Journal
EPL
Volume 94, Issue 5, Pages -Publisher
EPL ASSOCIATION, EUROPEAN PHYSICAL SOCIETY
DOI: 10.1209/0295-5075/94/57008
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Funding
- Basic Science Research Program [2010-0007487, 2010-0006484]
- Mid-career Researcher Program [R01-2008-000-20586-0]
- Nuclear RD Programs
- Ministry of Education, Science and Technology [2006-2002165, 2009-0078025]
- National Research Foundation of Korea [2009-0078025, 2006-2002165, 과06B1110, 2010-0007487] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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The in- and out-of-plane lower critical fields and magnetic penetration depths of LiFeAs were examined. The anisotropy ratio Gamma(Hc1) (0) was smaller than the expected theoretical value, and increased slightly with increasing temperature from 0.6T(c) to T-c. The small degree of anisotropy was numerically confirmed by considering the electron correlation effect. The temperature dependence of the penetration depths followed a power law (similar to T-n) below 0.3T(c), with n>3.5 for both lambda(ab) and lambda(c). Based on theoretical studies of iron-based superconductors, these results suggest that the superconductivity of LiFeAs can be represented by an extended s(+/-)-wave due to the weak impurity scattering effect. And the magnitudes of the two gaps were also evaluated by fitting the superfluid density for both the in-and out-of-plane directions to the two-gap model. The estimated values for the two gaps are consistent with the results from angle-resolved photoemission spectroscopy and specific-heat experiments. Copyright (C) EPLA, 2011
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