Anomalous behavior of phonon spectrum near 2.5-order phase transition
Galkin A.A., Svistunov V.M., Revenko Yu.F., Mostovoi V.M., Belogolovskii M.A.
By the method of electron tunneling we have found a nonlinear behavior of the phonon frequencies of indium fused with tin. We discussed the possible causes of these anomalies, and also their influence on the critical temperature of the superconducting transition.