Multigap nodeless superconductivity in FeSe_x: Evidence from quasiparticle heat transport

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J. K. Dong,¹ T. Y. Guan,¹ S. Y. Zhou,¹ X. Qiu,¹ L. Ding,¹ C. Zhang,¹ U. Patel,² Z. L. Xiao,² and S. Y. Li¹
¹Department of Physics, Surface Physics Laboratory (National Key Laboratory), and Laboratory of Advanced Materials, Fudan University, Shanghai 200433, People's Republic of China
²Department of Physics, Northern Illinois University, DeKalb, Illinois 60115, USA

Received 28 June 2009; revised 12 July 2009; published 31 July 2009

Thein-plane thermal conductivity kappa of the iron selenide superconductor FeSe_x(T_c=8.8 K) was measured down to 120 mK and up to14.5 T (3/4H_c₂). In zero field, the residual linear term kappa ₀/T at T --> 0 is only about 16 µW K⁻² cm⁻¹, less than 4%of its normal-state value. Such a small kappa ₀/T does notsupport the existence of nodes in the superconducting gap. Moreimportantly, the field dependence of kappa ₀/T in FeSe_x is verysimilar to that in NbSe₂, a typical multigap s-wave superconductor.We consider our data as strong evidence for multigap nodeless(at least in ab plane) superconductivity in FeSe_x. This kindof superconducting gap structure may be generic for all Fe-basedsuperconductors.

URL:	http://link.aps.org/doi/10.1103/PhysRevB.80.024518
DOI:	10.1103/PhysRevB.80.024518
PACS:	74.25.Fy; 74.25.Op; 74.25.Jb 74.25.Fy Transport properties of superconductors 74.25.Op Mixed state, critical fields, and surface sheath 74.25.Jb Electronic structure of superconductors YEAR: 2009
KEYWORDS:	heat transfer, iron compounds, type II superconductors

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