Measurement of an Anisotropic Energy Gap in Single Plane Bi{sub 2}Sr{sub 2{minus}{ital x}}La{sub {ital x}}CuO{sub 6+{delta}}
- Department of Applied Physics and Stanford Synchrotron Radiation Laboratory, Stanford University, Stanford, California 94305 (United States)
- Institute of Applied Physics and Cryogenics Center, University of Tsukuba, Tsukuba, Ibaraki 305 (Japan)
- Department of Superconductivity, The University of Tokyo, Yayoi 2-11-16, Bunkyo-ku, Tokyo 133 (Japan)
- National Laboratory for Superconductivity, Institute of Physics, Chinese Academy of Sciences, Beijing 100080 (China)
- Department of Physics, University of Colorado, Boulder, Colorado 80309-0390 (United States)
We report angle-resolved photoemission spectra both above and below T{sub c} in the single-plane cuprate superconductor Bi{sub 2}Sr{sub 2{minus}x}La{sub x}CuO{sub 6+{delta}}. The superconducting state measurements show a highly anisotropic excitation gap with a maximum magnitude smaller than that of the bilayer compound Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8} by a factor of 3. For a range of doping, the gap persists well above T{sub c}, behavior previously associated with underdoped bilayer cuprates. The anisotropy and magnitude of the normal-state gap are very similar to the superconducting state gap, indicating that the two gaps may have a common origin in a pairing interaction. {copyright} {ital 1997} {ital The American Physical Society}
- OSTI ID:
- 549689
- Journal Information:
- Physical Review Letters, Vol. 79, Issue 1; Other Information: PBD: Jul 1997
- Country of Publication:
- United States
- Language:
- English
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