Volume 66, Number 6, June 2004
|Page(s)||840 - 846|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||01 June 2004|
Unusual interplay between copper-spin and vortex dynamics in slightly overdoped
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
Accepted: 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.
PACS: 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
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