English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We consider slow, steady transport for the normal state of the superconductorLa$_2$CuO$_{4+\delta}$ in a one-dimensional geometry, with surface fluxessufficiently general to permit oxygen to be driven into the sample (``loaded'')either by electrochemical means or by high oxygen partial pressure. We includethe bulk reaction O$\to$O$^{2-}+2h$, where neutral atoms ($a$) go into ions($i$) and holes ($h$). For slow, steady transport, the transport equationssimplify because the bulk reaction rate density $r$ and the bulk loading rates$\partial_t n$ then are uniform in space and time. All three fluxes $j$ must bespecified at each surface, which for a uniform current density $J$ correspondsto five independent fluxes. These fluxes generate two types of static modes ateach surface and a bulk response with a voltage profile that variesquadratically in space, characterized by $J$ and the total oxygen flux $j_O$(neutral plus ion) at each surface. One type of surface mode is associated withelectrical screening; the other type is associated both with diffusion anddrift, and with chemical reaction (the {\it diffusion-reaction mode}). Thediffusion-reaction mode is accompanied by changes in the chemical potentials$\mu$, and by reactions and fluxes, but it neither carries current (J=0) norloads the system chemically ($j_O=0$). Generation of the diffusion-reactionmode may explain the phenomenon of ``turbulence in the voltage'' often observednear the electrodes of other mixed ionic electronic conductors (MIECs).Comment: 11 pages, 1 figur

physical review. b, condensed matter and materials physics

Slow steady transport with loading and bulk reactions: The mixed ionic conductor<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">La</mml:mi></mml:mrow><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mrow><mml:mi mathvariant="normal">CuO</mml:mi></mml:mrow><mml:mrow><mml:mn>4</mml:mn><mml:mo>+</mml:mo><mml:mi>δ</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>

Slow steady transport with loading and bulk reactions: The mixed ionic conductorLa2CuO4+δ