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

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

2007-08-23

arxiv.org/abs/0708.3133v1

Physical Review B 76, 052509 (2007)

Physics

Condensed Matter

Superconductivity

Scientific paper

10.1103/PhysRevB.76.052509

The surprise discovery of superconductivity below 5K 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.

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