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 Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

The evolution of the temperature dependence of pseudogap $\Delta$*(T) inoptimally doped (OD) YBa$_2$Cu$_3$O$_{7-\delta}$ (YBCO) films with $T_{c}$ =88.7 K under the influence of a magnetic field $B$ up to 8 T has been studiedin detail. It has been established that the shape of $\Delta$*(T) for various$B$ over the entire range from the pseudogap opening temperature $T$* to$T_{01}$, below which superconducting fluctuations occur, has a wide maximum atthe BEC-BCS crossover temperature $T_{pair}$, which is typical for OD films anduntwinned YBCO single crystals. $T$* was shown to be independent on $B$,whereas $T_{pair}$ shifts to the low temperature region along with increase of$B$, while the maximum value of $\Delta$*($T_{pair}$) remains practicallyconstant regardless of $B$. It was revealed that as the field increases, thelow-temperature maximum near the 3D-2D transition temperature $T_{0}$ isblurred and disappears at $B$ > 5 T. Moreover, above the Ginzburg temperature$T_{G}$, which limits superconducting fluctuations from below, at $B$ > 0.5 T,a minimum appears on $\Delta$*(T) at $T_{min}$, which becomes very pronouncedwith a further increase in the field. As a result, the overall value of$\Delta$*(T) decreases noticeably most likely due to pair-breaking affect of amagnetic field. A comparison of $\Delta$*(T) near $T_{c}$ with the Peters-Bauertheory shows that the density of fluctuating Cooper pairs actually decreasesfrom <<n$_{\uparrow}$n$_{\downarrow}$>> $\approx$ 0.31 at $B$ = 0 to<<n$_{\uparrow}$n$_{\downarrow}$>> $\approx$ 0.28 in the field 8 T. Theobserved behavior of $\Delta$*(T) around $T_{min}$ is assumed to be due to theinfluence of a two-dimensional vortex lattice created by the magnetic field,which prevents the formation of fluctuating Cooper pairs near $T_{c}$.

Evolution of the pseudogap temperature dependence in YBa$_2$Cu$_3$O$_{7-\delta}$ films under the influence of a magnetic field