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 Tools annual

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 monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

Understanding the magnetic excitations in high-transition temperature(high-$T_c$) copper oxides is important because they may mediate the electronpairing for superconductivity. By determining the wavevector ({\bf Q}) andenergy ($\hbar\omega$) dependence of the magnetic excitations, one cancalculate the change in the exchange energy available to the superconductingcondensation energy. For the high-$T_c$ superconductor YBa$_2$Cu$_3$O$_{6+x}$,the most prominent feature in the magnetic excitations is the resonance.Although the resonance has been suggested to contribute a major part of thesuperconducting condensation, the accuracy of such an estimation has been indoubt because the resonance is only a small portion of the total magneticscattering. Here we report an extensive mapping of magnetic excitations forYBa$_2$Cu$_3$O$_{6.95}$ ($T_c\approx 93$ K). Using the absolute intensitymeasurements of the full spectra, we estimate the change in the magneticexchange energy between the normal and superconducting states and find it to beabout 15 times larger than the superconducting condensation energy. Our resultsthus indicate that the change in the magnetic exchange energy is large enoughto provide the driving force for high-$T_c$ superconductivity inYBa$_2$Cu$_3$O$_{6.95}$.

Magnetic energy change available to superconducting condensation in optimally doped YBa2Cu3O6.95