An effect of spin excitations on the infrared-active phonons in YbA2Cu4O8 and YbA2Cu3O7-5 superconductors

A P. Litvinchuk

doi:10.1117/12.2298133

14 December 1992 An effect of spin excitations on the infrared-active phonons in YbA2Cu4O8 and YbA2Cu3O7-5 superconductors

A P. Litvinchuk

Author Affiliations +

Proceedings Volume 1929, 17th International Conference on Infrared and Millimeter Waves; 19290G (1992) https://doi.org/10.1117/12.2298133
Event: 17th International Conference on Infrared and Millimeter Waves, 1992, Pasadena, CA, United States

Abstract

Infrared- as well as Raman-active phonons of YBa2Cu307 are strongly affected by the transition to the superconducting state. The origin of the effect is the phonon interaction with electronic excitations, which are modified upon going into the superconducting state. A detailed analysis of the phonon self- energy effects at the superconducting transition temperature (Tc) and a comparison of the experimental data with theoretical results yielded, for example, a rather accurate value of the superconducting gap [1-3]. Our investigation showed that phonons couple also to spin excitations in high-temperature superconductors. This interaction determines the anomalous phonon behavior found for some phonons above Tc.

Citation Download Citation

A P. Litvinchuk "An effect of spin excitations on the infrared-active phonons in YbA2Cu4O8 and YbA2Cu3O7-5 superconductors", Proc. SPIE 1929, 17th International Conference on Infrared and Millimeter Waves, 19290G (14 December 1992); https://doi.org/10.1117/12.2298133

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