期刊
EPL
卷 91, 期 6, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1209/0295-5075/91/67002
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资金
- NRF, Korea through Creative Research Initiatives, NRL [M10600000238]
- Basic Science Research [20090083512]
- MOKE
- Seoul RBD [10543]
- US Department of Energy [DE-FG02-86ER45268]
- U.S. Department of Energy (DOE) [DE-FG02-86ER45268] Funding Source: U.S. Department of Energy (DOE)
- Korea Evaluation Institute of Industrial Technology (KEIT) [K0004125] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2006-0052399] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
We report the successful growth of high-quality single crystals of LiFeAs with lateral sizes up to 5 x 5 mm(2) by the Sn-flux method. Electrical resistivity studies reveal that the superconducting onset temperature is 18.2 K with a transition width less than 1.1 K and the ratio of room temperature to residual resistivity is about 24. Bulk superconductivity is supported by perfect shielding in the magnetic susceptibility and a clear jump in the specific heat C-p, resulting in Delta C-p/T approximate to 20.0 mJ/mol K-2. Upper-critical-field slopes of dH(c2)(c)/dT approximate to -1.39 and dH(c2)(ab)/dT approximate to -2.99 T/K near T-c predict zero-temperature upper critical fields of H-c2(c)(0) approximate to 17.2 and H-c2(ab)(0) approximate to 36.9 T and coherence lengths of xi(ab) - 4.4 and xi(c) - 2.0 nm in a single-band model. This result points to a modest superconducting anisotropy about 2.3 in LiFeAs. Copyright (C) EPLA, 2010
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