Title: Strong-Coupling d-wave Superconductivity in PuCoGa5 Probed by Point Contact Spectroscopy
Authors: DAGHERO DarioTORTELLO MauroUMMARINO G. A.GRIVEAU Jean-ChristopheCOLINEAU EricELOIRDI RachelSHIK ALEXANDERKOLORENC JindrichLICHTENSTEIN A.i.CACIUFFO Roberto
Citation: NATURE COMMUNICATIONS vol. 3 no. 786 p. 8
Publisher: NATURE PUBLISHING GROUP
Publication Year: 2012
JRC Publication N°: JRC66672
ISSN: 2041-1723
URI: http://www.nature.com/ncomms/journal/v3/n4/full/ncomms1785.html
http://publications.jrc.ec.europa.eu/repository/handle/JRC66672
DOI: 10.1038/ncomms1785
Type: Articles in Journals
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.
JRC Institute:Institute for Transuranium Elements

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