期刊
JOURNAL OF PHYSICS-CONDENSED MATTER
卷 35, 期 21, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/1361-648X/acc379
关键词
quantum oscillation; cuprate; STM; high-Tc; superconductor; high magnetic field; magnetic vortices
We investigated Bi2Sr2CaCu2O8+delta under a magnetic field in an atomic scale and found a particle-hole asymmetric density of states modulation in slightly underdoped samples, while no trace of the vortex was found in highly underdoped samples. However, a similar particle-hole asymmetric density of states modulation persisted in almost the entire field of view. This finding provides an alternative explanation for the quantum oscillations results.
Cuprate superconductors display unusual features in both k space and real space as the superconductivity is suppressed-a broken Fermi surface, charge density wave, and pseudogap. Contrarily, recent transport measurements on cuprates under high magnetic fields report quantum oscillations (QOs), which imply rather a usual Fermi liquid behavior. To settle the disagreement, we investigated Bi2Sr2CaCu2O8+delta under a magnetic field in an atomic scale. A particle-hole (p-h) asymmetrically dispersing density of states (DOSs) modulation was found at the vortices on a slightly underdoped sample, while on a highly underdoped sample, no trace of the vortex was found even at 13 T. However, a similar p-h asymmetric DOS modulation persisted in almost an entire field of view. From this observation, we infer an alternative explanation of the QO results by providing a unifying picture where the aforementioned seemingly conflicting evidence from angle-resolved photoemission spectroscopy, spectroscopic imaging scanning tunneling microscopy, and magneto-transport measurements can be understood solely in terms of the DOS modulations.
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