RT Journal Article
T1 Evidence for vortex tunnel dissipation in deoxygenated YBa_(2)Cu_(3)O_(6.4) thin films
A1 Sefrioui, Zouhair
A1 Arias Serna, Diego
A1 Morales, F.
A1 Varela Del Arco, María
A1 León Yebra, Carlos
A1 Escudero, R.
A1 Santamaría Sánchez-Barriga, Jacobo
AB 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.
PB American Physical Society
SN 0163-1829
YR 2001
FD 2001-01-01
LK https://hdl.handle.net/20.500.14352/59642
UL https://hdl.handle.net/20.500.14352/59642
LA eng
NO © 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.
NO Agencia Española de Cooperación Internacional (AECI)
NO CICYT
NO DGSCAUNAM
NO CONACyT- MEXICO
DS Docta Complutense
RD 8 abr 2025