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Defect introduced paramagnetism and weak localization in two-dimensional metal VSe2.
Qiang Cao1,2, Frank F Yun1, Lina Sang1
1Institute for Superconducting and Electronic Materials, Australian Institute for Innovative Materials, University of Wollongong, North Wollongong, New South Wales, 2500, Australia.
Nanotechnology
|September 28, 2017
Summary
This study finds that intrinsic VSe2 is non-magnetic, contradicting previous ferromagnetic reports. Defects introduce weak paramagnetism and weak localization effects in VSe2 single crystals.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Solid State Chemistry
Background:
- Vanadium diselenide (VSe2) has been previously reported to exhibit ferromagnetic properties.
- The electronic configuration of V4+ ions suggests an expected Curie paramagnetism.
Purpose of the Study:
- To investigate the magnetism, valence state, and magnetotransport properties of VSe2 bulk single crystals and exfoliated laminates.
- To clarify the intrinsic magnetic behavior of VSe2, contrasting with prior findings.
Main Methods:
- Detailed investigation of magnetism, valence state, and magnetotransport.
- Mechanical exfoliation to obtain VSe2 laminates.
- Measurements performed from room temperature down to 2 K.
Main Results:
- No ferromagnetism was detected in VSe2 single crystals or laminates.
- Intrinsic VSe2 was found to be a non-magnetic alloy lacking local moments.
- A weak paramagnetic contribution from defects was observed below 50 K.
- A weak localization effect due to defects was observed in VSe2 single crystals for the first time.
Conclusions:
- Intrinsic VSe2 does not exhibit ferromagnetism.
- Defects play a significant role in the observed magnetic and transport properties of VSe2.
- Previous reports of ferromagnetism in VSe2 may be attributed to defect-induced phenomena.
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