Physics – Condensed Matter – Superconductivity
Scientific paper
2008-03-06
Phys. Rev. B 80, 104518 (2009)
Physics
Condensed Matter
Superconductivity
13 pages and 12 figures
Scientific paper
10.1103/PhysRevB.80.104518
We have studied the normal-to-superconducting phase transition in optimally-doped YBa$_2$Cu$_3$O$_{7-\delta}$ in zero external magnetic field using a variety of different samples and techniques. Using DC transport measurements, we find that the dynamical critical exponent $z=1.54\pm0.14$, and the static critical exponent $\nu=0.66\pm0.10$ for both films (when finite-thickness effects are included in the data analysis) and single crystals (where finite-thickness effects are unimportant). We also measured thin films at different microwave frequencies and at different powers, which allowed us to systematically probe different length scales to avoid finite-thickness effects. DC transport measurements were also performed on the films used in the microwave experiments to provide a further consistency check. These microwave and DC measurements yielded a value of z consistent with the other results, $z=1.55\pm0.15$. The neglect of finite-thickness, finite-current, and finite-frequency effects may account for the wide ranges of values for $\nu$ and $z$ previously reported in the literature.
Ando Yoichi
Anlage Steven M.
Li Su
Lobb C. J.
Segawa Kouji
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