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Muon-Spin Rotation Study of the Ternary Noncentrosymmetric Superconductors Li2Pd x Pt3?x B |
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| Authors: | P S Häfliger R Khasanov R Lortz A Petrovi? K Togano C Baines B Graneli H Keller |
| Affiliation: | 1. Physik-Institut der Universit?t Zürich, Winterthurerstrasse 190, 8057, Zürich, Switzerland 2. Laboratory for Muon-Spin Spectroscopy, Paul Scherrer Institute, CH-5232, Villigen PSI, Switzerland 3. Département de Physique de la Matière Condensée de Genève, 24 quai Ernest-Ansermet, 1211, Geneva, Switzerland 4. National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, 305-0047, Japan |
| Abstract: | We investigated the superconducting state of the noncentrosymmetric superconductors Li2Pd x Pt3−x B with superconducting transition temperature T c=5.16(8) K (x=2.25), 3.56(8) K (x=1.5) and 2.60 K (x=0) by means of muon-spin rotation (μSR) and specific heat experiments. The μSR relaxation rate σ sc was found to be constant at low temperatures for all the compounds. Data taken at different magnetic fields show that the magnetic penetration depth λ is field-independent for Li2Pd2.25Pt0.75B and Li2Pt3B. The electronic contribution to the specific heat measured in Li2Pd1.5Pt1.5B and Li2Pt3B increases exponentially at the lowest temperatures. These features suggest that the whole family of Li2Pd x Pt3−x B comprises single-gap s-wave superconductors across the entire doping regime. |
| Keywords: | Noncentrosymmetric superconductors Magnetic penetration depth |
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