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Suppression of magnetic ordering in Fe-deficient Fe3–xGeTe2 from application of pressure

Journal Article · · Physical Review B
 [1];  [2];  [3];  [3];  [3];  [4];  [3];  [4];  [4];  [5];  [3];  [3]
  1. Univ. of California, Riverside, CA (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Lawrence Livermore National Laboratory
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of California, Davis, CA (United States)
  3. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  4. The Ohio State Univ., Columbus, OH (United States)
  5. Univ. of California, Davis, CA (United States)
+ Show Author Affiliations

Two-dimensional van der Waals magnets with multiple functionalities are becoming increasingly important for emerging technologies in spintronics and valleytronics. Application of external pressure is one method to cleanly explore the underlying physical mechanisms of the intrinsic magnetism. In this paper, the magnetic, electronic,and structural properties of van der Waals-layered, Fe-deficient Fe3-xGeTe2 are investigated. Magnetotransport measurements show a monotonic decrease in the Curie temperature (Tc) and the magnetic moment with increasing pressure up to 13.9 GPa. The electrical resistance of Fe3-xGeTe2 shows a change from metallic to a seemingly nonmetallic behavior with increasing pressure. High-pressure angle dispersive powder x-ray diffraction shows a monotonic compression of the unit cell and a reduction of the volume by ~25% with no evidence of structural phase changes up to 29.4(4) GPa. Here, we suggest that the decrease in the Tc due to pressure results from increased intralayer coupling and delocalization that leads to a change in the exchange interaction.

Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Advanced Photon Source (APS), Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC); USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
AC52-07NA27344; AC02-06CH11357; AC05-00OR22725
OSTI ID:
1644290
Alternate ID(s):
OSTI ID: 1647369
OSTI ID: 1649448
OSTI ID: 1650437
Journal Information:
Physical Review B, Journal Name: Physical Review B Journal Issue: 5 Vol. 102; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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36 MATERIALS SCIENCE
Ferromagnetism
Magnetic phase transitions
Magnetization measurements
Phase diagrams
Pressure effects
Van der Waals systems
X-ray diffraction