title: Excitation spectrum of PrOs(4)Sb(12) under a magnetic field.
abstract: The evolution of the magnetic excitation spectrum of the heavy fermion superconductor PrOs(4)Sb(12) was studied by inelastic neutron scattering on crossing the critical field H(c2) for superconductivity at low temperature. The peak positions in energy and the peak intensities of the modes of the triplet split by magnetic field confirm the known crystal field parameters for PrOs(4)Sb(12) in T(h) symmetry. A selective broadening of the lineshape occurs on increasing the magnetic field: the linewidth of the upper mode of the triplet increases while the one of the middle mode does not.
authors.affiliation: CEA-DSM/INAC/SPSMS, F-38054 Grenoble, France.
authors.forename: S
authors.initials: S
authors.lastname: Raymond
authors.forename: K
authors.initials: K
authors.lastname: Kuwahara
authors.forename: K
authors.initials: K
authors.lastname: Kaneko
authors.forename: K
authors.initials: K
authors.lastname: Iwasa
authors.forename: M
authors.initials: M
authors.lastname: Kohgi
authors.forename: A
authors.initials: A
authors.lastname: Hiess
authors.forename: J
authors.initials: J
authors.lastname: Flouquet
authors.forename: N
authors.initials: N
authors.lastname: Metoki
authors.forename: H
authors.initials: H
authors.lastname: Sugawara
authors.forename: Y
authors.initials: Y
authors.lastname: Aoki
authors.forename: H
authors.initials: H
authors.lastname: Sato