Crossover from a three-dimensional to purely two-dimensional vortex-glass transition in deoxygenated YBa_(2)Cu_(3)O_(7-δ) thin films
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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DOI：
10.1103/physrevb.60.15423
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发表时间：
1999-12
影响因子：
3.7
通讯作者：
Z. Sefrioui;Diego Arias Serna;M. V. D. Arco;J. Villegas;M. A. L. L. Torre-M.-A.-L.-L.-Torre-73153080;C. Yebra;G. Loos;Jacobo Santamaría Sánchez-Barriga
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文献类型：
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作者：
Z. Sefrioui;Diego Arias Serna;M. V. D. Arco;J. Villegas;M. A. L. L. Torre-M.-A.-L.-L.-Torre-73153080;C. Yebra;G. Loos;Jacobo Santamaría Sánchez-Barriga
利用电流-电压（I-V）特性研究了高质量外延YBa_(2)Cu_(3)O_（7-δ）薄膜在高达7 t磁场下涡状玻璃（VG）相变的响应。结果表明，随着氧含量的变化，标度分析显示出从三维（3D）到纯二维（T_(g) = 0）的涡状玻璃相变的交叉。在低氧缺氧条件下（7-δ = 6.75）， ρ-j曲线符合三维VG模型，在平行于c轴施加磁场的标度分析中不能将其与玻色玻璃模型区分。在较低氧含量（7-δ = 6.48）下，VG的相变行为与高度各向异性的Bi_(2)Sr_(2)CaCu_(2)O_(8)样品相似，表现为准二维的VG相变。对于进一步脱氧的样品（7-δ = 6.4），结果与在更各向异性的Tl_(2)Ba_(2)CaCu_(2)O_(8)薄膜中观察到的纯二维涡-玻璃模型一致。高质量贫氧样品的各向异性估价值与高各向异性超导体的估价值相当。
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.