Study of an incommensurate field-induced magnetic phase in hidden-order system U(Ru0.98Rh0.02)2Si2
Recently we have completed experiment 5-41-954: the high-field neutron diffraction in pulsed fields up to 40 T on a 2% Rh-doped URu2Si2. This study revealed that the field-induced phases have propagation vector Q = (0.63 0 ±δ) with δ very small. This result is in contrast to both the pure system and higher Rh-doping levels, where propagation vector q1 = (0.6 0 0) and q3 = (0.667 0 0) are found and suggests that a multi-k structure may be realized in high fields. The change in the propagation vector may be linked to modifications of the Fermi surface. The decrease of the intensity above 35.3 T (from the phase II to phase III (see Fig. 4 of the proposal) suggests a change in the δ value. Due to a short wavelength necessary to reach other Bragg reflections we were limited by the resolution of the instrument. In this proposal we wish to determine the value of δ for both phases II and III. We also suggest to study the field induced phase(s) at higher temperature, namely around 10 K, where the hidden order is dominant in this system. We ask for 8 days of beamtime at IN22.
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PROKES Karel; AOKI Dai; BOURDAROT Frederic; DUC Fabienne; FLOUQUET Jacques; FRINGS Paul; KNAFO William; KUWAHARA Keitaro; NOJIRI Hiroyuki and REGNAULT Louis Pierre. (2020). Study of an incommensurate field-induced magnetic phase in hidden-order system U(Ru0.98Rh0.02)2Si2. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-41-1035
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