Non-Ohmic electrical transport properties in YBa<sub>2</sub>Cu<sub>3</sub>O<sub>6+x</sub> at various doping levels

Author(s)
Georg Zechner, Ionut Puica, Wolfgang Lang, Khurram Siraj, Johannes D. Pedarnig
Abstract

Recent experiments with underdoped high-Tc superconductors, like Nernst effect and sensitive diamagnetism measurements, as well as novel angle resolved photoemission data have revealed signatures that resemble those of a superconducting gap at temperatures well above Tc. However, the onset temperature of these effects does not coincide with the previously discovered, so-called pseudo-gap temperature T* that can be found with a variety of other physical probes. These partially contradicting experimental findings and their intensively discussed theoretical interpretations demonstrate vividly the need for additional experimental probes. We explore a novel experimental approach, the investigation of resistivity and Hall effect in the normal state of YBa2Cu3O6+x (YBCO) beyond the weak electric field limit.

For thin films of YBCO from strongly underdoped to optimally doped we have investigated the in-plane longitudinal and transverse (Hall) conductivities in intense currents. We found a pronounced non-ohmic Hall conductivity in underdoped samples that extends far above Tc. The onset temperature of this effect as a function of doping is discussed with respect to the onset of Nernst effect and to T*.

Organisation(s)
Electronic Properties of Materials
Publication date
09-2013
Publication status
Published
Austrian Fields of Science 2012
103009 Solid state physics
Keywords
SUPERCONDUCTIVITY
Portal url
https://ucris.univie.ac.at/portal/en/publications/nonohmic-electrical-transport-properties-in-yba2cu3o6x-at-various-doping-levels(f9bab4e8-e57f-478d-a2f3-53eb784cd6cf).html