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Title: Superconducting properties of sulfur-doped iron selenide
Authors: Abdel-Hafiez, M.
Zhang, Y. -Y.
Cao, Z. -Y.
Duan, C. -G.
Karapetrov, G.
Pudalov, V. M.
Vlasenko, V. A.
Sadakov, A. V.
Knyazev, D. A.
Romanova, T. A.
Chareev, D. A.
Volkova, O. S.
Vasiliev, A. N.
Chen, X. -J.
Issue Date: 2015
Publisher: American Physical Society
Citation: Superconducting properties of sulfur-doped iron selenide / M. Abdel-Hafiez, Y. -Y. Zhang, Z. -Y. Cao, et al. — DOI 10.1103/PhysRevB.91.165109 // Physical Review B - Condensed Matter and Materials Physics. — 2015. — Vol. 91. — Iss. 16. — 165109.
Abstract: The recent discovery of high-temperature superconductivity in single-layer iron selenide has generated significant experimental interest for optimizing the superconducting properties of iron-based superconductors through the lattice modification. For simulating the similar effect by changing the chemical composition due to S doping, we investigate the superconducting properties of high-quality single crystals of FeSe1-xSx (x=0, 0.04, 0.09, and 0.11) using magnetization, resistivity, the London penetration depth, and low temperature specific heat measurements. We show that the introduction of S to FeSe enhances the superconducting transition temperature Tc, anisotropy, upper critical field Hc2, and critical current density Jc. The upper critical field Hc2(T) and its anisotropy are strongly temperature dependent, indicating a multiband superconductivity in this system. Through the measurements and analysis of the London penetration depth λab(T) and specific heat, we show clear evidence for strong coupling two-gap s-wave superconductivity. The temperature dependence of λab(T) calculated from the lower critical field and electronic specific heat can be well described by using a two-band model with s-wave-like gaps. We find that a d wave and single-gap BCS theory under the weak-coupling approach cannot describe our experiments. The change of specific heat induced by the magnetic field can be understood only in terms of multiband superconductivity. © 2015 American Physical Society.
Access: info:eu-repo/semantics/openAccess
SCOPUS ID: 84929191531
PURE ID: 343730
ISSN: 10980121
DOI: 10.1103/PhysRevB.91.165109
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