Abstract
The introduction of holes in a parent compound consisting of copper oxide layers results in high-temperature superconductivity. It is also possible to dope the cuprate parent compound with electrons1,2,3. The physical properties of these electron-doped materials bear some similarities to but also significant differences from those of their hole-doped counterparts. Here, we use a recently developed first-principles method4 to study the electron-doped cuprates and elucidate the deep physical reasons behind their behaviour being so different from that of the hole-doped materials. The crystal structure of the electron-doped compounds is characterized by a lack of apical oxygens, and we find that it results in a parent compound that is a Slater insulator—a material in which the insulating behaviour is the result of the presence of magnetic long-range order. This is in sharp contrast with the hole-doped materials, which are insulating owing to the strong electronic correlations but not owing to magnetism.
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Acknowledgements
We thank A. M. Tremblay, D. Basov, D. G. Hawthorn and G. A. Sawatzky for discussions and sharing their insights and experimental data. Discussions with A. Georges, A. Amaricci, J. C. Domenge and A. Millis are acknowledged. J-C. Dommenge shared his exact diagonalization code. K.H was supported by Grant NSF NFS DMR-0746395 and the Alfred P. Sloan foundation. G.K. was supported by NSF DMR-0906943, and C.W. was supported by the Swiss National Science Foundation (SNSF).
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C.W., K.H. and G.K. conceived the research; C.W. carried out numerical calculations; C.W. and K.H. contributed theoretical numerical codes; C.W. analysed the data; C.W., K.H. and G.K. wrote the paper; G.K. supervised the whole project.
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Weber, C., Haule, K. & Kotliar, G. Strength of correlations in electron- and hole-doped cuprates. Nature Phys 6, 574–578 (2010). https://doi.org/10.1038/nphys1706
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DOI: https://doi.org/10.1038/nphys1706
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