Doping evolution of the electronic structure in the single-layer cuprates Bi2Sr2−xLaxCuO6 delta: Comparison with other single-layer cuprates Page: 1 of 8
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SLAC-PUB-14070
Doping evolution of the electronic structure in the single-layer cuprates
Bi2Sr2-,LaCuO6+s: Comparison with other single-layer cuprates
M. Hashimoto, T. Yoshida, H. Yagi, M. Takizawa, and A. Fujimori
Department of Physics, University of Tokyo, Hongo, Tokyo 113-0033, Japan
M. Kubota and K. Ono
Photon Factory, Institute of Materials Structure Science,
High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki, 305-0801, Japan
K. Tanaka, D.H. Lu, and Z.-X. Shen
Department of Physics, Applied Physics, and Stanford Synchrotron Radiation Laboratory,
Stanford University, Stanford, California 94305, U.S.A.
S. Ono
Central Research Institute of Electric Power Industry, Komae, Tokyo 201-8511, Japan.
Yoichi Ando
Institute of Scientific and Industrial Research, Osaka University, Ibaraki, Osaka 567-0047, Japan
(Dated: November 6, 2009)
We have performed angle-resolved photoemission and core-level x-ray photoemission studies of
the single-layer cuprate Bi2Sr2-LaxCuO6ms (Bi2201) and revealed the doping evolution of the elec-
tronic structure from the lightly-doped to optimally-doped regions. We have observed the formation
of the dispersive quasi-particle band, evolution of the Fermi "arc" into the Fermi surface and the
shift of the chemical potential with hole doping as in other cuprates. The doping evolution in Bi2201
is similar to that in Ca2-xNaxCuO2C2 (Na-CCOC), where a rapid chemical potential shift toward
the lower Hubbard band of the parent insulator has been observed, but is quite different from that
in La2-xSrxCuO4 (LSCO), where the chemical potential does not shift, yet the dispersive band
and the Fermi arc/surface are formed around the Fermi level already in the lightly-doped region.
The (underlying) Fermi surface shape and band dispersions are quantitatively analyzed using tight-
binding fit, and the deduced next-nearest-neighbor hopping integral t' also confirm the similarity to
Na-CCOC and the difference from LSCO.I. INTRODUCTION
How the electronic structure of the antiferromagnetic
insulator evolves into that of the superconductor with
hole doping in the high-T, cuprates has been a major
and fundamental issue in condensed-matter physics. In
the doping range where the insulator-to-superconductor
transition occurs, dramatic changes occur in the thermo-
dynamic and transport properties1,2,3,45, and exotic phe-
nomena such as the pseudogap6'7, Fermi "arc"8,9,10,11
stripe order12,13 and 4ax4a order9'14 have been reported.
So far systematic angle-resolved photoemission
(ARPES) studies on the doping evolution from
the lightly-doped to underdoped regions have been
performed only for the two single-layer cuprate
families La2-xSrxCuO4 (LSCO)8,15,16,17,18 and
Ca2-xNaxCuO2Cl2 (Na-CCOC)9,16,17,19,20,21. These
studies have revealed several common features such as
the evolution of the pseudogap in the antinodal region
and the Fermi "arc" in the nodal region. From these
studies combined with chemical potential shift measure-
ments using core-level photoemission spectroscopy22,23
two different kinds of doping evolution have emerged.
In LSCO, upon hole doping, the quasiparticle (QP)
peak immediately appears around the Fermi energy(EF) while the chemical potential p (namely, the EF
position) is pinned in the underdoped region. The
formation of such metallic dispersion with slight doping
in LSCO has been demonstrated by Sahrakorpi et
al.24. The lower Hubbard band (LHB) stays away
from p. In Na-CCOC, the chemical potential is shifted
toward the LHB upon hole doping and further doping
continues to lower the chemical potential into the LHB,
creating the QP band and the Fermi arc/surface. The
question of why LSCO and Na-CCOC exhibit such
contrasting behaviors has not been understood. It has
been suggested that the next-nearest-neighbor hopping
integral t' plays an important role in the different
band dispersions, Fermi surface shapes and chemical
potential shifts of LSCO and the double-layer cuprates
Bi2Sr2CuCu2Os+6 (Bi2212)25,26,27,28. In fact, different
t' values are fundamentally important to understand the
material dependences of the cuprates as theoretically
suggested26,28,29. In order to elucidate the origin of the
differences between LSCO and Na-CCOC and those
between LSCO and Bi2212, studies of other single-layer
cuprates that cover a wide doping range are necessary.
In this study, therefore, we have performed ARPES
and core-level x-ray photoemission (XPS) studies on
another single-layer cuprate system Bi2Sr2-xLaxCuO6+6SIMES, SLAC National Accelerator Center, 2575 Sand Hill Road, Menlo Park, CA 94309
Work supported in part by US Department of Energy contract DE-AC02-76SF00515.
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Hashimoto, M. Doping evolution of the electronic structure in the single-layer cuprates Bi2Sr2−xLaxCuO6 delta: Comparison with other single-layer cuprates, article, April 30, 2010; United States. (https://digital.library.unt.edu/ark:/67531/metadc929276/m1/1/: accessed May 11, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.