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We report angle-resolved photoemission spectra both above and below T_c inthe single-plane cuprate superconductor Bi_2Sr_{2-x}La_xCuO_{6+d}. Thesuperconducting state measurements show a highly anisotropic excitation gapwith a maximum magnitude smaller than that of the bilayer compoundBi_2Sr_2CaCu_2O_8 by a factor of 3. For a range of doping, the gap persistswell above T_c, behavior previously associated with underdoped bilayercuprates. The anisotropy and magnitude of the normal-state gap are very similarto the superconducting state gap, indicating that the two gaps may have acommon origin in a pairing interaction.Comment: Revtex, 4 pages, 3 ps figure

physical review letters

Measurement of an Anisotropic Energy Gap in Single Plane<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi>Bi</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mi>Sr</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn><mml:mo>−</mml:mo><mml:mi mathvariant="italic">x</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi>La</mml:mi></mml:mrow><mml:mrow…

Measurement of an Anisotropic Energy Gap in Single PlaneBi2Sr2−xLa