scholarly journals Universality of the metal-insulator transition in three-dimensional disordered systems

2006 ◽  
Vol 74 (15) ◽  
Author(s):  
J. Brndiar ◽  
P. Markoš
Keyword(s):  
Disordered Systems ◽  
Three Dimensional ◽  
Insulator Transition ◽  
Metal Insulator Transition ◽  
Metal Insulator

scholarly journals Three-dimensional electronic structures and the metal-insulator transition in Ruddlesden-Popper iridates

2016 ◽  
Vol 94 (11) ◽  
Author(s):  
A. Yamasaki ◽  
H. Fujiwara ◽  
S. Tachibana ◽  
D. Iwasaki ◽  
Y. Higashino ◽  
...  
Keyword(s):  
Electronic Structures ◽  
Three Dimensional ◽  
Insulator Transition ◽  
Metal Insulator Transition ◽  
Metal Insulator

Correlations Between Physical and Crystallographic Parameters in the (Bi, Pb)2Sr2 (Ca, Y)Cu2O8+δ Superconductors

1998 ◽  
Vol 12 (29n31) ◽  
pp. 3306-3312 ◽  
Author(s):  
Laurent Manifacier ◽  
Gaston Collin ◽  
Nicole Blanchard
Keyword(s):  
Hole Concentration ◽  
Three Dimensional ◽  
Covalent Bonding ◽  
Insulator Transition ◽  
Type Ii ◽  
Two Dimensional ◽  
Metal Insulator Transition ◽  
Metal Insulator ◽  
Internal Parameters ◽  
Hole Localization

Systematic studies of the lead and yttrium substituted Bi-2212 phase were performed on various compositions ranging between 0 and 0.8 for Pb and between 0 and 0.9 for Y. Crystallographic measurements reveal that the two modulations observed in unleaded and highly Pb-substituted samples are closely linked, the main differences being that the commensurate component disappears in type II (lead type) modulation, along with the modulation of the Bi 3+ ion. We argue that this is due to a covalent bonding between Bi-O planes. The study of internal parameters, including modulation amplitudes, of the Bi2Sr2 ( Ca 1-x, Y x) Cu2O 8+x/2+δ system reveals three distinct regimes with very different behaviors, corresponding to the overdoped, underdoped and insulating regimes. By comparing these results to the variation of the diamagnetic shielding with Y and Pb contents, we conclude that yttrium and lead affect more the mobility of the holes than the hole concentration itself. Y seems to induce, rather than a metal/insulator transition, a switch from a three-dimensional to a two-dimensional regime with a hole localization in the CuO 2 planes.

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