Unusual interplay between copper-spin and vortex dynamics in slightly overdopedR. Gilardi1, A. Hiess2, N. Momono3, M. Oda3, M. Ido3 and J. Mesot1
1 Laboratory for Neutron Scattering, ETH Zurich and PSI Villigen CH-5232 Villigen, Switzerland
2 Institute Laue-Langevin - BP 156, F-38042 Grenoble Cedex, France
3 Department of Physics, Hokkaido University - Sapporo 060-0810, Japan
(Received 10 October 2003; accepted in final form 19 April 2004)
Our inelastic neutron scattering experiments of the spin excitations in the slightly overdoped compound show that, under the application of a magnetic field of 5 tesla, the low-temperature susceptibility undergoes a weight redistribution centered at the spin gap energy. Furthermore, by comparing the temperature dependence of the neutron data with ac susceptibility and magnetization measurements, we conclude that the filling-in of the spin gap tracks the irreversibility/melting temperature rather than , which indicates an unusual interplay between the magnetic vortices and the spin excitations even in the slightly overdoped regime of high-temperature superconductors.
74.72.Dn - -based cuprates.
25.40.Fq - Inelastic neutron scattering.
75.40.Gb - Dynamic properties (dynamic susceptibility, spin waves, spin diffusion, dynamic scaling, etc.).
© EDP Sciences 2004