Spin-roton excitations in the cuprate superconductors
J. W. Mei, Z. Y. Weng
DOI 10.1103/PhysRevB.81.014507 · Physical Review B
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Abstract
We identify a kind of elementary excitations, spin rotons, in the doped Mott insulator. They play a central role in deciding the superconducting transition temperature Tc, resulting in a simple Tc formula, kBTc≃Eg/6, with Eg as the characteristic energy scale of the spin rotons. We show that the degenerate S=1 and S=0 rotons can be probed by neutron scattering and Raman scattering measurements, respectively, in good agreement with the magnetic resonancelike mode and the Raman A1g mode observed in the high-Tc cuprates.
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