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- W1640307309 abstract "The paraconductivities and excess Hall conductivities of ${mathrm{YBa}}_{2}{mathrm{Cu}}_{3}{mathrm{O}}_{7ensuremath{-}x} (mathrm{YBCO})$ films and ${mathrm{YBa}}_{2}{mathrm{Cu}}_{3}{mathrm{O}}_{7ensuremath{-}x}/{mathrm{PrBa}}_{2}{mathrm{Cu}}_{3}{mathrm{O}}_{7ensuremath{-}x} (mathrm{Y}mathrm{B}mathrm{C}mathrm{O}/mathrm{P}mathrm{B}mathrm{C}mathrm{O})$ superlattices at temperatures above ${T}_{c}$ are measured and analyzed within the framework of fluctuation theories. We observe that the fluctuation contributions to the paraconductivity of YBCO/PBCO superlattices are governed by the Lawrence and Doniach process and the dimensionality is characterized by the coupling parameter ensuremath{alpha}, which is temperature dependent. However, the contributions of fluctuation to the excess Hall effect contain the negative Aslamazov-Larkin (AL) term and the positive Maki-Thompson (MT) term. Especially, the positive MT contributions for YBCO/PBCO superlattices suggest that the pair-breaking interaction is important when T is close ${T}_{c}.$ The scaling of the paraconductivities in the presence of magnetic fields suggests that the YBCO/PBCO superlattices belong to the quasi-two-dimensional (quasi-2D) systems and the anisotropic parameter $ensuremath{gamma}{=m}_{mathrm{ab}}{/m}_{c}$ governs the dimensionality. With a smaller value of ensuremath{gamma}, a 2D-like scaling of the paraconductivities is obtained. On the other hand, in the scaling of the excess Hall conductivities, only the AL terms separated from the total conductivities follow a scaling law, while the MT terms do not. The results are discussed." @default.
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- W1640307309 date "1999-06-01" @default.
- W1640307309 modified "2023-09-23" @default.
- W1640307309 title "Paraconductivity and excess Hall conductivity inYBa2Cu3O7−x/PrBa2Cu3O7−xsuperlattices" @default.
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- W1640307309 doi "https://doi.org/10.1103/physrevb.59.14031" @default.
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