paper

Absence of a static in-plane magnetic moment in the "hidden-order" phase of URu $_{2}$ Si $_{2}$

arXiv:1303.4135 · doi:10.1088/1367-2630/15/5/053031

Abstract

We have carried out a careful magnetic neutron scattering study of the heavy fermion compound \URuSi\ to probe the possible existence of a small magnetic moment parallel to tetragonal basal plane in the "hidden-order" phase. This small in-plane component of the magnetic moment on the uranium sites $S_{∥}$ has been postulated by two recent models (rank-5 superspin/hastatic order) aiming to explain the hidden-order phase, in addition to the well-known out-of-plane component $S_{⊥} \approx 0.01 - 0.04$ Î¼_B $/ U . I n or d er t ose p a r a t e$ S_\parallel $an d$ S_\perp $w e t ak e a d v an t a g eo f t h eco n d i t i o n t ha t f or ma g n e t i c n e u t r o n sc a tt er in g o n l y t h eco m p o n e n t so f t h e ma g n e t i cs t r u c t u r e t ha t a r e p er p e n d i c u l a r t o t h esc a tt er in g v ec t or$ Q $co n t r ib u t e t o t h e ma g n e t i csc a tt er in g . W e f in d n oe v i d e n ce f or anin - pl an e ma g n e t i c m o m e n t$ S_\parallel $. B a se d o n t h es t a t i s t i cso f o u r m e a s u r e m e n t, w ees t ab l i s h t ha tt h e u pp er e x p er im e n t a l l imi t f or t h es i z eo f an y p oss ib l e in - pl an eco m p o n e n t i s$ S^{\rm{max}}_\parallel ~ \leq~1\cdot 10^{-3} ~Î¼_B$/U.

12 pages, 4 figures, updated introduction and discussion

Absence of a static in-plane magnetic moment in the "hidden-order" phase of URu2​Si2​

Abstract

Absence of a static in-plane magnetic moment in the "hidden-order" phase of URu $_{2}$ Si $_{2}$