The orbitally degenerate binuclear unit t22g−t22g

Pourroy, G.; Drillon, Marc; Padel, L.; Bernier, J.C.

doi:10.1016/0378-4363(83)90006-2

Cited by 6 publications

(2 citation statements)

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“…The T MI almost linearly decreases with W doping up to x = 0.07. 23 Although we could not detect any anomaly in magnetic susceptibility for the higher-doping ͑x Ն 0.11͒ films, the strong electron correlation in the V 3+ ͑not V 4+ ͒-band materials likely contribute to forming the in-sulating ground state. 12 Therefore, the insulating ground state is thought to be nonmagnetic ͑spin singlet͒ in nature.…”

mentioning

confidence: 54%

Metal-insulator transition in epitaxial V1−xWxO2(≤x≤0.33) thin films

Shibuya

Kawasaki

Tokura

2010

Applied Physics Letters

188

151

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Articles you may be interested inControlling the sharpness of metal-insulator transition in epitaxial (La1−xPrx)0.67Ca0.33MnO3 (0≤x≤0.35) films Evidence of the metal-insulator transition in ultrathin unstrained V2O3 thin films Appl. Phys. Lett. 104, 071902 (2014); 10.1063/1.4866004 Comprehensive study of the metal-insulator transition in pulsed laser deposited epitaxial VO2 thin films Increased metal-insulator transition temperatures in epitaxial thin films of V 2 O 3 prepared in reduced oxygen environments Appl. Phys. Lett. 98, 152105 (2011);

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mentioning

confidence: 54%

Metal-insulator transition in epitaxial V1−xWxO2(≤x≤0.33) thin films

Shibuya

Kawasaki

Tokura

2010

Applied Physics Letters

188

151

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“…Possibly, there is another type of structural instability in the W-rich side. Note that a threefold superstructure having V 3+ -V 3+ (V 4+ -V 4+ ) pairs separated by W 6+ (W 4+ ) ions occurs in the trirutile structure of V 2 WO 6 [121,122]. Thus, one would expect a structural transition from a uniform V-V-W chain to a dimerized (V-V)-W chain in V 2 WO 6 , which must be accompanied by an MIT.…”

Section: Substitution Effectsmentioning

confidence: 99%

Structural instability of the rutile compounds and its relevance to the metal–insulator transition of VO2

Hiroi

2015

Progress in Solid State Chemistry

103

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The metal-insulator transition (MIT) of VO 2 is discussed with particular emphasis on the structural instability of the rutile compounds toward dimerization. Ti substitution experiments reveal that the MIT is robust up to 20% Ti substitutions and occurs even in extremely thin V-rich lamellas in spinodally decomposed TiO 2 -VO 2 composites, indicating that the MIT is insensitive to hole doping and essentially takes on a local character. These observations suggest that either electron correlation in the Mott-Hubbard sense or Peierls (Fermi-surface) instability plays a minor role on the MIT. Through a broad perspective of crystal chemistry on the rutile-related compounds, it is noted that VO 2 and another MIT compound NbO 2 in the family eventually lie just near the borderline between the two structural groups with the regular rutile structure and the distorted structures characterized by the formation of dimers with direct metal-metal bonding. It is also shown that the two compounds of the rutile form do not follow the general trends in structure observed for the other rutile compounds, giving clear evidence of an inherent structural instability present in the two compounds. The MITs of VO 2 and NbO 2 are natural consequences of structural transitions between the two groups, as all the d electrons are trapped in the bonding molecular orbitals of dimers at low temperatures. Such dimer crystals are ubiquitously found in early transition metal compounds having chain-like structures, such as MoBr 3 , NbCl 4 , Ti 4 O 7 , and V 4 O 7 , the latter two of which also exhibit MITs probably of the same origin. In a broader sense, the dimer crystal is a kind of "molecular orbital crystals" in which virtual molecules made of transition metal atoms with partially-filled t 2g shells, such as dimers, trimers or larger ones, are generated by metal-metal bonding and are embedded into edge-or face-sharing octahedron networks of various kinds. The molecular orbital crystallization opens a natural route to stabilization of unpaired t 2g electrons in crystals.2

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