High-field phase-diagram of Fe arsenide superconductors

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	High-field phase-diagram of Fe arsenide superconductors
	Jo, YJ ; Jaroszynski, J ; Yamamoto, A ; Gurevich, A ; Riggs, SC ; Boebinger, GS ; Larbalestier, D ; Wen, HH ; Zhigadlo, ND ; Katrych, S ; Bukowski, Z ; Karpinski, J ; Liu, RH ; Chen, H ; Chen, XH ; Balicas, L
刊名	PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS
	2009
卷号	469 期号:9-12 页码:566
关键词	CRITICAL-CURRENT-DENSITY FLUX-PINNING MECHANISMS II SUPERCONDUCTORS HARD SUPERCONDUCTORS MAGNETIC ORDER FERMI-SURFACE 43 K BA0.6K0.4FE2AS2 LAO1-XFXFEAS INSTABILITY
ISSN号	0921-4534
通讯作者	Balicas, L: Florida State Univ, Natl High Magnet Field Lab, Tallahassee, FL 32310 USA.
中文摘要	Here, we report an overview of the phase-diagram of single-layered and double-layered Fe arsenide superconductors at high magnetic fields. our systematic magneto-transport measurements of polycrystalline SmFeAsO1-xFx at different doping levels confirm the upward curvature of the upper critical magnetic field H-c2(T) as a function of temperature T defining the phase boundary between the superconducting and metallic states for crystallites with the ab planes oriented nearly perpendicular to the magnetic field. We further show from measurements on single-crystals that this feature, which was interpreted in terms of the existence of two superconducting gaps, is ubiquitous among both series of single- and double-layered compounds. In all compounds explored by us the zero temperature upper critical field H-c2(0), estimated either through the Ginzburg-Landau or the Werthamer-Helfand-Hohenberg single gap theories. strongly surpasses the weak-coupling Pauli paramagnetic limiting field. This clearly indicates the strong-coupling nature of the superconducting state and the importance of magnetic correlations for these materials. Our measurements indicate that the superconducting anisotropy, as estimated through the ratio of the effective masses gamma = (m(c)/m(ab))(1/2) for carriers moving along the c-axis and the ab-planes, respectively, is relatively modest as compared to the high-T-c cuprates, but it is temperature, field and even doping dependent. Finally, our preliminary estimations of the irreversibility field H-m(T), separating the vortex-solid from the vortex-liquid phase in the single-layered compounds, indicates that it is well described by the melting of a vortex lattice in a moderately anisotropic uniaxial superconductor. (C) 2009 Elsevier B.V. All rights reserved.
收录类别	SCI
资助信息	NSF [NSF-DMR-0084173]; NHMFL in-house research program; NHMFL-Schuller program
语种	英语
公开日期	2013-09-17
内容类型	期刊论文
源URL	[http://ir.iphy.ac.cn/handle/311004/39304]
专题	物理研究所_物理所公开发表论文_物理所公开发表论文_期刊论文
推荐引用方式 GB/T 7714	Jo, YJ,Jaroszynski, J,Yamamoto, A,et al. High-field phase-diagram of Fe arsenide superconductors[J]. PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS,2009,469(9-12):566.
APA	Jo, YJ.,Jaroszynski, J.,Yamamoto, A.,Gurevich, A.,Riggs, SC.,...&Balicas, L.(2009).High-field phase-diagram of Fe arsenide superconductors.PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS,469(9-12),566.
MLA	Jo, YJ,et al."High-field phase-diagram of Fe arsenide superconductors".PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS 469.9-12(2009):566.