Physics – Condensed Matter – Superconductivity
Scientific paper
2004-07-06
Phys. Rev. B 70, 140503(R) (2004
Physics
Condensed Matter
Superconductivity
4 pages, 2 figures
Scientific paper
10.1103/PhysRevB.70.140503
As a superconductor goes from the normal state into the superconducting state, the voltage vs. current characteristics at low currents change from linear to non-linear. We show theoretically and experimentally that the addition of current noise to non-linear voltage vs. current curves will create ohmic behavior. Ohmic response at low currents for temperatures below the critical temperature $T_c$ mimics the phase transition and leads to incorrect values for $T_c$ and the critical exponents $\nu$ and $z$. The ohmic response occurs at low currents, when the applied current $I_0$ is smaller than the width of the probability distribution $\sigma_I$, and will occur in both the zero-field transition and the vortex-glass transition. Our results indicate that the transition temperature and critical exponents extracted from the conventional scaling analysis are inaccurate if current noise is not filtered out. This is a possible explanation for the wide range of critical exponents found in the literature.
Frederiksen Thomas
Lobb C. J.
Ott R. A.
Repaci J. M.
Strachan†‡ Douglas R.
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