Andreev reflection spectroscopy on the heavy-fermion superconductor PrOs$_{4}$Sb$_{12}$: Microscopic evidence for multiple superconducting order parameters

C. S. Turel; W. M. Yuhasz; R. Baumbach; M. B. Maple; J. Y. T. Wei

Andreev reflection spectroscopy on the heavy-fermion superconductor PrOs$_{4}$Sb$_{12}$: Microscopic evidence for multiple superconducting order parameters

Superconductivity 2011-10-25 v1

Authors: C. S. Turel , W. M. Yuhasz , R. Baumbach , M. B. Maple , J. Y. T. Wei

Abstract

Point-contact Andreev reflection spectroscopy was performed on single crystals of the heavy-fermion superconductor PrOs $_{4}$ Sb $_{12}$ , down to 90mK and up to 3Tesla. The conductance spectra showed multiple structures, including zero-bias peaks and spectral dips, which are interpreted as signatures of multiple pairing gaps, one clearly having nodes. Samples with 2% Ru replacing Os were also measured, showing pronounced spectral humps consistent with the emergence of a non-nodal gap. Detailed analysis of the spectral evolution revealed a magnetic field-\emph{vs.}-temperature phase diagram for PrOs $_{4}$ Sb $_{12}$ characterized by two distinct superconducting order parameters.

Keywords

Andreev reflection spectroscopy heavy-fermion superconductor PrOs4Sb12 multiple superconducting order parameters pairing gaps point-contact spectroscopy phase diagram

Cite

@article{arxiv.1110.5104,
  title  = {Andreev reflection spectroscopy on the heavy-fermion superconductor PrOs$_{4}$Sb$_{12}$: Microscopic evidence for multiple superconducting order parameters},
  author = {C. S. Turel and W. M. Yuhasz and R. Baumbach and M. B. Maple and J. Y. T. Wei},
  journal= {arXiv preprint arXiv:1110.5104},
  year   = {2011}
}

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4 pages, 4 figures

Andreev reflection spectroscopy on the heavy-fermion superconductor PrOs$_{4}$Sb$_{12}$: Microscopic evidence for multiple superconducting order parameters

Abstract

Keywords

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