DOI: 10.1063/10.0031727 ISSN: 0360-0335
Anomalous behavior of the elastic modulus in La1.8Sr0.2CuO4
A. L. Gaiduk, S. V. Zherlitsyn, A. S. Panfilov, V. M. Puzikov, A. M. Stepanenko, V. D. Fil’, A. S. ChernyiWe have observed a significant (up to 10%) reduction in the longitudinal and transverse sound velocities in the ceramic La1.8Sr0.2CuO4. The reduction is detectable in the temperature range 200−40 K and indicates that the system is approaching a structurally unstable state.