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- W1625754 abstract "We discuss the interplay of particle-particle and particle-hole spin-triplet channels in high-${T}_{c}$ superconductors using a quasiparticle dispersion motivated by angle-resolved photoemission. Within a generalized random-phase approximation, we find a well-defined antibound state of two holes, the $ensuremath{pi}$ resonance of Demler and Zhang, as well as a bound state of a particle and a hole, the spin exciton. We show that the energy of the $ensuremath{pi}$ resonance always exceeds $2ensuremath{Delta},$ twice the maximum d-wave gap, therefore the neutron resonance observed in the cuprates around energy $ensuremath{Delta}$ is most likely a spin exciton. At the same time, we speculate that the $ensuremath{pi}$ particle can exist at higher energies and might be observed in neutron scattering around 100 meV." @default.
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- W1625754 date "2001-03-19" @default.
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- W1625754 title "Neutron resonance in high-<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi>T</mml:mi></mml:mrow><mml:mrow><mml:mi>c</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>superconductors is not the π particle" @default.
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- W1625754 doi "https://doi.org/10.1103/physrevb.63.144507" @default.
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