Journal
APPLIED PHYSICS LETTERS
Volume 96, Issue 21, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3435472
Keywords
critical current density (superconductivity); crystal growth from melt; electrical resistivity; high-temperature superconductors; lithium compounds; superconducting critical field
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Funding
- Ministry of Science & Technology (MOST) of Korea [2006-2002165, 2009-0078025]
- Korean Government [KRF-2008-313-C00293]
- National Research Foundation of Korea [2006-2002165, 2009-0078025, 과09A1113, 2008-01242] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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A LiFeAs single crystal with T-c(onset)similar to 19.7 K was grown in a sealed tungsten crucible using the Bridgeman method. The electrical resistivity experiments revealed a ratio of room temperature to residual resistivity of approximately 46 and 18 for the in-plane and out-of plane directions, respectively. The estimated anisotropic resistivity, gamma(rho)=rho(c)/rho(ab), was approximately 3.3 at T-c(onset). The upper critical fields had large H-c2(parallel to ab) and H-c2(parallel to c) values of 83.4 T and 72.5 T, respectively, and an anisotropy ratio is gamma(H)=H-c2(parallel to ab)/H-c2(parallel to c)similar to 1.15. The high upper critical field value and small anisotropy highlight the potential use of LiFeAs in a variety of applications. The calculated critical current density (J(c)) from the M-H loop is approximately 10(3) A/cm(2). (C) 2010 American Institute of Physics. [doi:10.1063/1.3435472]
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