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PHYSICAL REVIEW B 83, 144525 (2011) Physical properties of the noncentrosymmetric superconductor Nb0.18Re0.82
 

Summary: PHYSICAL REVIEW B 83, 144525 (2011)
Physical properties of the noncentrosymmetric superconductor Nb0.18Re0.82
A. B. Karki, Y. M. Xiong, N. Haldolaarachchige, S. Stadler, I. Vekhter, P. W. Adams, and D. P. Young
Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, USA
W. A. Phelan and Julia Y. Chan
Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803, USA
(Received 25 November 2010; revised manuscript received 4 March 2011; published 25 April 2011)
We report the synthesis and measurements of magnetic, transport, and thermal properties of polycrystalline
Nb0.18Re0.82, which has a superconducting transition at Tc 8.8 K. The noncentrosymmetric -Mn structure of
the compound is confirmed by x-ray diffraction. Using the measured values for the lower critical field Hc1, upper
critical field Hc2, and the specific heat C, we estimate the thermodynamic critical field Hc(0), coherence length
(0), penetration depth (0), and the Ginzburg-Landau parameter (0). The specific heat jump at Tc, C/ Tc
= 1.86, suggests that Nb0.18Re0.82 is a moderately coupled superconductor. Below Tc the electronic specific heat
decays exponentially, suggesting that the gap is isotropic. Our data suggest that the triplet admixture is weak in
the polycrystalline form of compound. However, the estimated value of the upper critical field Hc2(0) is close to
the calculated Pauli limit.
DOI: 10.1103/PhysRevB.83.144525 PACS number(s): 74.70.Ad
I. INTRODUCTION
The topic of superconductivity in systems lacking spatial
inversion symmetry has undergone resurgence since the

  

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

 

Collections: Materials Science