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Doping dependence of heat transport in the iron-arsenide superconductor Ba(Fe1-xCox)2As2: from isotropic to a strongly κ-dependent gap structure --- Physical Review Letters 104,067002 (2010) / arXiv:0907.1276v2

Doping dependence of heat transport in the iron-arsenide superconductor Ba(Fe1-xCox)2As2: from isotropic to a strongly κ-dependent gap structure

M. A. Tanatar1, J.-Ph. Reid2, H. Shakeripour2, X. G. Luo2, N. Doiron-Leyraud2, N. Ni1,3 , S. L. Bud’ko1,3, P. C. Canfield 1,3, R. Prozorov1,3, and Louis Taillefer1,4,*
 

1.Ames Laboratory, Ames, Iowa 50011, USA

2.Departement de physique & RQMP, Universite de Sherbrooke, Sherbrooke, Canada

3.Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA

4.Canadian Institute for Advanced Research, Toronto, Ontario, Canada


Physical Review Letters 104,067002 (2010) / arXiv:0907.1276v2

Abstract

The temperature and magnetic field dependence of the in-plane thermal conductivity of the iron- arsenide superconductor  Ba (Fe1-xCox)2As2 was measured down to about T= 50 mK and up to H=15 T as a function of Co concentration x in the range 0.048 < =  x < = 0.114. At H=0, a negligible residual linear term in in κ/T as T → 0  at all x shows that the superconducting gap has no nodes in the ab plane anywhere in the phase diagram. However, while the slow H dependence of κ(H) at T → 0 in the underdoped regime is consistent with a superconducting gap that is large everywhere on the Fermi surface, the rapid increase in κ(H) observed in the overdoped regime shows that the gap acquires a deep minimum somewhere on the Fermi surface. Outside the antiferromagnetic-orthorhombic phase, the superconducting gap structure has a strongly k-dependent amplitude. 

 

Journal Papers
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Winter
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2010
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Doping dependence of heat transport in the iron-arsenide superconductor Ba(Fe1-xCox)2As2: from isotropic to a strongly κ-dependent gap structure --- Physical Review Letters 104,067002 (2010) / arXiv:0907.1276v2 | Dr. Hamideh Shakeripour

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