RT Journal Article
T1 Crossover from a three-dimensional to purely two-dimensional vortex-glass transition in deoxygenated YBa_(2)Cu_(3)O_(7-δ) thin films
A1 Sefrioui, Zouhair
A1 Arias Serna, Diego
A1 Villegas, J. E.
A1 Varela Del Arco, María
A1 López de la Torre, M. A.
A1 León Yebra, Carlos
A1 Loos, G. D.
A1 Santamaría Sánchez-Barriga, Jacobo
AB Current-voltage (I-V) characteristics were used to investigate the response of the vortex-glass (VG) phase transition in high-quality epitaxial YBa_(2)Cu_(3)O_(7-δ) films in magnetic fields up to 7 T. We show that varying the oxygen content, the scaling analysis reveals a crossover from three-dimensional (3D) to a pure 2D VG transition with T_(g) = 0. At small oxygen deficiencies (7-δ = 6.75), the ρ-j curves scale according to the 3D VG model, which cannot be distinguished from a Bose-glass model from a scaling analysis with the magnetic field applied parallel to the c axis. At a lower oxygen content (7-δ = 6.48), the VG phase transition behaves analogous to the highly anisotropic Bi_(2)Sr_(2)CaCu_(2)O_(8) samples, showing a quasi-2D VG transition. For further deoxygenated samples (7-δ = 6.4), the result is consistent with a pure 2D vortex-glass model similar to that observed in the even more anisotropic Tl_(2)Ba_(2)CaCu_(2)O_(8) thin films. The estimated value of the anisotropy in high-quality oxygen-depleted samples is comparable to that of the highly anisotropic superconductors.
PB American Physical Society
SN 1098-0121
YR 1999
FD 1999-12-01
LK https://hdl.handle.net/20.500.14352/59648
UL https://hdl.handle.net/20.500.14352/59648
LA eng
NO © 1999 The American Physical Society. Z.S. gratefully acknowledges financial support from Agencia Española de Cooperación International (AECI). G.D.L. thanks the sabbaticals SA 106/95 SAB1995-0685 to Universidad Complutense and Ministerio de Educación y Cultura. Financial support from CICYT Grant No. MAT94- 0604 is also acknowledged. We thank Professor J. L. Vicent for helpful discussions.
NO Agencia Española de Cooperación International (AECI)
NO Universidad Complutense
NO Ministerio de Educación y Cultura
NO CICYT
DS Docta Complutense
RD 6 abr 2025