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Structure and physical properties of the noncentrosymmetric superconductor Mo3Al2C A. B. Karki, Y. M. Xiong, I. Vekhter, D. Browne, P. W. Adams, and D. P. Young
 

Summary: Structure and physical properties of the noncentrosymmetric superconductor Mo3Al2C
A. B. Karki, Y. M. Xiong, I. Vekhter, D. Browne, P. W. Adams, and D. P. Young
Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, USA
K. R. Thomas and Julia Y. Chan
Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803, USA
H. Kim and R. Prozorov
Ames Laboratory and Department of Physics & Astronomy, Iowa State University, Ames, Iowa 50011, USA
Received 7 May 2010; published 17 August 2010
We have synthesized polycrystalline samples of the noncentrosymmetric superconductor Mo3Al2C by arc
and RF melting, measured its transport, magnetic and thermodynamic properties, and computed its band
structure. Experimental results indicate a bulk superconducting transition at Tc 9.2 K while the density of
states at the Fermi surface is found to be dominated by Mo d orbitals. Using the measured values for the lower
critical field Hc1, upper critical field Hc2, and the specific heat C, we estimated 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=2.14, suggests that Mo3Al2C is moderately to strongly coupled, consistent with the
fast opening of the gap, as evidenced by the rapid release of entropy below Tc from our electronic specific-heat
measurements. Above 2 K the electronic specific heat exhibits the power-law behavior, suggesting that syn-
thesis of single crystals and measurements at lower temperature are needed to establish whether the gap is
anisotropic. The estimated value of the upper critical field Hc2 0 is close to the calculated Pauli limit, therefore
further studies are needed to determine whether the absence of an inversion center results in a significant

  

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

 

Collections: Materials Science