Elliptical hole pockets in the Fermi surfaces of unhydrated and hydrated sodium cobalt oxides

J. Laverock; S. B. Dugdale; J. A. Duffy; J. Wooldridge; G. Balakrishnan; M. R. Lees; G. Q. Zheng; D. Chen; C. T. Lin; A. Andrejczuk; M. Itou; Y. Sakurai

doi:10.1103/PhysRevB.76.052509

Elliptical hole pockets in the Fermi surfaces of unhydrated and hydrated sodium cobalt oxides

J. Laverock, S. B. Dugdale, J. A. Duffy, J. Wooldridge, G. Balakrishnan, M. R. Lees, G. Q. Zheng, D. Chen, C. T. Lin, A. Andrejczuk, M. Itou, Y. Sakurai

Research output: Contribution to journal › Article › peer-review

32 Citations (Scopus)

Abstract

The surprise discovery of superconductivity below 5 K in sodium cobalt oxides when hydrated with water has caught the attention of experimentalists and theorists alike. Most explanations for its occurence have focused heavily on the properties of some small elliptically shaped pockets predicted to be the electronically dominant Fermi surface sheet, but direct attempts to look for them have instead cast serious doubts over their existence. Here we present evidence that these pockets do indeed exist, based on bulk measurements of the electron momentum distribution in unhydrated and hydrated sodium cobalt oxides using the technique of x-ray Compton scattering.

Original language	English
Article number	052509
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	76
Issue number	5
DOIs	https://doi.org/10.1103/PhysRevB.76.052509
Publication status	Published - Aug 22 2007

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1103/PhysRevB.76.052509

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Laverock, J., Dugdale, S. B., Duffy, J. A., Wooldridge, J., Balakrishnan, G., Lees, M. R., Zheng, G. Q., Chen, D., Lin, C. T., Andrejczuk, A., Itou, M., & Sakurai, Y. (2007). Elliptical hole pockets in the Fermi surfaces of unhydrated and hydrated sodium cobalt oxides. Physical Review B - Condensed Matter and Materials Physics, 76(5), [052509]. https://doi.org/10.1103/PhysRevB.76.052509

Laverock, J, Dugdale, SB, Duffy, JA, Wooldridge, J, Balakrishnan, G, Lees, MR, Zheng, GQ, Chen, D, Lin, CT, Andrejczuk, A, Itou, M & Sakurai, Y 2007, 'Elliptical hole pockets in the Fermi surfaces of unhydrated and hydrated sodium cobalt oxides', Physical Review B - Condensed Matter and Materials Physics, vol. 76, no. 5, 052509. https://doi.org/10.1103/PhysRevB.76.052509

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AU - Balakrishnan, G.

AU - Lees, M. R.

AU - Zheng, G. Q.

AU - Chen, D.

AU - Lin, C. T.

AU - Andrejczuk, A.

AU - Itou, M.

AU - Sakurai, Y.

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Elliptical hole pockets in the Fermi surfaces of unhydrated and hydrated sodium cobalt oxides

Abstract

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