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Crossover from a three-dimensional to purely two-dimensional vortex-glass transition in deoxygenated YBa_(2)Cu_(3)O_(7-δ) thin films



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Sefrioui, Zouhair and Arias Serna, Diego and Varela del Arco, María and Villegas, J. E. and López de la Torre, M. A. and León Yebra, Carlos and Loos, G. D. and Santamaría Sánchez-Barriga, Jacobo (1999) Crossover from a three-dimensional to purely two-dimensional vortex-glass transition in deoxygenated YBa_(2)Cu_(3)O_(7-δ) thin films. Physical review B, 60 (22). pp. 15423-15429. ISSN 1098-0121


Official URL: http://dx.doi.org/10.1103/PhysRevB.60.15423



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.

Item Type:Article
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© 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.

Uncontrolled Keywords:High-temperature superconductors; Lattice-melting transition; Solid phase-transition; Thermal fluctuations; II superconductors; Boson localization; Universality; Resistivity; Transport; Disorder.
Subjects:Sciences > Physics > Electricity
Sciences > Physics > Electronics
ID Code:31184
Deposited On:01 Jul 2015 10:39
Last Modified:10 Dec 2018 14:58

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