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Evidence of doping-dependent pairing symmetry in cuprate superconductors

Yeh, N.-C. and Chen, C.-T. and Hammerl, G. and Mannhart, J. and Schmehl, A. and Schneider, C. W. and Schulz, R. R. and Tajima, S. and Yoshida, K. and Garrigus, D. and Strasik, M. (2001) Evidence of doping-dependent pairing symmetry in cuprate superconductors. Physical Review Letters, 87 (8). Art. No. 087003. ISSN 0031-9007.

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Scanning tunneling spectroscopy studies reveal long-range spatial homogeneity and predominantly d(x2)-(y2)-pairing spectral characteristics in under- and optimally doped YBa2Cu3O7-delta superconductors, whereas STS on YBa2(Cu0.9934Zn0.0026Mg0.004)(3)O-6.9 exhibits microscopic spatial modulations and strong scattering near the Zn or Mg impurity sites, together with global suppression of the pairing potential. In contrast, in overdoped (Y0.7Ca0.3)Ba2Cu3O7-delta, (d(x2)-(y2) + s)-pairing symmetry is found, suggesting significant changes in the superconducting ground state at a critical doping value.

Item Type:Article
Additional Information:©2001 The American Physical Society. Received 11 December 2000; published 3 August 2001. The work at Caltech was supported by NSF Grant #DMR-9705171, at University of Augsburg by BMBF Grant #13N6918/1, and at SRL by the New Energy and Industrial Technology Development Organization as Collaborative Research and Development of Fundamental Technologies for Superconductivity Applications. We thank Professor Asle Sudbø and Dr. C. C. Tsuei for useful comments and stimulating discussions.
Subject Keywords:high-temperature superconductors, d-wave superconductors, tunneling spectroscopy, single-crystals, bound-states, BI2SR2CACU2O8+DELTA, pseudogap, gap, excitations, YBA2CU3O7-X
Record Number:CaltechAUTHORS:YEHprl01
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:880
Deposited By: Tony Diaz
Deposited On:03 Nov 2005
Last Modified:18 Sep 2014 18:10

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