Chain Oxygen Dynamics in YBa2Cu3O7-delta Under Applied Electric Fields and Related Phenomena (original) (raw)

Mod Phys Lett B, 1994

Abstract

Three-terminal field effect devices are widespread in modern electronics due to their versatility. The possibility of tuning superconductivity, using electric fields to modulate carrier transport is of great interest. With the high temperature cuprate superconductors, which have fairly low carrier concentrations in comparison to metals, this would permit the study of properties in a systematic manner instead of relying on the stochastic nature of oxygen doping. Demonstrations of the phenomenon in YBa2Cu3O7-δ have been analysed in terms of the conventional metal field effect. In this work, we show that contrary to earlier belief, the field effect in YBa2Cu3O7-δ arises due to changes in the structure. The mechanism is one of ordering induced doping, and is not novel to this oxide, with Fe3O4 exhibiting a similar phenomenon, termed the Verwey transition. Our explanations and results are found to be consistent with experiments, both in terms of the magnitudes of the effects observed as well as their time scales. Also, explicit predictions of this model have recently been confirmed experimentally. Since the effect is omnipresent during the measurement of any physical property in this material, we present a qualitative discussion of its connotations for transport, tunneling, and magnetization. The phenomenon is of importance in a wide variety of device applications.

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