title: YMn2Hx and RMn(2-y)Fe(y)H6 (R = Y, Er) studied by Raman, infrared and inelastic neutron scattering spectroscopies.
abstract: YMn2 forms either interstitial YMn2Hx hydrides for x < or = 4.5 or a complex YMn2H6 hydride when submitted to high hydrogen pressure. These compounds have been studied by inelastic neutron scattering (INS) in order to clarify the different modes of H vibration. The INS spectra of YMn2Hx hydrides are strongly dependent on the H content. YMn2H6 and YMn2D6 show broad bands, also observed by Raman and IR spectroscopy, assigned to H-Mn-H (or D) and Mn-H bending and stretching modes. Both ErMn2D6 and ErMn1.8Fe0.2D6 show, in addition to the H vibration mode, an intense band at 215 cm(-1) which has been attributed to a magnetic excitation of Er3+ in view of its momentum transfer dependence.
authors.affiliation: Institut de Chimie et des Matériaux de Paris-Est, CMTR, CNRS and UPEC, 2-8 rue H. Dunant, 94320 Thiais Cedex, France. paulbon@icmpe.cnrs.fr
authors.forename: V
authors.initials: V
authors.lastname: Paul-Boncour
authors.forename: S F
authors.initials: SF
authors.lastname: Parker
authors.forename: H
authors.initials: H
authors.lastname: Hagemann
authors.forename: S M
authors.initials: SM
authors.lastname: Filipek
authors.forename: R
authors.initials: R
authors.lastname: Wierzbicki
authors.forename: M
authors.initials: M
authors.lastname: Latroche