Band-structure calculations of Fermi-surface pockets in ortho-II YBa2Cu3O6.5

被引：45

作者：

Carrington, A. ^{[1
]}

Yelland, E. A. ^{[1
]}

机构：

[1] Univ Bristol, HH Wills Phys Lab, Bristol BS8 1TL, Avon, England

来源：

PHYSICAL REVIEW B | 2007年 / 76卷 / 14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.76.140508

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We explore whether the quantum oscillation signals recently observed in ortho-II YBa2Cu3O6.5 (OII-Y123) may be explained by conventional density-functional band-structure theory. Our calculations show that the Fermi surface of OII-Y123 is extremely sensitive to small shifts in the relative positions of the bands. With rigid band shifts of around +/- 30 meV small tubular pockets of Fermi surface develop around the Y point in the Brillouin zone. The cross-sectional areas and band masses of the quantum oscillatory orbits on these pockets are close to those observed. The differences between the band structure of OII-Y123 and YBa2Cu4O8 (Y124) are discussed with reference to the very recent observation of quantum oscillations in Y124.

引用

页数：4

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