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Chen, C. T.
Zhang, C. Q.
<p>We investigate the temperature (T)-dependent low-energy electronic structure of a boron-doped diamond thin film using ultrahigh resolution laser-excited photoemission spectroscopy. We observe a clear shift of the leading edge below T=11 K, indicative of a superconducting gap opening (Delta~0.78 meV at T=4.5 K). The gap feature is significantly broad and a well-defined quasiparticle peak is lacking even at the lowest temperature of measurement (=4.5 K). We discuss our results in terms of disorder effects on the normal state transport and superconductivity in this system.</p>
Digital Object Identifier: 10.1103/PhysRevLett.98.047003
Published with permission from the copyright holder. This is the institute's copy, as published in Physical Review Letters, 23 January 2007, 98, 047003, Pages 1-4.
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PACS: 74.62.Dh, 73.61.Cw, 74.90.+n, 79.60.-i
Copyright © 2007 American Physical Society. All rights reserved.
Physical Review Letters