Superconducting Properties of MgCNi3 Films

Details Superconducting Properties of MgCNi3 Films Superconducting Properties of MgCNi3 Films

2003-05-06

arxiv.org/abs/cond-mat/0305117v1

Physics

Condensed Matter

Superconductivity

submitted to PRB

Scientific paper

10.1103/PhysRevB.68.020501

We report the magnetotransport properties of thin polycrystalline films of the recently discovered non-oxide perovskite superconductor MgCNi3. CNi3 precursor films were deposited onto sapphire substrates and subsequently exposed to Mg vapor at 700 C. We report transition temperatures (Tc) and critical field values (Hc2) of MgCNi3 films ranging in thickness from 7.5 nm to 100 nm. Films thicker than ~40 nm have a Tc ~ 8 K, and an upper critical field Hc2 ~ 14 T, which are both comparable to that of polycrystalline powders. Hall measurements in the normal state give a carrier density, n =-4.2 x 10^22 cm^-3, that is approximately 4 times that reported for bulk samples.

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