Vortex dynamics and states of artificially layered superconducting films with correlated defects

Andreas Engel; H. J. Trodahl

doi:10.1103/PhysRevB.66.184505

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Vortex dynamics and states of artificially layered superconducting films with correlated defects

Andreas Engel, H. J. Trodahl

DOI 10.1103/PhysRevB.66.184505 · Physical Review B

T1

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Abstract

Resistances and IV characteristics have been measured over a wide range in the parameter space of the mixed phase of multilayered a−TaxGe1−x/Ge films. Three films with varying interlayer coupling and correlated defects oriented at an angle ≈25° from the film normal were investigated. Experimental data were analyzed within vortex glass models and a second-order phase transition from a resistive vortex liquid to a pinned glass phase. Various vortex phases including changes from three- to two-dimensional behavior depending on anisotropy have been identified. Careful analysis of IV characteristics in the glass phases revealed a distinctive T and H dependence of the glass exponent μ. The vortex dynamics in the Bose-glass phase does not follow the predicted behavior for excitations of vortex kinks or loops.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Ta0.3Ge0.7/Ge Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Ta32Ge68/Ge Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	2.4	Pressure not reported	unknown
Ta35Ge65/Ge Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	2.21	Pressure not reported	unknown
Ta37Ge63/Ge Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	2.27	Pressure not reported	unknown
YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Bi2Sr2CaCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown