Thermal conductivity of overdoped BaFe1.73Co0.27As2 single crystal: Evidence for nodeless multiple superconducting gaps and interband interactions

J. K. Dong; S. Y. Zhou; T. Y. Guan; X. Qiu; C. Zhang; P. Cheng; L. Fang; H. H. Wen; S. Y. Li

doi:10.1103/PhysRevB.81.094520

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Thermal conductivity of overdoped BaFe1.73Co0.27As2 single crystal: Evidence for nodeless multiple superconducting gaps and interband interactions

J. K. Dong, S. Y. Zhou, T. Y. Guan, X. Qiu, C. Zhang, P. Cheng, L. Fang, H. H. Wen, S. Y. Li

DOI 10.1103/PhysRevB.81.094520 · Physical Review B

T1

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Abstract

The in-plane thermal conductivity κ of overdoped FeAs-based superconductor BaFe1.73Co0.27As2 (Tc=8.1 K) single crystal was measured down to 80 mK. In zero field, the residual linear term κ0/T is negligible, suggesting a nodeless superconducting gap in the ab plane. In magnetic field, κ0/T increases rapidly, very different from that of conventional s-wave superconductors. This anomalous κ0/T(H) may reveal an exotic superconducting gap structure in overdoped BaFe1.73Co0.27As2: the vanishing hole (β) pocket has a much larger gap than the electron (γ and δ) pockets which contain most of the carriers. Such an exotic gap structure is an evidence for superconducting state induced by interband interactions, in which the band with the smaller density of states has a larger gap.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
BaFe1.73Co0.27As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	8.1	Pressure not reported	zero_resistance
BaFe1.73Co0.27As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	8.1	Pressure not reported	onset
Ba1-xKxFe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	30	Pressure not reported	unknown
BaFe1.9Ni0.1As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	20.3	Pressure not reported	unknown
FeSex Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	8.8	Pressure not reported	unknown
BaNi2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	0.7	Pressure not reported	unknown
LaFePO Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	7.4	Pressure not reported	unknown
Ba0.6K0.4Fe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	37	Pressure not reported	unknown
BaFe1.85Co0.15As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	25.5	Pressure not reported	unknown
LaFeAsO1-xFx Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	26	Pressure not reported	unknown