Magnetic-field-induced insulator-metal transition in W-doped VO2 at 500 T.

Nature Communications
Yasuhiro H MatsudaYuji Muraoka

Abstract

Metal-insulator (MI) transitions in correlated electron systems have long been a central and controversial issue in material science. Vanadium dioxide (VO2) exhibits a first-order MI transition at 340 K. For more than half a century, it has been debated whether electron correlation or the structural instability due to dimerised V ions is the more essential driving force behind this MI transition. Here, we show that an ultrahigh magnetic field of 500 T renders the insulator phase of tungsten (W)-doped VO2 metallic. The spin Zeeman effect on the d electrons of the V ions dissociates the dimers in the insulating phase, resulting in the delocalisation of electrons. As the Mott-Hubbard gap essentially does not depend on the spin degree of freedom, the structural instability is likely to be the more essential driving force behind the MI transition.

References

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May 23, 1994·Physical Review Letters·R M WentzcovitchP B Allen
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Jun 28, 2012·Scientific Reports·Xiaogang TanShiqiang Wei
Oct 4, 2018·The Review of Scientific Instruments·D NakamuraS Takeyama

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Citations

Feb 6, 2021·Scientific Reports·In-Hui HwangSang-Wook Han
Apr 7, 2021·The Review of Scientific Instruments·M GenT Nomura
Nov 13, 2020·The Journal of Physical Chemistry Letters·Bowen LiChongwen Zou

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