期刊
PHYSICAL REVIEW LETTERS
卷 111, 期 21, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.111.217001
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资金
- NRF
- MEST [20100018092]
- GRL through the NRF [2011-00329]
- Ministry of Science, ICT, and Future Planning
- Basic Science Research Program [2012-008233]
- Korean Federation of Science and Technology Societies
- JSPS [21244049]
- MSIP through NRF [2010-0018092, 2009-0088969]
- KICOS [K20062000008]
- U.S. DOE [DE-AC02-76SF00515, AC02-06CH11357]
- Aneesur Rahman Postdoctoral Fellowship at Argonne National Laboratory
- National Research Foundation of Korea [2010-0018092, 2009-0088969] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- Grants-in-Aid for Scientific Research [25247054, 21244049] Funding Source: KAKEN
We performed temperature dependent x-ray linear dichroism (XLD) experiments on an iron pnictide system, Ba(Fe1-xCox)(2)As-2 with x = 0.00, 0.05, 0.08, and 0.10 to experimentally verify the existence of orbital ordering (OO). Substantial XLD was observed in polarization dependent x-ray absorption spectra of Fe L edges. By exploiting the difference in the temperature dependent behaviors, OO, and structure contributions to XLD could be clearly separated. The observed OO signal indicates different occupation numbers for d(yz) and d(zx) orbitals and supports the existence of ferro-OO. The results are also consistent with the theoretical prediction. Moreover, we find substantial OO signal well above the structural and magnetic transition temperatures, which suggests the existence of strong OO fluctuations up to high temperatures.
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