Universidad Complutense de Madrid
E-Prints Complutense

Evidence for vortex tunnel dissipation in deoxygenated YBa_(2)Cu_(3)O_(6.4) thin films

Impacto

Downloads

Downloads per month over past year

Sefrioui, Zouhair and Arias Serna, Diego and Morales, F. and Varela del Arco, María and León Yebra, Carlos and Escudero, R. and Santamaría Sánchez-Barriga, Jacobo (2001) Evidence for vortex tunnel dissipation in deoxygenated YBa_(2)Cu_(3)O_(6.4) thin films. Physical review B, 63 (5). ISSN 0163-1829

[img]
Preview
PDF
68kB

Official URL: http://dx.doi.org/10.1103/PhysRevB.63.054509


URLURL Type
http://journals.aps.org/Publisher


Abstract

We report on transport and magnetic relaxation measurements of deoxygenated YBa_(2)Cu_(3)O_(7-δ) thin films. Strongly oxygen depleted samples with δ=0.6 are produced to ensure the pure two-dimensional nature of the vortex system. Linear resistivity shows a temperature dependence according to ρ_(lin^(α))exp[-((T_(0)/T)^(p)]. T_(0) takes a value of 230±10 K over the whole field range, and p changes from 1±0.03 at 2 T to 0.70±0.03 at 8 T. For fields higher than 4 T, dissipation in the linear regime (low current densities) is dominated by quantum variable range hopping ~VRH! of vortices. At high current densities and low temperatures, nonlinear dissipation takes place by quantum creep, characterized by a temperature-independent resistivity and by a saturation of the magnetic relaxation rate.


Item Type:Article
Additional Information:

© 2001 The American Physical Society. Z.S. gratefully acknowledges financial support from Agencia Española de Cooperación Internacional (AECI). Financial support from CICYT Grant Nos. MAT94-0604, MAT97-0675, and MAT99-1706E is also acknowledged. F.M. and R.E. acknowledge financial support from DGSCAUNAM and CONACyT- MEXICO.

Uncontrolled Keywords:Ultrathin superconducting films; Glass phase-transition; Quantum creep; Magnetic-relaxation; II superconductors; T-G=0 K; Vortices; Transport.
Subjects:Sciences > Physics > Electricity
Sciences > Physics > Electronics
ID Code:31157
Deposited On:01 Jul 2015 10:16
Last Modified:10 Dec 2018 14:58

Origin of downloads

Repository Staff Only: item control page