Imaging the two gaps of the high-temperature superconductor Bi 2 Sr 2 CuO 6+ x
By M. Boyer, W. D. Wise, Kamalesh Chatterjee, M. Yi, Takeshi Kondo, T. Takeuchi, H. Ikuta, E. Hudson. 2007
195 citations recorded by the source corpus.
The nature and behaviour of electronic states in high-temperature superconductors are the centre of much debate. The pseudogap state, observed above the superconducting transition temperature, Tc, is seen by some as a precursor to the superconducting state. Others view it as a competing phase. Recently, this discussion has focused on the number of energy gaps in the system. Some experiments indicate a single energy gap, implying that the pseudogap is a precursor state. Others indicate two, suggesting that it is a competing or coexisting phase. Here, we use temperature-dependent scanning tunnelling spectroscopy of (Bi1−yPby)2Sr2CuO6+x to clarify the situation. We find a previously unobserved narrow and homogeneous gap that vanishes near Tc, superimposed on the typically observed inhomogeneous and broad gap, which is only weakly temperature dependent. These results not only support the two-gap picture, but also explain previously troubling differences between scanning tunnelling microscopy and other experimental measurements.
Subfields: Condensed Matter Physics, Electronic, Optical and Magnetic Materials
View Paper: https://www.semanticscholar.org/paper/5b67e869bcd039ad2e5905a8b2c7e6e2cc3f6960
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In Condensed Matter Physics
In Electronic, Optical and Magnetic Materials
Citations in the corpus
- Quantum frustration in organic Mott insulators: from spin liquids to unconventional superconductors (2010, result): “This ‘two gap’ picture is similar to what is observed in the cuprates (Boyer et al., 2007; Fischer et al., 2007).”