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- W44463068 abstract "The magnetic phase diagram of ${mathrm{YBa}}_{2}$${mathrm{Cu}}_{3}$${mathrm{O}}_{7mathrm{ensuremath{-}}mathrm{ensuremath{delta}}}$ thin films was studied as a function of anisotropy by systematically changing the oxygen stoichiometry (ensuremath{delta} value). For small ensuremath{delta} values the vortex-solid phase transition boundary ${mathit{H}}_{mathit{g}}$(T) is observed over the full accessible field range (50 kOe) to follow the (1-T/${mathit{T}}_{mathit{c}}$${)}^{mathrm{ensuremath{sim}}1.5}$ dependence that is expected for an anisotropic superconductor in the three-dimensional regime. As ensuremath{delta} increases, a portion of the phase boundary no longer follows the (1-T/${mathit{T}}_{mathit{c}}$${)}^{mathrm{ensuremath{sim}}1.5}$ dependence making it possible to identify the anisotropy-dependent dimensional crossover field ${mathit{H}}_{0}$ at which the system begins to behave quasi-two-dimensionally. Plotting ${mathit{H}}_{mathit{g}}$(T) normalized by ${mathit{H}}_{0}$ as a function of (1-T/${mathit{T}}_{mathit{c}}$) results in a collapse of the phase boundaries onto a single universal curve. Using published values of the anisotropy ensuremath{gamma}=8.5 and the upper critical field slope ${mathit{dH}}_{mathit{c}2}$/dT=-20 kOe/K it is possible to determine the specific relation ${mathit{H}}_{0}$ensuremath{approxeq}1.2${mathrm{ensuremath{varphi}}}_{0}$/(${mathit{d}}^{2}$${ensuremath{gamma}}^{2}$), where d is the multilayer spacing, which can be used to determine the ensuremath{delta} dependence of ensuremath{gamma}." @default.
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- W44463068 date "1995-01-01" @default.
- W44463068 modified "2023-09-23" @default.
- W44463068 title "Dimensional crossover field as a function of oxygen stoichiometry inYBa2Cu3O7−δthin films" @default.
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- W44463068 doi "https://doi.org/10.1103/physrevb.51.705" @default.
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