期刊
PHYSICAL REVIEW B
卷 84, 期 1, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.84.014518
关键词
-
资金
- NRF of Korea [KRF-2007-314-C00075, 2009-0081204, 2011-0018306]
- NSF [DMR10-1006184]
- Office of Science, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering, US DOE [DE-AC02-05CH11231]
- NSF
- BES DMSE
We study underdoped high-T-c superconductors YBa2Cu3O6.5 and YBa2Cu4O8 using first-principles pseudopotential methods with additional Coulomb interactions at the Cu atoms and obtain Fermi-surface pocket areas in close agreement with measured Shubnikov-de Haas and de Haas-van Alphen oscillations. With antiferromagnetic order in CuO2 planes, stable in the calculations, small hole pockets are formed near the so-called Fermi-arc positions in the Brillouin zone, which reproduce the low-frequency oscillations. A large electron pocket, necessary for the negative Hall coefficient, is also formed in YBa2Cu3O6.5, giving rise to the high-frequency oscillations as well. Effective masses and specific heats are also calculated. Our results highlight the important role of magnetic order in the electronic structure of underdoped high-T-c superconductors.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据