Superconducting Properties of MgCNi3 Films

Abstract

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.

submitted to PRB

References in corpus (8)

• Evidence for incommensurate spin fluctuations in Sr_2RuO_4
• Superconductivity Near Ferromagnetism in MgCNi3
• Electronic structures of antiperovskite superconductors: MgXNi${}_3$ (X=B,C,N)
• Experimental determination of superconducting parameters for the intermetallic perovskite superconductor ${\text {MgCNi}}_3
• BCS-like Superconductivity in MgCNi3
• Normal state resistivity, upper critical field and Hall effect in superconducting perovskite $MgCN{i}_3$
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• Core pinning by intragranular nanoprecipitates in polycrystalline MgCNi_3

Cited by in corpus (5)

• Evidence for strong electron-phonon coupling in MgCNi_3
• Carbon isotope effect in superconducting MgCNi_3
• Gauge Fluctuations in Superconducting Films
• Halperin-Lubensky-Ma effect in type-I superconducting films
• Nearly Ferromagnetic Superconductors