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



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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

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


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
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© 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

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