Strong-coupling Effects in cuprate High-Tc Superconductors by magnetooptical studies
Y. S. Lee, Z. Q. Li, W. J. Padilla, S. V. Dordevic, C. C. Homes, Kouji Segawa, Yoichi Ando, D. N. Basov
Abstract
Signatures of strong coupling effects in cuprate high-Tc superconductors have been authenticated through a variety of spectroscopic probes. However, the microscopic nature of relevant excitations has not been agreed upon. Here we report on magneto-optical studies of the CuO2 plane carrier dynamics in a prototypical high-Tc superconductor YBa%2 Cu3Oy (YBCO). Infrared data are directly compared with earlier inelastic neutron scattering results by Dai et al. [Nature (London) 406, 965 (2000)] revealing a characteristic depression of the magnetic resonance in H c field less than 7 T. This analysis has allowed us to critically assess the role of magnetic degrees of freedom in producing strong coupling effects for YBCO system.
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