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【期刊论文】Superconducting Gap and Strong In-Plane Anisotropy in Untwinned YBa2Cu3O7-δ
封东来, D.
PHYSICAL REVIEW LETTERS VOLUME 86, NUMBER 19, Y MAY., 2001,-0001,():
-1年11月30日
With significantly improved sample quality and instrumental resolution, we clearly identify in the (π,0) photoemission spectra from YBa2Cu3O6.993, in the superconducting state, the long-sought “peakdip-hump” structure. This advance allows us to investigate the large a-b anisotropy of the in-plane electronic structure including, in particular, a 50% difference in the magnitude of the superconducting gap that scales with the energy position of the hump feature. This anisotropy, likely induced by the presence of the CuO chains, raises serious questions about attempts to quantitatively explain the YBa2Cu3O7-δ data from various experiments using models based on a perfectly square lattice.
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封东来, R.
PHYSICAL REVIEW B 69, 220502 (R) (2004),-0001,():
-1年11月30日
A systematic analysis of the complex photoemmision spectrum line shape at (π,0) of heavily overdoped Bi2Sr2CaCu2O8+δ is presented. We show that a coherent component in the quasiparticle excitation is correlated with the superfluid density throughout the entire doping range and suggest it is a direct measure of the order parameter of high temperature superconductors
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封东来, D.L.
Journal of Physics and Chemistry of Solids 67 (2006) 198-200,-0001,():
-1年11月30日
We discuss the puzzles surrounding the interpretation of the 1/8 anomaly in cuprates, highlighting the tension between the real and reciprocal space ways to look at the problem. This issue is relevant to the current discussion on the nature of charge ordering in the form of ‘stripe' and ‘checker-board' as derived from neutron and STM experiments. A resolution of this tension is important to fully understand the electronic structure.
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【期刊论文】Bilayer Splitting in the Electronic Structure of Heavily Overdoped Bi2Sr2CaCu2O8+δ
封东来, D.
PHYSICAL REVIEW LETTERS VOLUME 86, NUMBER 24, 11 JUNE 2001,-0001,():
-1年11月30日
The electronic structure of heavily overdoped Bi2Sr2CaCu2O8+δ is investigated by angle-resolved photoemission spectroscopy. The long-sought bilayer band splitting in this two-plane system is observed in both normal and superconducting states, which qualitatively agrees with the bilayer Hubbard model calculations. The maximum bilayer energy splitting is about 88 meV for the normal state feature, while it is only about 20 meV for the superconducting peak.
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