We studied La1.85Sr0.15CUO4-delta single crystals by tunneling spectroscopy both in planar and in break junction configurations. In the c-axis oriented planar junctions, with natural barriers and evaporated Pb film counterelectrodes, we observed at low-temperature gap-like structures around +/- 7-10 meV. In the a, b oriented break junctions we found conductance structures at +/- 15-20 mV, an increasing background at high biases and a conductance peak at zero voltage. The presence of this peak can be interpreted in terms of d-wave component for the order parameter in this material. (C) 2000 Published by Elsevier Science B.V. All rights reserved.
Observation of gap structures in La1.85Sr0.15CuO4-delta single crystals by tunneling spectroscopy
BOBBA, Fabrizio;CUCOLO, Anna Maria;
2000-01-01
Abstract
We studied La1.85Sr0.15CUO4-delta single crystals by tunneling spectroscopy both in planar and in break junction configurations. In the c-axis oriented planar junctions, with natural barriers and evaporated Pb film counterelectrodes, we observed at low-temperature gap-like structures around +/- 7-10 meV. In the a, b oriented break junctions we found conductance structures at +/- 15-20 mV, an increasing background at high biases and a conductance peak at zero voltage. The presence of this peak can be interpreted in terms of d-wave component for the order parameter in this material. (C) 2000 Published by Elsevier Science B.V. All rights reserved.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
