Muon Cat said:Can anyone provide a good reference which gives the G-L parameter for YBCO (a) along the ab-plane of the sample and (b) along the c-axis?
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The Ginzburg-Landau parameter for YBCO (yttrium barium copper oxide) is a dimensionless quantity that characterizes the superconducting behavior of this material. It is denoted by κ, and it is a measure of the strength of the superconducting pairing between electrons in YBCO.
The Ginzburg-Landau parameter for YBCO can be calculated using the following formula: κ = ξ/λ, where ξ is the coherence length and λ is the penetration depth. These values can be obtained through experimental measurements or theoretical calculations.
The Ginzburg-Landau parameter provides important information about the type of superconductivity present in YBCO. A value of κ greater than 1 indicates type-II superconductivity, while a value less than 1 indicates type-I superconductivity. This parameter also affects the critical temperature and critical magnetic field of YBCO.
The Ginzburg-Landau parameter influences the behavior of YBCO in magnetic fields. A higher value of κ results in a larger critical magnetic field, indicating that YBCO can withstand stronger magnetic fields while maintaining its superconducting state. This parameter also affects the vortex structure and pinning properties of YBCO.
Yes, the Ginzburg-Landau parameter can be used to compare YBCO with other superconductors. It provides a quantitative measure of the strength of superconductivity in different materials, allowing for comparison and analysis of their properties. However, it should be noted that the Ginzburg-Landau parameter is not the only factor that determines the superconducting behavior of a material.