The minimum conductivity and electron localisation in the metallic phase of transition metal compounds in the vicinity of a metal-insulator transition

1978 ◽  
Vol 11 (3) ◽  
pp. L99-L102 ◽  
Author(s):  
F A Chudnovskii
Keyword(s):  
Transition Metal ◽  
Metallic Phase ◽  
Insulator Transition ◽  
Transition Metal Compounds ◽  
Metal Insulator Transition ◽  
Metal Insulator ◽  
Metal Compounds

Metal-insulator transition in 3d transition-metal oxides with ABO3 and A2BO4 type structures

1991 ◽  
Vol 185-189 ◽  
pp. 1295-1296 ◽  
Author(s):  
H. Eisaki ◽  
T. Ido ◽  
K. Magoshi ◽  
M. Mochizuki ◽  
H. Yamatsu ◽  
...  
Keyword(s):  
Transition Metal ◽  
Metal Oxides ◽  
Transition Metal Oxides ◽  
Insulator Transition ◽  
Metal Insulator Transition ◽  
Metal Insulator

METAL-INSULATOR TRANSITION AND FRÖHLICH CONDUCTIVITY IN THE SU-SCHRIEFFER-HEEGER MODEL

1996 ◽  
Vol 10 (18) ◽  
pp. 855-861 ◽  
Author(s):  
KRISTEL MICHIELSEN ◽  
HANS DE RAEDT
Keyword(s):  
Particle Density ◽  
Metallic Phase ◽  
Insulator Transition ◽  
Quantum Molecular Dynamics ◽  
Metal Insulator Transition ◽  
Metal Insulator ◽  
Single Particle Density ◽  
Half Filling ◽  
Drude Weight ◽  
Ssh Model

A quantum molecular dynamics technique is used to study the single-particle density of states, Drude weight, optical conductivity and flux quantization in the Su-Schrieffer-Heeger (SSH) model. Our simulation data show that the SSH model has a metal-insulator transition away from half-filling. In the metallic phase the electron transport is collective and shows the features characteristic of Fröhlich conductivity.

scholarly journals ORBITAL INSULATORS AND ORBITAL ORDER–DISORDER INDUCED METAL–INSULATOR TRANSITION IN TRANSITION-METAL OXIDES

2007 ◽  
Vol 21 (05) ◽  
pp. 691-706 ◽  
Author(s):  
DONG-MENG CHEN ◽  
LIANG-JIAN ZOU
Keyword(s):  
Transition Metal ◽  
Metal Oxides ◽  
Transition Metal Oxides ◽  
Thermal Fluctuation ◽  
Insulator Transition ◽  
Orbital Ordering ◽  
Excitation Spectra ◽  
Metal Insulator Transition ◽  
Orbital Order ◽  
Metal Insulator

The role of orbital ordering on metal–insulator transition in transition-metal oxides is investigated by the cluster self-consistent field approach in the strong correlation regime. A clear dependence of the insulating gap of single-particle excitation spectra on the orbital order parameter is found. The thermal fluctuation drives the orbital order–disorder transition, diminishes the gap and leads to the metal–insulator transition. The unusual temperature dependence of the orbital polarization in the orbital insulator is also manifested in the resonant X-ray scattering intensity.

Phase transformation induced modulation of the resonance frequency of VO2/tio2 coated microcantilevers

MRS Advances ◽  
2018 ◽  
Vol 3 (6-7) ◽  
pp. 359-364 ◽  
Author(s):  
Ryan McGee ◽  
Ankur Goswami ◽  
Rosmi Abraham ◽  
Syed Bukhari ◽  
Thomas Thundat
Keyword(s):  
Tensile Stress ◽  
Resonance Frequency ◽  
Mechanical Response ◽  
Electrical Response ◽  
Deposition Process ◽  
Metallic Phase ◽  
Insulator Transition ◽  
Detection Methods ◽  
Metal Insulator Transition ◽  
Metal Insulator

AbstractHere we present an investigation into the phase change mechanism and detection methods of the metal-insulator transition of vanadium dioxide (VO2). We are able to detect the onset of the phase transition, and track it to completion using both the mechanical and electrical response by depositing VO2/TiO2 layers onto microcantilever devices by pulsed laser deposition. The resonance frequency of v-shaped cantilevers was shown to increase by up to 41 % upon deposition of VO2 as detected by laser Doppler vibrometry. Such a large increase in resonance frequency is ascribed to high tensile stress imparted onto the cantilever during the deposition process. The insulator-metal transition manifested as a 5 % increase in the resonance frequency as a result of lattice compression, resulting in additional tensile stress in the more ordered metallic phase. Electrically, the transition was confirmed by over three orders magnitude decrease in resistance upon heating past the transition. The metal-insulator transition was measured with an accuracy of a few °C when comparing the two methods, however, the transition was much sharper in the mechanical response.

Simultaneous Spectroscopic, Diffraction and Microscopic Study of the Metal-Insulator Transition of VO2

2015 ◽  
Vol 1730 ◽  
Author(s):  
J. Laverock ◽  
S. Kittiwatanakul ◽  
A. A. Zakharov ◽  
Y. R. Niu ◽  
B. Chen ◽  
...  
Keyword(s):  
Microscopic Study ◽  
Metallic Phase ◽  
Insulator Transition ◽  
Low Energy ◽  
Energy Electron ◽  
Electron Microscopic ◽  
Metal Insulator Transition ◽  
Metal Insulator ◽  
Rutile Structure ◽  
Low Energy Electron

ABSTRACTWe present a simultaneous photoemission spectroscopic, low-energy electron diffraction and low-energy electron microscopic study of the metal-insulator transition of strained VO2. The fraction of rutile structure is extracted from the microscopic measurements throughout the transition, and compared with the fraction of the metallic electrons from photoemission data. We find that at intermediate temperatures, while the system is predominantly monoclinic-like in structure, the electronic component of the transition is much further advanced. Our results provide direct evidence for a monoclinic-like metallic phase of VO2 that is easily accessible at ambient temperatures and pressures.

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