Two resonant magnetic modes in an overdoped high-$\bf T_c$ superconductor

Details Two resonant magnetic modes in an overdoped high-$\bf T_c$ superconductor Two resonant magnetic modes in an overdoped high-$\bf T_c$ superconductor

2003-08-20

arxiv.org/abs/cond-mat/0308394v1

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.

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