We investigated the temperature dependence of the longitudinal and transverse conductivity of Y 1−z Pr z Ba 2 Cu 3 O 7−δ single crystals with different praseodymium contents. The correlation between the experimental results and the predictions of various theoretical models was analyzed. It is observed that the increase of the praseodymium concentration in Y 1−z Pr z Ba 2 Cu 3 O 7−δ single crystals leads to increased localization effects and suppression of the superconducting state. Interestingly, for single crystals with large praseodymium content the anisotropy of the normal electrical resistivity ρ c /ρ ab (T) is described by the universal 'law of 1/2' for thermally activated hopping conductivity. This is in contrast to the case for comparable crystals of YBa 2 Cu 3 O 7−δ .
An original spatially resolved approach is demonstrated for spin-wave spectroscopy of individual circular magnetic elements. It allows for the deduction of the saturation magnetization and the exchange stiffness of the material with high precision.
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