Physics – Condensed Matter – Superconductivity
Scientific paper
2001-04-28
Supercond. Sci. Technol. 14 No 6 (June 2001) 315-319
Physics
Condensed Matter
Superconductivity
5 pages Acrobat 3.02 pdf
Scientific paper
10.1088/0953-2048/14/6/304
An important predicted, but so far uncharacterized, property of the new superconductor MgB2 is electronic anisotropy arising from its layered crystal structure. Here we report on three c-axis oriented thin films, showing that the upper critical field anisotropy ratio Hc2par/Hc2perp is 1.8 to 2.0, the ratio increasing with higher resistivity. Measurements of the magnetic field-temperature phase diagram show that flux pinning disappears at H* ~ 0.8Hc2perp(T) in untextured samples. Hc2par(0) is strongly enhanced by alloying to 39 T for the highest resistivity film, more than twice that seen in bulk samples.
Babcock S. E.
Belenky L.
Bu S. D.
Cai X. Y.
Choi Jae-Hoon
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