Superconducting properties of MgCNi3 films
D. P. Young, M. Moldovan, D. D. Craig, P. W. Adams, Julia Y. Chan
DOI 10.1103/PhysRevB.68.020501 · Physical Review B
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Abstract
We report the magnetotransport properties of thin polycrystalline films of the recently discovered nonoxide 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(T=0)=14T, which are both comparable to that of polycrystalline powders. Hall measurements in the normal state give a carrier density, n=−4.2×1022cm−3, that is approximately 4 times that reported for bulk samples.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| MgCNi3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 8.2 | Pressure not reported | midpoint |
| MgCNi3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3.9 | Pressure not reported | midpoint |
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