Yu, G., Li, Y., Motoyama, E. M., Hradil, K., Mole, R. A., & Greven, M. (2010). Two characteristic energies in the low-energy magnetic response of the electron-doped high-temperature superconductor Nd2-xCexCuO4+delta. Physical Review B, 82(172505). https://doi.org/10.1103/physrevb.82.172505
Condensed Matter Physics; Electronic, Optical and Magnetic Materials; 61.05.fg; 74.25.Ha; 75.40.Gb; PACS number(s): 74.72.-h
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Abstract:
Neutron scattering for Nd2−xCexCuO4+delta (x~0.155, Tc=25 K) reveals two distinct magnetic energy scales in
the superconducting state: omega1~6.4 meV and omega2~4.5 meV. These magnetic energies agree quantitatively
with the B1g /B2g and A1g features observed in electronic Raman scattering, where the former is believed to
indicate the maximum superconducting gap and the origin of the latter has remained unexplained. The data are
inconsistent with previous claims of the existence of a magnetic resonance mode near 10 meV, but consistent
with a resonance at omega2 and with the recently established universal ratio of resonance energy to superconducting
gap in unconventional superconductors.
