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- W2012078413 abstract "Abstract In this paper, we report the positron lifetime data in high- T c cuprate perovskite YBa 2 Cu 3− x M x O y (M=Al, Sn) systems with different dopant concentration x . A significant substitution dependence of the positron lifetime parameters was observed, and the local electron density n e and defect concentration C v were also evaluated as a function of substitution content x . The results show that in the region of known structural transition from orthorhombic to tetragonal phase, n e and C v present an large anomalous change. Here, n e is decreased and C v increases. These can be interpreted by electronic weak localization in Cu–O chains and would affect on the charge transfer in superconducting state. The mechanisms of positron annihilation were also discussed." @default.
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- W2012078413 date "1998-05-01" @default.
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- W2012078413 title "Local electronic density and vacancy properties for YBa2Cu3−xMxOy (M=Al, Sn) ceramic materials" @default.
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- W2012078413 doi "https://doi.org/10.1016/s0167-577x(97)00262-0" @default.
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