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Experimental Verification of the Van Vleck Nature of Long-Range Ferromagnetic Order in the Vanadium-Doped Three-Dimensional Topological Insulator Sb2Te3

Li, Mingda ; Chang, Cui-Zu ; Wu, Lijun ; Tao, Jing ; Zhao, Weiwei ; Chan, Moses H W ; Moodera, Jagadeesh S ; Li, Ju ; Zhu, Yimei

Physical review letters, 2015-04, Vol.114 (14) [Periódico revisado por pares]

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  • Título:
    Experimental Verification of the Van Vleck Nature of Long-Range Ferromagnetic Order in the Vanadium-Doped Three-Dimensional Topological Insulator Sb2Te3
  • Autor: Li, Mingda ; Chang, Cui-Zu ; Wu, Lijun ; Tao, Jing ; Zhao, Weiwei ; Chan, Moses H W ; Moodera, Jagadeesh S ; Li, Ju ; Zhu, Yimei
  • Assuntos: Electron energy loss spectroscopy ; Ferromagnetism ; Insulators ; Magnetization ; Position measurement ; Spectra ; Three dimensional ; Topology
  • É parte de: Physical review letters, 2015-04, Vol.114 (14)
  • Notas: ObjectType-Article-1
    SourceType-Scholarly Journals-1
    ObjectType-Feature-2
    content type line 23
  • Descrição: 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 (L3 and L2) 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.
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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