Change of universality class of metal–insulator transition due to magnetic ordering

1999 ◽  
Vol 85 (8) ◽  
pp. 5332-5334 ◽  
Author(s):  
N. A. de Oliveira ◽  
M. V. Tovar Costa ◽  
A. Troper ◽  
Gloria M. Japiassú ◽  
M. A. Continentino
Keyword(s):  
Magnetic Ordering ◽  
Universality Class ◽  
Insulator Transition ◽  
Metal Insulator Transition ◽  
Metal Insulator

scholarly journals METAL–INSULATOR TRANSITION IN 3D QUANTUM PERCOLATION

2008 ◽  
Vol 22 (29) ◽  
pp. 5217-5227 ◽  
Author(s):  
IGOR TRAVĚNEC
Keyword(s):  
Geometric Mean ◽  
Finite Size ◽  
Universality Class ◽  
Insulator Transition ◽  
Metal Insulator Transition ◽  
Mobility Edge ◽  
Metal Insulator ◽  
The Difference ◽  
Transition Study ◽  
Energy Plane

We present the metal–insulator transition study of a quantum site percolation model on simple cubic lattice. Transfer matrix method is used to calculate transport properties — Landauer conductance — for the binary distribution of energies. We calculate the mobility edge in disorder (ratio of insulating sites) — energy plane in detail and we find the extremal critical disorder somewhat closer to the classical percolation threshold than formerly reported. We calculate the critical exponent ν along the mobility edge and find it constant and equal to the one of 3D Anderson model, confirming common universality class. Possible exception is the center of the conduction band, where either the single-parameter scaling is not valid anymore, or finite size effects are immense. One of the reasons for such statement is the difference between results from arithmetic and geometric averaging of conductance at special energies. Only the geometric mean yields zero critical disorder in band center, which was theoretically predicted.

scholarly journals Suppression of metal-insulator transition at high pressure and pressure-induced magnetic ordering in pyrochlore oxide Nd2Ir2O7

2011 ◽  
Vol 83 (4) ◽  
Author(s):  
Masafumi Sakata ◽  
Tomoko Kagayama ◽  
Katsuya Shimizu ◽  
Kazuyuki Matsuhira ◽  
Seishi Takagi ◽  
...  
Keyword(s):  
High Pressure ◽  
Magnetic Ordering ◽  
Insulator Transition ◽  
Metal Insulator Transition ◽  
Metal Insulator ◽  
Pyrochlore Oxide

Magnetic Ordering and Relation to the Metal-Insulator Transition inPr1−xSrxMnO3andNd1−xSrxMnO3withx∼1/2

1997 ◽  
Vol 78 (22) ◽  
pp. 4253-4256 ◽  
Author(s):  
H. Kawano ◽  
R. Kajimoto ◽  
H. Yoshizawa ◽  
Y. Tomioka ◽  
H. Kuwahara ◽  
...  
Keyword(s):  
Magnetic Ordering ◽  
Insulator Transition ◽  
Metal Insulator Transition ◽  
Metal Insulator
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