Coherent transport in extremely underdoped Nd1.2Ba1.8Cu3Oz   nanostructures
  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. 
Franco Carillo, Gabriella Maria De Luca, Domenico Montemurro,   Gianpaolo Papari, Marco Salluzzo, Daniela Stornaiuolo, Franc...
cond-mat.supr-con cond-mat.mes-hall cond-mat.str-el