Excess voltage in the vicinity of the superconducting transition in inhomogeneous YBa2Cu3O7 thin films

Transverse voltage and chiral glass transition inYBa2Cu3O6+dSobociński1, Grande2, Pureur3 2014Physica C: Superconductivity and its Applications3050View full textAdd to dashboardCite

“…3 and 4 for samples Y2 and Y3, respectively, have been reported in HTSC and other superconductors [8][9][10]16,[12][13][14]. A quite well accepted interpretation for this behavior in V t invokes the occurrence of nonuniform current due to inhomogeneity along the transverse orientation of the film [10,12,14]. In order to check for this possibility for describing our results, we estimate the excess transverse voltage by subtracting the scaled longitudinal voltage from the V t data, that is…”

“…Its polarity may be either positive or negative with respect to that of the Hall effect. In general, the magnitude of dV xy as well as its temperature and field dependence are strongly sample dependent [12][13][14].…”

“…Thus, it has been proposed that effects from a nonuniform electrical current lead to a plausible explanation for the transverse voltage anomaly near T c in inhomogeneous superconducting samples [10,12,14,19]. Indeed, due to the sharp resistivity variation at T c , even minor deviations of the strict homogeneity in the orientation perpendicular to the current may produce sizeable dV xy [14].…”

Higher harmonics of ac voltage response in narrow strips of YBa2Cu3O7 thin films: evidence for strong thermal fluctuations

“…Using chemical etching and photolithographic techniques, the gold layer on each sample was partially removed and appropriately patterned to form a gold mask, consisting of a parallel array of golden fringes, each fringe being 100 microns wide and 100 microns apart from each other, similar to that used for non-local measurements [18], see Fig. 1.…”

“…1. Finally, and in contrast to the samples measured in [18], in the other direction perpendicular to the golden fringes, a parallel array of deep wrinkles was cut in order to create long, narrow YBCO-film strips of constant width, having on their surface a uniform sequence of golden electrodes available for electric contact, see Fig. 1.…”