期刊
PHYSICAL REVIEW LETTERS
卷 114, 期 14, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.114.146802
关键词
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资金
- U.S. Department of Energy, Office of Basic Energy Sciences [DE-AC02-98CH10886]
- STC Center for Integrated Quantum Materials under NSF [DMR-1231319]
- NSF DMR Grants [1207469]
- ONR Grant [N00014-13-1-0301]
- NSF MRSEC program [DMR-0820404, DMR-1420620]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1207469] Funding Source: National Science Foundation
We demonstrate by high resolution low temperature electron energy loss spectroscopy (EELS) measurements that the long range ferromagnetic (FM) order in the vanadium- (V-)doped topological insulator Sb2Te3 has the nature of van Vleck-type ferromagnetism. The positions and the relative amplitudes of two core-level peaks (L-3 and L-2) of the V EELS spectrum show unambiguous change when the sample is cooled from room temperature to T = 10 K. Magnetotransport and comparison of the measured and simulated EELS spectra confirm that these changes originate from the onset of FM order. Crystal field analysis indicates that in V-doped Sb2Te3, partially filled core states contribute to the FM order. Since van Vleck magnetism is a result of summing over all states, this magnetization of core level verifies the van Vleck-type ferromagnetism in a direct manner.
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