κc(T) is characterized by a broad band. In particular, κc(T) increases monotonously with increasing temperature at low temperatures T<0.05J, and is weakly temperature-dependent in the temperature range 0.05J<T<0.1J, then decreases for temperatures T>0.1J, in qualitative agreement with experiments. Our result also shows that although both dressed holons and spinons are responsible for the thermal conductivity, the contribution from the dressed spinons dominates the heat transport of Sr14-xCaxCu24O41.
Relation:	Physics Letters. Section A: General, Atomic and Solid State Physics 335(5-6), pp.477-485
DOI:	10.1016/j.physleta.2004.12.051
Appears in Collections:	[Graduate Institute & Department of Physics] Journal Article

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