Determination of the order parameter symmetry in hole and electron doped cuprate superconductors

Citation
L. Alff et al., Determination of the order parameter symmetry in hole and electron doped cuprate superconductors, PHYSICA B, 284, 2000, pp. 591-592
Citations number
14
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
PHYSICA B
ISSN journal
09214526 → ACNP
Volume
284
Year of publication
2000
Part
1
Pages
591 - 592
Database
ISI
SICI code
0921-4526(200007)284:<591:DOTOPS>2.0.ZU;2-W
Abstract
It is well established that the order parameter symmetry in the hole-doped high-temperature superconductors (HTS) is of d-wave type. For the electron- doped HTS one could expect to find the same order parameter symmetry becaus e both systems have the copper oxygen planes in common. However, our experi ments based on bicrystal grain boundary junctions (GBJs) show the absence o f zero energy Andreev bound states as well as a s-wave like temperature dep endence of the London penetration depth thereby excluding a d-wave symmetry of the order parameter in the electron-doped cuprates. At present, it is n ot fully established whether the electron-doped HTS have an isotropic or an anisotropic s-wave symmetry of the order parameter. (C) 2000 Elsevier Scie nce B.V. All rights reserved.