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American Physical Society, Physical Review Letters, 20(101)

DOI: 10.1103/physrevlett.101.207002

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Coexistence of Competing Orders with Two Energy Gaps in Real and Momentum Space in the High Temperature SuperconductorBi2Sr2−xLaxCuO6+δ

This paper is available in a repository.
This paper is available in a repository.

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Data provided by SHERPA/RoMEO

Abstract

Through a combined scanning tunneling microscopy and angle-resolved photoemission spectroscopy study, we report the observation of two distinct gaps (a small and a large gap) that coexist both in real space and in the antinodal region of momentum space, below the superconducting transition temperature (T_{c}) of Bi_{2}Sr_{2-x}La_{x}CuO_{6+delta}. We show that the small gap is associated with superconductivity. The large-gap persists above T_{c}, and seems linked to observed charge ordering. We find a strong correlation between the large and small gaps suggesting that they are affected by similar physical processes.