title: Magnetic structure of phase II in U(Ru(0.96)Rh(0.04))2Si2 determined by neutron diffraction under pulsed high magnetic fields.
abstract: We report neutron diffraction measurements on U(Ru(0.96)Rh(0.04))(2)Si(2) single crystal under pulsed high magnetic fields up to 30 T applied along the tetragonal c axis. The high-field experiments revealed that the field-induced phase II above 26 T corresponds to a commensurate up-up-down ferrimagnetic structure characterized by the wave vector q=(2/3,0,0) with the magnetic moments parallel to the c axis, which naturally explains the one-third magnetization plateau and the substantially changed Fermi surface in phase II. This a-axis modulated magnetic structure indicates that the phase II near the hidden order phase is closely related to the characteristic incommensurate magnetic fluctuations at Q(1)=(0.6,0,0) in the pure system URu(2)Si(2), in contrast to the pressure-induced antiferromagnetic order at Q(0)=(1,0,0).
authors.affiliation: Institute of Applied Beam Science, Ibaraki University, Mito 310-8512, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Kuwahara
authors.forename: S
authors.initials: S
authors.lastname: Yoshii
authors.forename: H
authors.initials: H
authors.lastname: Nojiri
authors.forename: D
authors.initials: D
authors.lastname: Aoki
authors.forename: W
authors.initials: W
authors.lastname: Knafo
authors.forename: F
authors.initials: F
authors.lastname: Duc
authors.forename: X
authors.initials: X
authors.lastname: Fabrèges
authors.forename: G W
authors.initials: GW
authors.lastname: Scheerer
authors.forename: P
authors.initials: P
authors.lastname: Frings
authors.forename: G L J A
authors.initials: GL
authors.lastname: Rikken
authors.forename: F
authors.initials: F
authors.lastname: Bourdarot
authors.forename: L P
authors.initials: LP
authors.lastname: Regnault
authors.forename: J
authors.initials: J
authors.lastname: Flouquet