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Evidence for ferroelectric phase transitions and excitonic high-Tc superconductivity in YBa2Cu3O7−δ from ultrasonic measurements

Materials ScienceSuperconducting MaterialHigh-tc SuperconductivityEngineeringPhysicsFerroelectric ApplicationHigh-temperature SuperconductivityExcitonic High-tc SuperconductivityApplied PhysicsSuperconductivityCondensed Matter PhysicsHigh Tc SuperconductorsFerroelectric Phase TransitionsUltrasonic Measurements