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Superconducting and magnetotransport properties of ZnNNi3 microfibers and films A. B. Karki, Y. M. Xiong, D. P. Young, and P. W. Adams
 

Summary: Superconducting and magnetotransport properties of ZnNNi3 microfibers and films
A. B. Karki, Y. M. Xiong, D. P. Young, and P. W. Adams
Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, USA
Received 12 February 2009; revised manuscript received 21 May 2009; published 12 June 2009
We present the superconducting and critical current properties of ZnNNi3 in the form of annularly coated
carbon microfibers and thin films. The fibers were prepared by heating 68 m diameter commercially
available Ni-coated carbon fibers with Zn powder in a flowing stream of NH3 gas at 650 C. The fibers had a
Tc=3.75 K, which was slightly higher than that of the polycrystalline powder and an upper critical field,
Hc2 0 =0.92 T. Near the transition temperature Tc, the critical current density Jc was well described by the
Ginzburg-Landau power-law form 1- T/Tc
2 3/2
. The extrapolation produces Jc 0 1.45 106
A/cm2
. An
axial magnetic field produces an exponential decrease in the critical current density. Planar ZnNNi3 films were
formed on sapphire substrates by exposing thin Ni films to a similar heat treatment as the fibers. Hall mea-
surements on the films in the normal state revealed a carrier density, n=-1.46 1023
cm-3
.
DOI: 10.1103/PhysRevB.79.212508 PACS number s : 74.78.Db

  

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

 

Collections: Materials Science