Synthesis, anisotropy, and superconducting properties of LiFeAs single crystal

Yoo Jang Song; Jin Soo Ghim; Byeong Hun Min; Yong Seung Kwon; Myung Hwa Jung; Jong-Soo Rhyee
May 2010
Applied Physics Letters;5/24/2010, Vol. 96 Issue 21, p212508
Academic Journal
A LiFeAs single crystal with Tconset∼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, γρ=ρc/ρab, was approximately 3.3 at Tconset. The upper critical fields had large Hc2∥ab and Hc2∥c values of 83.4 T and 72.5 T, respectively, and an anisotropy ratio is γH=Hc2∥ab/Hc2∥c∼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 (Jc) from the M-H loop is approximately 103 A/cm2


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