Magnetic structure of phase II in U(Ru(0.96)Rh(0.04))2Si2 determined by neutron diffraction under pulsed high magnetic fields

• Published in: Physical review letters Vol. 110; no. 21; p. 216406
• Main Authors: Kuwahara, K, Yoshii, S, Nojiri, H, Aoki, D, Knafo, W, Duc, F, Fabrèges, X, Scheerer, G W, Frings, P, Rikken, G L J A, Bourdarot, F, Regnault, L P, Flouquet, J
• Format: Journal Article
• Language: English
• Published: United States 24.05.2013
• ISSN: 1079-7114

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).