Anisotropy of the upper critical field and critical current in single crystal MgB2

作者：Lyard L^*; Samuely P; Szabo P; Klein T; Marcenat C; Paulius L; Kim KHP; Jung CU; Lee HS; Kang B; Choi S; Lee SI; Marcus J; Blanchard S; Jansen AGM; Welp U; Karapetrov G; Kwok WK

来源：Physical Review B, 2002, 66(18): 180502.

DOI：10.1103/PhysRevB.66.180502

We report on specific-heat, high-magnetic-field transport, and ac-susceptibility measurements on MgB2 single crystals. The upper critical field for magnetic fields perpendicular and parallel to the basal planes is presented in the entire temperature range. A very different temperature dependence has been observed in the two directions, which yields a temperature-dependent anisotropy with Gammasimilar to5 at low temperatures and similar to2 near T-c. A peak effect is observed for mu(0)Hsimilar to2 T parallel to the c axis, and the critical current density presents a sharp maximum for H parallel to the ab plane.

• 出版日期2002-11-1
• 单位中国地震局