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High Energy Resolution Arpes Measurements of the Normal and Superconducting States of Bi2Sr2CaCu2O8+δ

Published online by Cambridge University Press:  15 February 2011

D. S. Dessau ,
Z.-X. Shen ,
D. M. King ,
B. O. Wells ,
D. S. Marshall ,
L. W. Lombardo ,
P. H. Dickinson ,
J. Dicarlo ,
C.-H. Park  and
A. G. Loeser
...Show all authors
D. S. Dessau
Affiliation:
Solid State Laboratories, Stanford University, Stanford, CA 94305-4055 and Stanford Synchrotron Radiation Labs, Stanford, CA 94305
Z.-X. Shen
Affiliation:
Solid State Laboratories, Stanford University, Stanford, CA 94305-4055 and Stanford Synchrotron Radiation Labs, Stanford, CA 94305 Dept of Applied Physics, Stanford Univ., Stanford, CA 94305
D. M. King
Affiliation:
Solid State Laboratories, Stanford University, Stanford, CA 94305-4055 and Stanford Synchrotron Radiation Labs, Stanford, CA 94305
B. O. Wells
Affiliation:
Solid State Laboratories, Stanford University, Stanford, CA 94305-4055 and Stanford Synchrotron Radiation Labs, Stanford, CA 94305
D. S. Marshall
Affiliation:
Solid State Laboratories, Stanford University, Stanford, CA 94305-4055 and Stanford Synchrotron Radiation Labs, Stanford, CA 94305
L. W. Lombardo
Affiliation:
Dept of Applied Physics, Stanford Univ., Stanford, CA 94305
P. H. Dickinson
Affiliation:
Dept of Applied Physics, Stanford Univ., Stanford, CA 94305
J. Dicarlo
Affiliation:
Solid State Laboratories, Stanford University, Stanford, CA 94305-4055 and Stanford Synchrotron Radiation Labs, Stanford, CA 94305
C.-H. Park
Affiliation:
Solid State Laboratories, Stanford University, Stanford, CA 94305-4055 and Stanford Synchrotron Radiation Labs, Stanford, CA 94305
A. G. Loeser
Affiliation:
Solid State Laboratories, Stanford University, Stanford, CA 94305-4055 and Stanford Synchrotron Radiation Labs, Stanford, CA 94305
A. Kapitulnik
Affiliation:
Dept of Applied Physics, Stanford Univ., Stanford, CA 94305
W. E. Spicer
Affiliation:
Solid State Laboratories, Stanford University, Stanford, CA 94305-4055 and Stanford Synchrotron Radiation Labs, Stanford, CA 94305
A. J. Arko
Affiliation:
Los Alamos National Laboratory, Los Alamos, NM 87545
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Abstract

The near-EF electronic structure and Fermi surface of Bi2212 has been mapped out with ARPES. A key feature of our measured bandstructure is the existence of an extended region of flat CuO2-derived bands at EF. Comparative analysis of this data with that from NdCeCuO and YBCO7 suggests that many of the anomalous (normal) physical properties of Bi2212 and YBCO7 (NdCeCuO) may be related to the existence (absence) of such bands at EF. Superconducting gap anisotropy at least an order of magnitude larger than that of the conventional superconductors has been observed in the a-b plane of Bi2212 in ARPES. For samples with Tc of 88K, the gap size reaches a maximum of approximately 20 meV along the Cu-O bond direction, and a minimum of much smaller or vanishing magnitude 45° away. The experimental data is discussed within the context of various theoretical models. In particular, a detailed comparison with what is expected from a superconductor with a dx2-y2 order parameter is carried out, yielding a consistent picture.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 307: Symposium L – Applications of Synchrotron Radiation Techniques to Materials Science , 1993 , 187
Copyright
Copyright © Materials Research Society 1993

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References

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