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Title: Observation of orbital order in the half-filled 4f Gd compound

Half-filled electron systems, even with the maximized spin angular moment, have been given little attention because of their zero-orbital angular moment according to Hund’s rule. Nevertheless, there are several measurements that show evidence of a nonzero orbital moment as well as spin-orbit coupling. Here we report for the first time the orbital order in a half-filled 4f-electron system GdB4, using the resonant soft x-ray scattering at Gd M4,5-edges. Furthermore, we discovered that the development of this orbital order is strongly coupled with the antiferromagnetic spin order. Lastly, these results clearly demonstrate that even in half-filled electron systems the orbital angular moment can be an important parameter to describe material properties, and may provide significant opportunities for tailoring new correlated electron systems.
Authors:
 [1] ;  [2] ;  [2] ;  [1] ;  [1] ;  [3] ;  [1] ;  [1]
  1. SLAC National Accelerator Lab., Menlo Park, CA (United States)
  2. Gwangju Institute of Science and Technology (Korea)
  3. SLAC National Accelerator Lab., Menlo Park, CA (United States); Western Michigan Univ., Kalamazoo MI (United States)
Publication Date:
OSTI Identifier:
1349093
Report Number(s):
SLAC-PUB-16853
Journal ID: ISSN 0031-9007; PRLTAO; TRN: US1701238
Grant/Contract Number:
AC02-76SF00515; FG02-99ER45772; 2011-0028736; 2013K000315
Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 117; Journal Issue: 21; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Research Org:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS