Oxygen ordering in untwinned YBa2Cu3 O7-δ films driven by electrothermal stress
Artikel i vetenskaplig tidskrift, 2023

We experimentally investigate the displacement of oxygen vacancies at high current densities in highly untwinned YBa2Cu3O7-δ films grown on top of MgO substrates. Transport bridges oriented along the YBa2Cu3O7-δ crystallographic directions [100] (a axis), [010] (b axis), and [110] (45∘ from principal axes) reveal that the onset of vacancy migration is mainly determined by the local temperature (or equivalently by the dissipated power) rather than the associated activation energy. Exceeding this threshold value, a clear directional migration proceeds as evidenced by optical microscopy. Concomitant electrotransport measurements show that an intermediate phase, characterized by a decrease in resistivity, precedes long-range migration of vacancies. We numerically demonstrate that this intermediate phase consists of a homogenization of the oxygen distribution along the transport bridge, a phenomenon strongly dependent on the activation energy and the initial degree of disorder. These findings provide some important clues to determine the level of order/disorder in YBa2Cu3O7-δ films based on electric transport measurements.


Stefan Marinković

Universite de Liège

Edoardo Trabaldo

Chalmers, Mikroteknologi och nanovetenskap, Kvantkomponentfysik

Simon Collienne

Universite de Liège

Floriana Lombardi

Chalmers, Mikroteknologi och nanovetenskap, Kvantkomponentfysik

Thilo Bauch

Chalmers, Mikroteknologi och nanovetenskap, Kvantkomponentfysik

A. V. Silhanek

Universite de Liège

Physical Review B

24699950 (ISSN) 24699969 (eISSN)

Vol. 107 1 014208

Kvantfluktuationer och Kvantsammanflätning i Högtemperatursupraledare

Vetenskapsrådet (VR) (2020-05184), 2021-01-01 -- 2024-12-31.

Undersökning av en högtemperatursupraledares fasdiagram på nanometerskala

Vetenskapsrådet (VR) (2018-04658), 2019-01-01 -- 2022-12-31.


Oorganisk kemi

Annan fysik

Den kondenserade materiens fysik



Mer information

Senast uppdaterat