Observation of spontaneous polarization at a junction of a high-Tc superconductor with an insulator upon the phase transition to the superconducting state
Lipson A. G., Sakov D. M., Gromov V. V.
Quasiferroelectric phase transitions have been observed near Tc in dense ceramic samples of YBa2Cu307 _ x and Bij 7 Pb0 3 ÿÇ2ó&2óÝ®È by the method of thermally stimulated depolarization.