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Kitzler, T.
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article
Non-ohmic electrical transport properties above the critical temperature in optimally and underdoped superconducting YBa2Cu3O6+x
Abstract
The resistivity and the Hall effect as a function of current density and temperature in the normal state of very thin films of YBa<sub>2</sub>Cu<sub>3</sub>O<sub>6+x </sub>are measured with a fast pulsed-current technique. The in-plane longitudinal and transverse (Hall) conductivities are reduced in intense current densities up to several . In optimally-doped samples, this non-ohmic effect is limited to temperatures below 100 K. In a moderately underdoped sample, however, the non-linearity extends to the temperature range from <i>T</i><sub>c</sub> =53 K to similar to 150 K. The non-linear part of the Hall conductivity does not scale with a critical exponent, thus excluding classical amplitude fluctuations of the superconducting order parameter as possible origin.