Field-dependent resistive transitions in Yba2Cu3O7-δ thin films: Influence of the pseudogap on vortex dynamics

doi:10.1088/1674-1056/24/1/017402

Abstract The nature of resistive transition of high-quality crystalline thin films of Yba₂Cu₃O_7-δ has been studied under magnetic fields (H) applied along the c direction over a wide range of doped holes, p, in the CuO₂ planes. The field- and temperature-dependent in-plane resistivity, ρ_ab(T,H), has been analyzed within the thermally assisted flux-flow (TAFF) formalism. The flux activation energy, U(T,H), has been extracted from this analysis. The low-T part of the ρ_ab(T,H) data can be described by an activation energy having the functional form of U(T,H) = (1-t)^m(H₀/H)^-β, where t = T/T_c (reduced temperature), and H₀ is a field scale that primarily determines the magnitude of U(T,H). The temperature exponent, m, shows a systematic variation with p, whereas the field exponent, β, is insensitive to the p values and is close to unity. The H₀, on the other hand, changes rapidly as p is varied. U(T,H) is linked to the pinning potential and consequently on the superconducting condensation energy. Since the normal state pseudogap directly affects superconducting condensation energy, a clear correspondence between H₀ and the PG energy scale, ε_g, is found. Possible implications of these results are discussed.

Keywords: Y123 superconductors thermally assisted flux-flow model activation energy pseudogap

Received: 05 June 2014
Revised: 25 November 2014
Accepted manuscript online:

PACS:	74.25.Uv	(Vortex phases (includes vortex lattices, vortex liquids, and vortex glasses))
	74.62.Dh	(Effects of crystal defects, doping and substitution)
	74.72.Ek	(Electron-doped)
	74.25.Dw	(Superconductivity phase diagrams)

Corresponding Authors: S H Naqib
E-mail: salehnaqib@yahoo.com

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S H Naqib, R S Islam Field-dependent resistive transitions in Yba₂Cu₃O_7-δ thin films: Influence of the pseudogap on vortex dynamics 2015 Chin. Phys. B 24 017402

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Field-dependent resistive transitions in Yba2Cu3O7-δ thin films: Influence of the pseudogap on vortex dynamics

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Field-dependent resistive transitions in Yba₂Cu₃O_7-δ thin films: Influence of the pseudogap on vortex dynamics