Title: Energy scale of the electron-boson spectral function and superconductivity in NpPd5Al2
Authors: UMMARINO G. A.CACIUFFO RobertoCHUDO H.KAMBE Shinsaku
Citation: PHYSICAL REVIEW B no. 82 p. 104510-1 - 104510-7
Publisher: AMER PHYSICAL SOC
Publication Year: 2010
JRC N°: JRC59034
ISSN: 1098-0121
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC59034
DOI: 10.1103/PhysRevB.82.104510
Type: Articles in Journals
Abstract: The energy scale ­0 of the electron-boson spectral function in the heavy-fermion, d-wave superconductor NpPd5Al2 is predicted on the basis of Eliashberg theory calculations. Assuming a spectral function shape typical for antiferromagnetic spin fluctuations, and imposing constraints provided by the experimental values for the critical temperature and the low-temperature energy gap, one obtains values of ­0 of about 2-2.5 meV, slightly dependent from the strength of the Coulomb pseudopotential. These values are in excellent agreement with the characteristic magnetic °uctuations energy estimated from NMR measurements of the nuclear-spin-lattice relaxation time at the Al site. The calculated temperature dependence of the upper critical field, the local spin susceptibility, and the nuclear spin-lattice relaxation rate is also in good agreement with available experimental data, showing that a coherent description of the superconducting state can be obtained assuming that the electron pairing in NpPd5Al2 is mediated by antiferromagnetic fluctuations. We finally report predictions for the London penetration depth, the energy dependence of the tunneling differential conductance at different temperatures, and the temperature dependence of the energy gap.
JRC Institute:Institute for Transuranium Elements

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