scholarly journals Metal-insulator transition, spin gap generation, and charge ordering in geometrically frustrated electron systems

2003 ◽  
Vol 67 (23) ◽  
Author(s):  
Satoshi Fujimoto
Keyword(s):  
Charge Ordering ◽  
Insulator Transition ◽  
Electron Systems ◽  
Metal Insulator Transition ◽  
Metal Insulator ◽  
Spin Gap ◽  
Geometrically Frustrated

scholarly journals Identification of a monoclinic metallic state in VO2 from a modified first-principles approach

2019 ◽  
Vol 33 (12) ◽  
pp. 1950148
Author(s):  
Yongcheng Liang ◽  
Ping Qin ◽  
Zhiyong Liang ◽  
Lizhen Zhang ◽  
Xun Yuan ◽  
...  
Keyword(s):  
First Principles ◽  
Lattice Distortion ◽  
Insulator Transition ◽  
Metallic State ◽  
Strongly Correlated ◽  
Electron Systems ◽  
First Principles Calculations ◽  
Monoclinic Structure ◽  
Metal Insulator Transition ◽  
Metal Insulator

Metal-insulator transition (MIT) underlies many remarkable and technologically important phenomena in VO2. Even though its monoclinic structure had before been the reserve of the insulating state, recent experiments have observed an unexpected monoclinic metallic state. Here, we use a modified approach combining first-principles calculations with orbital-biased potentials to reproduce the correct stability ordering and electronic structures of different phases of VO2. We identify a ferromagnetic monoclinic metal that is likely to be the experimentally observed mysterious metastable state. Furthermore, the calculations show that an isostructural insulator-metal electronic transition is followed by the lattice distortion from the monoclinic structure to the rutile one. These results not only explain the experimental observations of the monoclinic metallic state and the decoupled structural and electronic transitions of VO2, but also provide a useful understanding for the metal-insulator transition in other strongly correlated d electron systems.

QUANTUM CRITICAL BEHAVIOUR IN THE INSULATING REGION OF THE 2D METAL INSULATOR TRANSITION

2006 ◽  
Vol 20 (30n31) ◽  
pp. 5229-5238
Author(s):  
DAVID NEILSON ◽  
D. J. WALLACE GELDART
Keyword(s):  
Critical Region ◽  
Insulator Transition ◽  
Critical Dynamics ◽  
Two Dimensional ◽  
Electron Systems ◽  
Dimensional Electron ◽  
Metal Insulator Transition ◽  
Metal Insulator ◽  
New Information ◽  
Quantum Critical

We show the insulating region of the metal-insulator transition phenomena in disordered two-dimensional electron systems contains new information about the quantum critical dynamics at low T because the insulating region and the quantum critical region are two aspects of the localized phase.

Charge ordering driven metal-insulator transition in the layered cobaltiteHoBaCo2O5.5

2009 ◽  
Vol 80 (15) ◽  
Author(s):  
Lorenzo Malavasi ◽  
Michela Brunelli ◽  
Yuri Diaz-Fernandez ◽  
Bholanath Pahari ◽  
Piercarlo Mustarelli
Keyword(s):  
Charge Ordering ◽  
Insulator Transition ◽  
Metal Insulator Transition ◽  
Metal Insulator
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