Proximity-effect and resistance magneto-fluctuations measurements in submicron Nd1.2Ba1.8Cu3Oz (NBCO) nano-loops are reported to investigate coherent charge transport in the non-superconducting state. We find an unexpected inhibition of cooper pair transport, and a destruction of the induced superconductivity, by lowering the temperature from 6K to 250mK. This effect is accompanied by a significant change in the conductance-voltage characteristics and in the zero bias conductance response to the magnetic field pointing to the activation of a strong pair breaking mechanism at lower temperature. The data are discussed in the framework of mesoscopic effects specific to superconducting nanostructures, proximity effect and high temperature superconductivity.
@article{arxiv.1207.4976,
title = {Coherent transport in extremely underdoped Nd1.2Ba1.8Cu3Oz nanostructures},
author = {Franco Carillo and Gabriella Maria De Luca and Domenico Montemurro and Gianpaolo Papari and Marco Salluzzo and Daniela Stornaiuolo and Francesco Tafuri and Fabio Beltram},
journal= {arXiv preprint arXiv:1207.4976},
year = {2012}
}