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Phys. Rev. B 73, 184523 (2006) [4 pages]

Anisotropic s-wave superconductivity in CaAlSi single crystals from penetration depth measurements

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Ruslan Prozorov
Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA

Tyson A. Olheiser and Russell W. Giannetta
Department of Physics, University of Illinois at Urbana-Champaign, 1110 West Green Street, Urbana, Illinois 61801, USA

Kentaro Uozato and Tsuyoshi Tamegai
Department of Applied Physics, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-8656, Japan

Received 28 February 2006; published 23 May 2006

In- and out-of-plane London penetration depths were measured in CaAlSi single crystals (Tc=6.2 and 7.3 K) using a tunnel-diode resonator. A full three-dimensional (3D) BCS analysis of the superfluid density is consistent with a prolate spheroidal gap, with a weak-coupling BCS value in the ab plane and stronger coupling along the c axis. The gap anisotropy was found to significantly decrease for higher Tc samples.

© 2006 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.73.184523
DOI:
10.1103/PhysRevB.73.184523
PACS:
74.25.Nf, 74.20.Rp, 74.70.Ad
 
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