An unusual isotope effect in a high-transition-temperature superconductor.
Author(s) : GWEON G. H., SASAGAWA T., ZHOU S., et al.
Type of article: Article
Summary
In conventional superconductors, the electron pairing that allows superconductivity is caused by exchange of virtual phonons, which are quanta of lattice vibration. For high-transition-temperature (high-Tc) superconductors, it is far from clear that phonons are involved in the pairing at all. In this article, the authors provide a detailed comparison of the electron dynamics of Bi2212 samples containing different oxygen isotopes, using angle-resolved photoemission spectroscopy. Their data show definite and strong isotope effects. Surprisingly, the effects mainly appear in broad high-energy humps, commonly referred to as 'incoherent peaks'. As a function of temperature and electron momentum, the magnitude of the isotope effect closely correlates with the superconducting gap-that is, the pair binding energy. They suggest that these results can be explained in a dynamic spin-Peierls picture, where the singlet pairing of electrons and the electron-lattice coupling mutually enhance each other.
Details
- Original title: An unusual isotope effect in a high-transition-temperature superconductor.
- Record ID : 2005-0007
- Languages: English
- Source: Nature - vol. 430 - n. 6996
- Publication date: 2004/07/08
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Indexing
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- Date : 2004/06/03
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- Author(s) : ZAANEN J.
- Date : 2004/07/29
- Languages : English
- Source: Nature - vol. 430 - n. 6999
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