Muon-Spin Rotation Study of the Ternary Noncentrosymmetric Superconductors Li2Pd x Pt3−x B

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 (muSR) and specific heat experiments. The muSR relaxation rate sig...

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Bibliographic Details
Published in:Journal of superconductivity and novel magnetism 2009-05, Vol.22 (4), p.337-342
Main Authors: Häfliger, P. S., Khasanov, R., Lortz, R., Petrović, A., Togano, K., Baines, C., Graneli, B., Keller, H.
Format: Article
Language:English
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Summary: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 (muSR) and specific heat experiments. The muSR relaxation rate sigma 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 lambda 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.
ISSN:1557-1939
1557-1947
DOI:10.1007/s10948-008-0440-y