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Science 8 October 1999:
Vol. 286. no. 5438, pp. 268 - 272
DOI: 10.1126/science.286.5438.268
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Reports
One-Dimensional Electronic Structure and Suppression of d-Wave Node State in (La1.28Nd0.6Sr0.12)CuO4
X. J. Zhou,
1,2
P. Bogdanov,
1
S. A. Kellar,
1
T. Noda,
3
H. Eisaki,
3
S. Uchida,
3
Z. Hussain,
2
Z.-X. Shen
1*
Angle-resolved photoemission spectroscopy was carried out on
(La1.28Nd0.6
Sr0.12)CuO4, a model system of the charge- and
spin-ordered state, or stripe phase. The electronic structure contains
characteristic features consistent with other cuprates, such as the
flat band at low energy near the Brillouin zone face. However, the
low-energy excitation near the expected d-wave node region
is strongly suppressed. The frequency-integrated spectral weight is
confined inside one-dimensional segments in the momentum space (defined
by horizontal momenta  kx =  /4 and
vertical momenta ky = /4), deviating
strongly from the more rounded Fermi surface expected from band
calculations. This departure from the two-dimensional Fermi surface
persists to a very high energy scale. These results provide important
information for establishing a theory to understand the charge and spin
ordering in cuprates and their relation with high-temperature
superconductivity.
1 Department of Physics, Applied Physics and
Stanford Synchrotron Radiation Laboratory, Stanford University,
Stanford, CA 94305, USA.
2 Advanced Light Source,
Lawrence Berkeley National Lab, Berkeley, CA 94720, USA.
3 Department of Superconductivity, University of
Tokyo, Yayoi 2-11-16, Bunkyo-ku, Tokyo 133, Japan.
*
To whom correspondence should be addressed. E-mail:
zxshen{at}stanford.edu
Read the Full Text
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