We performed Point Contact Andreev Reflection Spectroscopy experiments on Pr(1-x)Lace(x)CuO(4-y) crystals. The variety of the measured spectra are all explained in terms of a modified BTK model considering a d-wave symmetry of the superconducting order parameter. We give an estimation of the energy gap Delta = (3.5 +/- 0.2) meV and of the ratio 2 Delta/k(B)T(c) similar or equal to 3.6 +/- 0.3. We measured the temperature evolution of the dl/dV vs. V characteristics and we extracted a conventional BCS temperature dependence of the superconducting energy gap. Finally, in order to explain the conductance spectra showing higher voltage gap-like features we consider a model in which the formation of a Josephson junction in series with the Point Contact junction is realized due to the tip pressure. (C) 2010 Elsevier B.V. All rights reserved.
Study of the pairing symmetry in the electron-doped cuprate Pr(1-x)LaCe(x)CuO(4-y) by tunneling spectroscopy
PIANO, SAMANTA;SCARFATO, Alessandro;BOBBA, Fabrizio;DI BARTOLOMEO, Antonio;CUCOLO, Anna Maria
2010-01-01
Abstract
We performed Point Contact Andreev Reflection Spectroscopy experiments on Pr(1-x)Lace(x)CuO(4-y) crystals. The variety of the measured spectra are all explained in terms of a modified BTK model considering a d-wave symmetry of the superconducting order parameter. We give an estimation of the energy gap Delta = (3.5 +/- 0.2) meV and of the ratio 2 Delta/k(B)T(c) similar or equal to 3.6 +/- 0.3. We measured the temperature evolution of the dl/dV vs. V characteristics and we extracted a conventional BCS temperature dependence of the superconducting energy gap. Finally, in order to explain the conductance spectra showing higher voltage gap-like features we consider a model in which the formation of a Josephson junction in series with the Point Contact junction is realized due to the tip pressure. (C) 2010 Elsevier B.V. All rights reserved.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
