Evidence of s-Wave Subdominant Order Parameter in YBCO from Break Junction Tunneling Spectra
Superconductivity
2007-05-23 v2
Abstract
The tunneling spectra of YBa2Cu3O7 break-junctions have been investigated for the tunneling direction close to the node one. The zero-bias conductance peak (ZBCP) and Josephson current have been studied with temperature and magnetic field. The observed deep splitting of ZBCP which starts at Ts<20-30K is in agreement with the theory for the dx2-y2+-is order parameter [Y. Tanuma, Y. Tanaka, and S. Kashiwaya, Phys. Rev. B 64, 214519 (2001)]. The low (0.04T) magnetic field depresses significantly such splitting. The 1/T temperature dependence of maximum Josephson current goes to saturation at T<Ts also confirming the mixed order parameter formation.
Keywords
Cite
@article{arxiv.cond-mat/0606552,
title = {Evidence of s-Wave Subdominant Order Parameter in YBCO from Break Junction Tunneling Spectra},
author = {A. I. Akimenko and F. Bobba and F. Giubileo and V. Gudimenko and A. Scarfato and A. M. Cucolo},
journal= {arXiv preprint arXiv:cond-mat/0606552},
year = {2007}
}
Comments
4 pages, 4 figures