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Superconducting properties of MgCNi3 films D. P. Young, M. Moldovan, D. D. Craig, and P. W. Adams
 

Summary: Superconducting properties of MgCNi3 films
D. P. Young, M. Moldovan, D. D. Craig, and P. W. Adams
Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, USA
Julia Y. Chan
Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803, USA
Received 28 April 2003; published 3 July 2003
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 subse-
quently 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) 14 T, which are both comparable to that of polycrystalline powders. Hall
measurements in the normal state give a carrier density, n 4.2 1022
cm 3
, that is approximately 4 times
that reported for bulk samples.
DOI: 10.1103/PhysRevB.68.020501 PACS number s : 74.70.Ad, 74.78. w, 73.50. h
Over the last decade a broad and significant research ef-
fort has emerged aimed at identifying and characterizing
relatively low-Tc superconductors that are exotic in their nor-
mal state properties and/or order parameter symmetries. Ex-

  

Source: Adams, Philip W. - Department of Physics and Astronomy, Louisiana State University

 

Collections: Materials Science