Physics – Condensed Matter – Superconductivity
Scientific paper
2003-08-20
Phys. Rev. Lett. 91, 237002 (2003).
Physics
Condensed Matter
Superconductivity
Submitted to PRL
Scientific paper
10.1103/PhysRevLett.91.237002
A detailed inelastic neutron scattering study of the overdoped high temperature copper oxide superconductor ${Y_{0.9}Ca_{0.1}Ba_{2}Cu_3O_{7}}$ reveals two distinct magnetic resonant modes in the superconducting state. The modes differ in their symmetry with respect to exchange between adjacent copper oxide layers. Counterparts of the mode with odd symmetry, but not the one with even symmetry, had been observed before at lower doping levels. The observation of the even mode resolves a long-standing puzzle, and the spectral weight ratio of both modes yields an estimate of the onset of particle-hole spin-flip excitations.
Bernhard Christian
Bourges Ph.
Hinkov Vladimir
Ivanov Anatoly A.
Keimer Bernhard
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