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Session Q09 - HTSC: STRUCTURES AND DEFECTS
Mixed session, Friday morning, March 24, 8:00
Ballroom A5, San Jose Convention Center
Although persistant photoconductivity in oxygen deficient and superconducting YBa _2 Cu _3 O _6+x has been experimentally observed by various groups, V. I. Kudinov et. al, Phys Rev. B 47, 9017 (1993); G. Nieva et. al, Phys. Rev. B 46, 14249 (1992) the mechanism which is responsible for the persistant photoconductivity is still under debate. The possiblity of a defect-related mechanism in laser-deposited thin films of YBa _2 Cu _3 O _6+x is studied using electrical and optical techniques. Recent experimental and theoretical results will be presented.