Metal-insulator transition and superconductivity in Y1Ba2Cu3O7-x

Budhani, R. C. ; Tzeng, Sing-Mo H. ; Bunshah, R. F. (1987) Metal-insulator transition and superconductivity in Y1Ba2Cu3O7-x Physical Review B, 36 (16). pp. 8873-8876. ISSN 0163-1829

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The oxygen concentration in the Y1Ba2Cu3O7-xsuperconducting compound has been changed by subjecting it to rapid quenching from temperatures in the range 500-1000 °C. The lower oxygen concentration destroys the superconductivity, causes removal of the orthorhombic distortion in the perovskite structure and results in a metal-insulator (m-I) transition. The presence of variable range hopping conductivity and thermopower in the insulating regime strongly suggests that the m-I transition is of anderson type. The results in general are understood in terms of the relative overlap between dz2 and dx2-γ2 components of the eg band of the octahedrally coordinated copper atoms.

Item Type:Article
Source:Copyright of this article belongs to American Physical Society.
ID Code:5612
Deposited On:19 Oct 2010 11:45
Last Modified:23 May 2011 07:32

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