Electric transport as a probe to unveil microscopic aspects of oxygen-depleted YBCO

C. Acha; A. Camjayi; T. Vaimala; H. Huhtinen; P. Paturi

doi:10.1016/j.jallcom.2025.178760

paper

Electric transport as a probe to unveil microscopic aspects of oxygen-depleted YBCO

arXiv:2501.16278 · doi:10.1016/j.jallcom.2025.178760

Abstract

We report on the characterization of Pt-YBa $_{2}$ Cu $_{3}$ O $_{7 - δ}$ interfaces, focusing on how oxygen vacancies content ( $δ$ ) affects electrical transport mechanisms. Our study examines four Pt-YBa $_{2}$ Cu $_{3}$ O $_{7 - δ}$ samples with varying $δ$ (0.12 $\leq δ \leq$ 0.56) using voltage-current measurements across a temperature range. We successfully model the electrical behavior using a Poole-Frenkel conduction framework, revealing that oxygen vacancies create potential wells that trap carriers, directly influencing conduction. We observe that the energy of these traps increases as $δ$ rises, in agreement with a peak previously detected in optical conductivity measurements. This result supports earlier interpretations, strengthening the proposed connection between oxygen vacancies and the ionization energy associated with impurity bands in YBa $_{2}$ Cu $_{3}$ O $_{7 - δ}$ .

24 pages, 15 figures

Electric transport as a probe to unveil microscopic aspects of oxygen-depleted YBCO

Abstract

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