A ‘checkerboard’ electronic crystal state in lightly hole-doped Ca2-xNaxCuO2Cl2.
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| Title: | A ‘checkerboard’ electronic crystal state in lightly hole-doped Ca |
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| Authors: | Hanagud, T., Luplen, C., Kohsaka, Y., Lee, D.-H., Azuma, M., Takano, M., Takagl, H., Davis, J. C. |
| Source: | Nature. 8/26/2004, Vol. 430 Issue 7003, p1001-1005. 5p. |
| Subjects: | Phase diagrams, Copper, Oxides, Spectrum analysis, Electronic structure, Superconductors |
| 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’ regime. This regime is rich in peculiar electronic phenomena, 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| < 100?meV, the spectrum exhibits a V-shaped energy gap centred on E = 0. States within this gap undergo intense spatial modulations, with the spatial correlations of a four CuO2-unit-cell square ‘checkerboard’, independent of energy. Intricate atomic-scale electronic structure variations also exist within the checkerboard. These data are consistent with an unanticipated crystalline electronic state, possibly the hidden electronic order, existing in the zero-temperature pseudogap regime of Ca2-xNaxCuO2Cl2. [ABSTRACT FROM AUTHOR] |
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| Database: | Psychology and Behavioral Sciences Collection |
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