Enhancement of thermal conductivity in the superconducting state of Co-doped BaFe2As2

被引：1

作者：

Nakajima, Y. ^{[1
]}

Kurosaki, Y. ^{[1
]}

Tamegai, T. ^{[1
]}

机构：

[1] Univ Tokyo, Dept Appl Phys, Tokyo 113, Japan

来源：

26TH INTERNATIONAL CONFERENCE ON LOW TEMPERATURE PHYSICS (LT26), PTS 1-5 | 2012年 / 400卷

关键词：

D O I：

10.1088/1742-6596/400/2/022080

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We report the thermal conductivity in Co-doped BaFe2As2 at under-, optimal-, and over-doping levels. We find the enhancement of the thermal conductivity divided by temperature kappa/T in the superconducting state at all doping levels, which is strikingly similar to those observed in the strongly correlated superconductors, such as high-T-c cuprates and heavy fermion systems. We also find that the enhancement of kappa/T is strongly suppressed by applying magnetic fields. The analysis based on the vortex-scattering model unveils that the enhancement of kappa/T originates from the steep increase of the quasi-particle mean-free path possibly due to the reduction of the inelastic scattering in the superconducting state. Strong enhancement of kappa(e)/T of over-doping level may suggest that quasiparticle population still remains even at low temperatures.

引用

页数：4

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