The structure of the high-energy spin excitations in a high-transition-temperature superconductor View Full Text


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Article Info

DATE

2004-06

AUTHORS

S. M. Hayden, H. A. Mook, Pengcheng Dai, T. G. Perring, F. Doğan

ABSTRACT

In conventional superconductors, lattice vibrations (phonons) mediate the attraction between electrons that is responsible for superconductivity1. The high transition temperatures (high-Tc) of the copper oxide superconductors has led to collective spin excitations being proposed as the mediating excitations in these materials2. The mediating excitations must be strongly coupled to the conduction electrons, have energy greater than the pairing energy, and be present at Tc. The most obvious feature in the magnetic excitations of high-Tc superconductors such as YBa2Cu3O6+x is the so-called ‘resonance’3,4,5,6. Although the resonance may be strongly coupled to the superconductivity3,4,5,6,7,8, it is unlikely to be the main cause, because it has not been found in the La2-x(Ba,Sr)xCuO4 family and is not universally present in Bi2Sr2CaCu2O8+δ (ref. 9). Here we use inelastic neutron scattering to characterize possible mediating excitations at higher energies in YBa2Cu3O6.6. We observe a square-shaped continuum of excitations peaked at incommensurate positions. These excitations have energies greater than the superconducting pairing energy, are present at Tc, and have spectral weight far exceeding that of the ‘resonance’. The discovery of similar excitations in La2–xBaxCuO4 (ref. 10) suggests that they are a general property of the copper oxides, and a candidate for mediating the electron pairing. More... »

PAGES

531-534

Identifiers

URI

http://scigraph.springernature.com/pub.10.1038/nature02576

DOI

http://dx.doi.org/10.1038/nature02576

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1044227103

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/15175744


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