Title: Energy scale of the electron-boson spectral function and superconductivity in NpPd5Al2
Citation: PHYSICAL REVIEW B no. 82 p. 104510-1 - 104510-7
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 periodicals and books
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 Directorate:Nuclear Safety and Security

Files in This Item:
There are no files associated with this item.

Items in repository are protected by copyright, with all rights reserved, unless otherwise indicated.