Superconductive Phonon Anomalies in High-Tc Cuprates
Abstract
We consider the effects on phonon dynamics of spin-lattice coupling within the slave-boson mean-field treatment of the extended t-J model. With no additional assumptions the theory is found to give a semi-quantitative account of the frequency and linewidth anomalies observed by Raman and neutron scattering for the 340cm-1 B1g phonon mode in YBa2Cu3O7 at the superconducting transition. We discuss the applicability of the model to phonon modes of different symmetries, and report a connection to spin-gap features observed in underdoped YBCO. The results suggest the possibility of a unified understanding of the anomalies in transport, magnetic and lattice properties.
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