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Hidden octupole order in URuSi

Journal of Physics Condensed Matter, ISSN: 0953-8984, Vol: 19, Issue: 7, Page: 072202
2007
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Article Description

We propose that the hidden order in URuSi is an incommensurate octupole order, which is derived from a spin-1 XXZ model with XX octupole and Z dipole interactions based on the singlet-doublet crystal-field level scheme. The octupole moments break time-reversal invariance and give rise to finite hyperfine fields on the nuclei of the ligand Si and Ru ions. In order for the hyperfine fields to be observed as a nuclear magnetic resonance (NMR) linewidth, the order must be incommensurate, with the ordering vector determined so as to account for the Si NMR linewidth data quantitatively. © IOP Publishing Ltd.

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