期刊
PHYSICAL REVIEW B
卷 76, 期 14, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.76.140508
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资金
- Engineering and Physical Sciences Research Council [EP/C511778/1] Funding Source: researchfish
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.
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