Doping Controlled Superconductor-Insulator Transition in Bi2Sr2-xLaxCaCu2O8+delta

Details Doping Controlled Superconductor-Insulator Transition in Bi2Sr2-xLaxCaCu2O8+delta Doping Controlled Superconductor-Insulator Transition in Bi2Sr2-xLaxCaCu2O8+delta

2005-09-20

arxiv.org/abs/cond-mat/0509521v4

PRL 96, 107003 (2006)

Physics

Condensed Matter

Superconductivity

21 pages, 5 figures, abstract changed. Introduction and conclusion expanded. Slight changes in the main text. Accepted to PRL

Scientific paper

10.1103/PhysRevLett.96.107003

We show that the doping-controlled superconductor-insulator transition (SIT) in a high critical temperature cuprate system (Bi2Sr2-xLaxCaCu2O8+delta) exhibits a fundamentally different behavior than is expected from conventional SIT. At the critical doping, the sheet resistance seems to diverge in the zero temperature limit. Above the critical doping, the transport is universally scaled by a two-component conductance model. Below, it continuously evolves from weakly to strongly insulating behavior. The two-component conductance model suggests that a collective electronic phase separation mechanism may be responsible for this unconventional SIT behavior.

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