Anisotropy and directional pinning in YBaCuO with BaZrO3 nanorods

Abstract

Measurements of anisotropic transport properties (dc and high-frequency regime) of driven vortex matter in YBa${}_2$Cu${}_3$O${}_{7-x}$ with elongated strong-pinning sites (c-axis aligned, self-assembled BaZrO${}_3$ nanorods) are used to demonstrate that the effective-mass angular scaling takes place only in intrinsic physical quantities (flux-flow resistivity), and not in pinning-related Labusch parameter and critical currents. Comparison of the dynamics at different time scales shows evidence for a transition of the vortex matter toward a Mott phase, driven by the presence of nanorods. The strong pinning in dc arises partially from a dynamic effect.

4 pages, 4 figures. Accepted for publication on Applied Physics Letters. With respect to v1: changed title, slightly shortened

References in corpus (7)

• Strongly Enhanced Current Densities in Superconducting Coated Conductors of YBa2Cu3O7-x + BaZrO3
• Reliable determination of vortex parameters from measurements of the microwave complex resistivity
• Strong reduction of field-dependent microwave surface resistance in YBa${}_2$Cu${}_3$O${}_{7-\delta }$ with sub-micrometric BaZrO${}_3$ inclusions
• Near-isotropic performance of intrinsically anisotropic high-temperature superconducting tapes due to self-assembled nanostructures
• Reduction of the field-dependent microwave surface resistance in YBa_2Cu_3O_7 with sub-micrometric BaZrO_3 inclusions as a function of BaZrO_3 concentration
• Angular dependence of the high-frequency vortex response in YBa${}_2$Cu${}_3$O${}_{7-x}$ thin film with self-assembled BaZrO${}_3$ nanorods
• Transition from columnar to point pinning in coated conductors: critical currents, that are independent of magnetic field direction

Cited by in corpus (8)

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• Intrinsic Anisotropy and Pinning Anisotropy in Nanostructured YBa${}_2$Cu${}_3$O${}_{7-\delta }$ from Microwave Measurements
• Pinning properties of FeSeTe thin film through multifrequency measurements of the surface impedance
• Directional pinning and anisotropy in YBa2Cu3O7-x with BaZrO3 nanorods: intrinsic and nanorods-induced anisotropy
• ${}^4$He sample probe for combined microwave and dc transport measurements
• Analysis of the measurements of anisotropic a.c. vortex resistivity in tilted magnetic fields
• Pinning, flux flow resistivity and anisotropy of Fe(Se,Te) thin films from microwave measurements through a bitonal dielectric resonator
• Vortex pinning and flux flow microwave studies of coated conductors