A ‘checkerboard’ electronic crystal state in lightly hole-doped Ca2-xNaxCuO2Cl2

T. Hanaguri (), C. Lupien, Y. Kohsaka, D.-H. Lee, M. Azuma, M. Takano, H. Takagi and J. C. Davis ()
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T. Hanaguri: RIKEN (Institute of Physical and Chemical Research)
C. Lupien: Cornell University
Y. Kohsaka: University of Tokyo
D.-H. Lee: University of California
M. Azuma: Japan Science and Technology Agency
M. Takano: Kyoto University
H. Takagi: RIKEN (Institute of Physical and Chemical Research)
J. C. Davis: Cornell University

Nature, 2004, vol. 430, issue 7003, 1001-1005

Abstract: Abstract The phase diagram of hole-doped copper oxides shows four different electronic phases existing at zero temperature. Familiar among these are the Mott insulator, high-transition-temperature superconductor and metallic phases. A fourth phase, of unknown identity, occurs at light doping along the zero-temperature bound of the ‘pseudogap’ regime1. This regime is rich in peculiar electronic phenomena1, prompting numerous proposals that it contains some form of hidden electronic order. Here we present low-temperature electronic structure imaging studies of a lightly hole-doped copper oxide: Ca2-xNaxCuO2Cl2. Tunnelling spectroscopy (at energies |E| > 100 meV) reveals electron extraction probabilities greatly exceeding those for injection, as anticipated for a doped Mott insulator. However, for |E|

Date: 2004
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DOI: 10.1038/nature02861

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