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Journal article
Superconducting properties of sulfur-doped iron selenide
Physical review. B, Condensed matter and materials physics, v 91(16)
15 Apr 2015
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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 FeSe sub(1-x)S sub(x)(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 T sub(c), anisotropy, upper critical field H sub(c2), and critical current density J sub(c). The upper critical field H sub(c2)(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 [lambda] sub(ab)(T) and specific heat, we show clear evidence for strong coupling two-gap s-wave superconductivity. The temperature dependence of [lambda] sub(ab)(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.
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Details
- Title
- Superconducting properties of sulfur-doped iron selenide
- Creators
- Mahmoud Abdel-Hafiez - Fayoum UniversityYuan-Yuan ZhangZi-Yu Cao - Institute of Solid State PhysicsChun-Gang Duan - East China Normal UniversityG Karapetrov - Drexel UniversityV Pudalov - Moscow Institute of Physics and TechnologyV Vlasenko - P.N. Lebedev Physical Institute of the Russian Academy of SciencesA Sadakov - P.N. Lebedev Physical Institute of the Russian Academy of SciencesD Knyazev - P.N. Lebedev Physical Institute of the Russian Academy of SciencesT Romanova - P.N. Lebedev Physical Institute of the Russian Academy of SciencesD Chareev - Institute of Experimental MineralogyO Volkova - Lomonosov Moscow State UniversityA Vasiliev - Lomonosov Moscow State UniversityXiao-Jia Chen - Center for High Pressure Science and Technology Advanced Research
- Publication Details
- Physical review. B, Condensed matter and materials physics, v 91(16)
- Publisher
- Cold Spring Harbor Press
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Physics
- Web of Science ID
- WOS:000352189000005
- Scopus ID
- 2-s2.0-84929191531
- Other Identifier
- 991019168604104721
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Materials Science, Multidisciplinary
- Physics, Applied
- Physics, Condensed Matter