A1 Vertaisarvioitu alkuperäisartikkeli tieteellisessä lehdessä
Electric transport as a probe to unveil microscopic aspects of oxygen-depleted YBCO
Tekijät: Acha, C.; Camjayi, A.; Vaimala, T.; Huhtinen, H.; Paturi, P.
Kustantaja: Elsevier BV
Kustannuspaikka: LAUSANNE
Julkaisuvuosi: 2025
Journal: Journal of Alloys and Compounds
Tietokannassa oleva lehden nimi: Journal of Alloys and Compounds
Lehden akronyymi: J ALLOY COMPD
Artikkelin numero: 178760
Vuosikerta: 1015
Sivujen määrä: 8
ISSN: 0925-8388
eISSN: 1873-4669
DOI: https://doi.org/10.1016/j.jallcom.2025.178760
Verkko-osoite: https://doi.org/10.1016/j.jallcom.2025.178760
We report on the characterization of Pt-YBa2Cu3O7-delta interfaces, focusing on how oxygen vacancies content (delta) affects electrical transport mechanisms. Our study examines four Pt-YBa2Cu3O7-delta samples with varying delta (0.12 <=delta <= 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 delta 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 oxygen-depleted YBa2Cu3O7 - (delta).
Julkaisussa olevat rahoitustiedot:
We acknowledge very useful discussions with Dr. V. Ferrari and Dr. J. Dilson, as well as financial support by CONICET Grant PIP 11220200101300CO and UBACyT 20020220200062BA (2023–2025). Jenny and Antti Wihuri Foundation is also acknowledged for financial support.
