Physics – Condensed Matter – Superconductivity
Scientific paper
2001-10-25
Physics
Condensed Matter
Superconductivity
Submitted to Phys. Rev B
Scientific paper
A large anisotropy in the upper critical field (H$_{C2}$) is observed for MgB$_{2}$ films grown in situ by a pulsed laser deposition process involving growth and annealing of Mg and B multilayers. Measurements of resistivity as a function of temperature and magnetic field yield the estimated zero temperature values of H$_{C2}$ in the range 100 to 130 T and about 10 T, for the field in ab plane and along c axis, respectively, depending on the criterion chosen for the transition temperature. The corresponding anisotropy parameter is thus in the range 9 to 13. The estimated coherence length in ab plane is about 50 \r{A}, whereas that in the c direction is much smaller (\approx 5 \r{A}). No significant magnetoresistance is observed in the normal state.
Biswas Asoka
Greene Richard L.
Ogale S. B.
Shinde S. R.
Venkatesan T.
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