Possible pairing states of the Fe-based superconductors

Yunkyu Bang; Han-Yong Choi

doi:10.1103/PhysRevB.78.134523

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Possible pairing states of the Fe-based superconductors

Yunkyu Bang, Han-Yong Choi

DOI 10.1103/PhysRevB.78.134523 · Physical Review B

T1

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Abstract

We consider the minimal two-band model for the Fe-based superconductors with a phenomenological pairing interaction which mimics short-range antiferromagnetic fluctuations. Two superconducting (SC) gap solutions are found to exist with the model: sign-changing s-wave gap (±s wave) and double d-wave gap states. Both solutions hold the approximate relation ΔhmaxNh≈ΔemaxNe, a generic feature of two-band model with a dominant interband pairing interaction. We carried out the calculations of the SC properties of the both SC states such as the density of states, temperature dependencies of spin-lattice relaxation rate 1/T1, Knight shift, and penetration depth, particularly taking into account of the interband coherence factors. The results are discussed in comparison with the currently available experimental data.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
LaOFeP Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	7	Pressure not reported	unknown
Sm(OF)FeAs Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	50	Pressure not reported	unknown
(BaK)Fe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	38	Pressure not reported	unknown