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

Abstract

We demonstrate by high resolution low temperature electron energy loss spectroscopy (EELS) measurements that the long range ferromagnetic (FM) order in 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=10K. Magnetotransport and comparison of the measured and simulated EELS spectra confirm that these changes originate from 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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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 2015
Accession Number
ADA623258

Entities

People

  • Cui-Zu Chang
  • Jagadeesh Moodera
  • Jing Tao
  • Ju Li
  • Lijun Wu
  • Mingda Li
  • Moses H. Chan
  • Weiwei Zhao
  • Yimei Zhu

Organizations

  • Massachusetts Institute of Technology

Tags

Communities of Interest

  • Advanced Electronics

DTIC Thesaurus Topics

  • Dielectrics
  • Electron Energy
  • Elements
  • Energy Bands
  • Films
  • High Resolution
  • Low Temperature
  • Magnetic Fields
  • Magnetic Properties
  • Materials
  • Materials Science
  • Measurement
  • Quantum Properties
  • Spin-Orbit Interaction
  • Three Dimensional
  • Transition Metals
  • Vanadium

Fields of Study

  • Physics

Readers

  • Materials Science and Engineering.
  • Superconducting Magnet Technology

Technology Areas

  • Microelectronics
  • Microelectronics - Graphene