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

By L. Lyard, P. Samuely, P. Szabó, T. Klein, C. Marcenat, L. Paulius, K. H. Kim, C. Jung, Hangil Lee, B. Kang and 8 more. 2002

135 citations recorded by the source corpus.

We report on specific-heat, high-magnetic-field transport, and ac-susceptibility measurements on ${\mathrm{MgB}}_{2}$ 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 $\ensuremath{\Gamma}\ensuremath{\sim}5$ at low temperatures and $\ensuremath{\sim}2$ near ${T}_{c}.$ A peak effect is observed for ${\ensuremath{\mu}}_{0}H\ensuremath{\sim}2\mathrm{T}$ parallel to the c axis, and the critical current density presents a sharp maximum for H parallel to the $\mathrm{ab}$ plane.

Subfields: Condensed Matter Physics, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/cc44d9bd3596b7a68a06f47524b527d5d7e8be8e