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Strong-coupling d-wave superconductivity in PuCoGa5 probed by point-contact spectroscopy

Author

Listed:
  • D. Daghero

    (Politecnico di Torino)

  • M. Tortello

    (Politecnico di Torino)

  • G.A. Ummarino

    (Politecnico di Torino)

  • J.-C. Griveau

    (European Commission, Joint Research Centre, Institute for Transuranium Elements)

  • E. Colineau

    (European Commission, Joint Research Centre, Institute for Transuranium Elements)

  • R. Eloirdi

    (European Commission, Joint Research Centre, Institute for Transuranium Elements)

  • A.B. Shick

    (European Commission, Joint Research Centre, Institute for Transuranium Elements
    Institute of Physics, Academy of Sciences of the Czech Republic)

  • J. Kolorenc

    (Institute of Physics, Academy of Sciences of the Czech Republic)

  • A.I. Lichtenstein

    (University of Hamburg, Institute of Theoretical Physics)

  • R. Caciuffo

    (European Commission, Joint Research Centre, Institute for Transuranium Elements)

Abstract

Superconductivity is due to an attractive interaction between electrons that, below a critical temperature, drives them to form Cooper pairs and to condense into a ground state separated by an energy gap from the unpaired states. In the simplest cases, the pairing is mediated by lattice vibrations and the wavefunction of the pairs is isotropic. Less conventional pairing mechanisms can favour more exotic symmetries of the Cooper pairs. Here, we report on point-contact spectroscopy measurements in PuCoGa5, a moderate heavy-fermion superconductor with a record high critical temperature Tc=18.5 K. The results prove that the wavefunction of the paired electrons has a d-wave symmetry, with four lobes and nodes, and show that the pairing is likely to be mediated by spin fluctuations. Electronic structure calculations, which take into account the full structure of the f-orbital multiplets of Pu, provide a hint of the possible origin of these fluctuations.

Suggested Citation

  • D. Daghero & M. Tortello & G.A. Ummarino & J.-C. Griveau & E. Colineau & R. Eloirdi & A.B. Shick & J. Kolorenc & A.I. Lichtenstein & R. Caciuffo, 2012. "Strong-coupling d-wave superconductivity in PuCoGa5 probed by point-contact spectroscopy," Nature Communications, Nature, vol. 3(1), pages 1-8, January.
    • Handle: RePEc:nat:natcom:v:3:y:2012:i:1:d:10.1038_ncomms1785
    DOI: 10.1038/ncomms1785
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    Cited by:

    1. Caorong Zhang & Junwei Huang & Kun Zhai & Keivan Akhtari & Zhiwei Shen & Lingyi Ao & Zeya Li & Feng Qin & Yukai Chang & Ling Zhou & Ming Tang & Xueting Dai & Caiyu Qiu & Yi Zhang & Lin Wang & Zhongyua, 2022. "Valence-skipping and quasi-two-dimensionality of superconductivity in a van der Waals insulator," Nature Communications, Nature, vol. 13(1), pages 1-9, December.

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