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

被引：31
作者：
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.
机构：
[1] Univ Bristol, HH Wills Phys Lab, Bristol BS8 1TL, Avon, England
[2] Univ Warwick, Dept Phys, Coventry CV4 7AL, W Midlands, England
[3] Okayama Univ, Dept Phys, Okayama 7008530, Japan
[4] Univ Wollongong, ISEM, Wollongong, NSW 2522, Australia
[5] SPring 8, Japan Synchrotron Radiat Res Inst, Sayo, Hyogo 6795198, Japan
来源：
PHYSICAL REVIEW B | 2007年 / 76卷 / 05期
基金：
英国工程与自然科学研究理事会;
关键词：
D O I：
10.1103/PhysRevB.76.052509
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
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.
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页数：4
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