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-11 torr. LEED experiments were performed to check the surface structure, yielding the expected four-fold symmetry. The Nd-LSCO sample was grown with the traveling floating zone method. The same class of samples has been used for neutron-scattering experiments (3).
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0345538328
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note
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y cuts.
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0345538326
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note
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Here the "occupied" area means that the occupation probability is high. In an interacting system, n(k) will not be zero even in the region where the "band" is above the Fermi level.
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From the outset, we note that this gapping effect is not caused by the extrinsic loss mechanism suggested recently [R. Joynt, Science 284, 777 (1999)], which cannot explain the angular dependence of the gap. In this case, the smallest gap is 5 meV or less, further suggesting that the extrinsic loss mechanism is not an issue here.
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0345538319
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note
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y| = 0.15π result is a good indicator of the gap.
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44
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0345538322
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note
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We thank E. D. Lu, J. Denlinger, J. Bozek, and D. H. Lu for technical support and S. A. Kivelson, J. Zaanen, R. B. Laughlin, D. van der Marel, A. Fujimori, H. Fukuyama, C. D. Castro, W. Hanke, and J. M. Tranquada for helpful comments. The experiment was performed at the Advanced Light Source of the Lawrence Berkeley National Laboratory, which is operated by the U.S. Department of Energy's Office of Basic Energy Science, Division of Material Science. The division also provided support for the Stanford Synchrotron Radiation Laboratory experimental effort and end-station development through grant DE-FG03-96ER45594. The Stanford University work was also supported by NSF grant DMR-9705210.
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