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|Title:||EXCESS CONDUCTIVITY AND PAIR-BREAKING EFFECTS IN YBA2CU3O7 AND BI2SR2CA1-XYXCU2O8+DELTA SYSTEMS|
|Publisher:||AMERICAN PHYSICAL SOC|
|Citation:||PHYSICAL REVIEW B, 49(17), 12206-12215|
|Abstract:||To explain the behavior of thermal fluctuations, we have measured the electrical resistivity of five samples: thin-film YBa2Cu3O7, Polycrystalline YBa2Cu3O7, and Bi2Sr2Ca1-xYxCu2O8+delta with x = 0, 0.05, and 0.20. The whole temperature range of fluctuations consists of three regions. Within the mean-field region, YBa2Cu3O7 and Bi2Sr2Ca1-xYxCu2O8-delta samples show predominantly three-dimensional (3D) and 2D behaviors with the exponents 1/2 and 1, in the critical region the two systems display a behavior analogous to 3D-XY and 2D-XY models, respectively. Above the mean-field region [ln(epsilon) greater-than-or-equal-to -1.0] exponents have values larger than those predicted by Reggiani et al. Both the systems favor strong pair-breaking effects and integral dimensions for the thermal fluctuations.|
|Appears in Collections:||Article|
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