Magnetic Resonant Mode in the Single-Layer High-Temperature Superconductor Tl2Ba2CuO6+
H. He,1
P. Bourges,2
Y. Sidis,2
C. Ulrich,1
L. P. Regnault,3
S. Pailhès,2
N. S. Berzigiarova,4
N. N. Kolesnikov,4
B. Keimer1*
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+
.
Neutron-scattering data now show that the mode is present in
Tl2Ba2CuO6+, a single-layer
compound with a superconducting transition temperature of ~90
kelvin, 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.
1 Max-Planck-Institut für
Festkörperforschung, 70569 Stuttgart, Germany.
2 Laboratoire Léon Brillouin, CEA-CNRS, CE
Saclay, 91191 Gif sur Yvette, France.
3 CEA
Grenoble, Département de Recherche Fondamentale sur la
Matière Condensée, 38054 Grenoble cedex 9, France.
4 Institute of Solid State Physics, Russian Academy
of Science, Chernogolovka, 142432 Russia.
*
To whom correspondence should be addressed. E-mail:
b.keimer{at}fkf.mpg.de
