Experimental evidence for a small s-wave component in the order parameter of underdoped

G. Koren; N. Levy

doi:10.1209/epl/i2002-00386-y

All issues

Volume 59 / No 1 (July 2002)

Europhys. Lett., 59 1 (2002) 121-127

Abstract

This article has an erratum: [https://doi.org/10.1209/epl/i2002-00131-8]

Issue		Europhys. Lett. Volume 59, Number 1, July 2002


Page(s)		121 - 127
Section		Condensed matter: electronic structure, electrical, magnetic, and optical properties
DOI		https://doi.org/10.1209/epl/i2002-00386-y
Published online		01 June 2002

Europhys. Lett., 59 (1), pp. 121-127 (2002)

Experimental evidence for a small s-wave component in the order parameter of underdoped ${\rm YBa}_2{\rm Cu}_3{\rm O}_{6+x}$

G. Koren and N. Levy

Physics Department, Technion-Israel Institute of Technology - Haifa, 32000, Israel

Corresponding author: gkoren@physics.technion.ac.il

Received: 31 January 2002
Accepted: 15 April 2002

Abstract

We report conductance measurements in underdoped ${\rm YBa}_2{\rm Cu}_3{\rm O}_{6+x}$ tunneling junctions of the ramp type, oriented along different directions in the ab plane. We find that the $d_{x^2-y^2}$ -wave gap is suppressed in the region near the node, but has a non-zero value of $\Delta=2.5\pm 0.3\un{mV}$ at the node. This result supports the existence of a sub-dominant is component in the order parameter of underdoped ${\rm YBa}_2{\rm Cu}_3{\rm O}_{6+x}$ .

PACS: 74.20.Rp – Pairing symmetries (other than s-wave) / 74.50.+r – Proximity effects, weak links, tunneling phenomena, and Josephson effects / 74.72.Bk – Y-based cuprates

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