Evidence for s-wave superconductivity in noncentrosymmetric Re₃W from magnetic penetration depth measurements

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Yuri L. Zuev,¹ Valentina A. Kuznetsova,² Ruslan Prozorov,³ Matthew D. Vannette,³ Maxim V. Lobanov,⁴ David K. Christen,¹ and James R. Thompson^1,2
¹Material Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
²Department of Physics, University of Tennessee, Knoxville, Tennessee 37996, USA
³Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA
⁴Research and Development Department, Huntsman-NMG, Obninsk 249032, Russia

Received 12 July 2007; revised 13 September 2007; published 22 October 2007

Wereport measurements of the temperature dependence of the magnetic penetrationdepth lambda (T) in noncentrosymmetric superconductor Re₃W. We employed two experimentaltechniques: extraction of lambda (T) from magnetic dc susceptibility, measured ona powder sample, and the rf tunnel diode resonator technique,where a bulk polycrystalline sample was used. The results ofboth techniques agree: the temperature dependence of the penetration depthcan be well described by weak-coupling, dirty-limit, s-wave BCS theorywhere we obtain Delta (0)/k_BT_C=1.76±0.05. No evidence for unconventional pairing resultingfrom the absence of the inversion symmetry is found.

URL:	http://link.aps.org/doi/10.1103/PhysRevB.76.132508
DOI:	10.1103/PhysRevB.76.132508
PACS:	74.25.Ha; 74.70.Ad; 74.90.+n 74.25.Ha Magnetic properties of superconductors 74.70.Ad Superconducting metals; alloys and binary compounds (including A15, MgB₂, etc.) 74.90.+n Other topics in superconductivity (restricted to new topics in section 74) YEAR: 2007
KEYWORDS:	BCS theory, magnetic susceptibility, penetration depth (superconductivity), rhenium compounds, superconducting materials, superconducting transition temperature

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