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Superconductors: unusual oxygen isotope effects in cuprates?
John F Douglas1, Hideaki Iwasawa, Zhe Sun
1Department of Physics, University of Colorado, Boulder, Colorado 80309-0390, USA.
Abstract:
The possibility that a pairing boson might act as the 'glue' to bind electrons into a Cooper pair in superconductors with a high critical temperature (T(c)) is being actively pursued in condensed-matter physics. Gweon et al. claim that there is a large and unusual oxygen-isotope effect on the electronic structure, indicating that phonons have a special importance in high-temperature superconductors. However, we are unable to detect this unusual oxygen-isotope effect in new data collected under almost identical material and experimental conditions. Our findings point towards a more conventional influence of phonons in these materials.
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