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Дата изменения: Wed Mar 20 13:56:16 2002
Дата индексирования: Tue Oct 2 02:16:06 2012
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Поисковые слова: photosphere
H. He, P. Bourges, Y. Sidis, C. Ulrich,
L. P. Regnault, S. Pailhes, N. S. Berzigiarova, N. N. Kolesnikov, B. Keimer. Magnetic resonant mode in the single-layer high-temperature
superconductor Tl2Ba2CuO6+x.
Abstract: An unusual spin excitation mode observed by neutron
scattering has inspired numerous theoretical studies of the interplay between
charged quasiparticles and collective spin excitations in the copper oxide
high temperature superconductors. The mode has thus far only been observed
in materials with crystal structures consisting of copper oxide bilayers,
and it is absent in the single-layer compound La2-xSrxCuO4+x
. Neutron scattering data now show that the mode is present in Tl2Ba2CuO6+x,
a single-layer compound with Tc 90 K, demonstrating that it
is a generic feature of the copper oxide superconductors, independent of
the layer sequence. This restricts the theoretical models for the origin
of the resonant mode and its role in the mechanism of high temperature
superconductivity.