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/

Zendy Open

Presents the pdf analysis as premium feature

PDF Analysis

Insights

Presents the summarisation as premium feature

Summarisation

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the zaia usage as premium feature

ZAIA

Zendy Tools

Zendy Plus

Presents the access of premium content as premium feature

Premium Content

Muon spin relaxation ($\mu$SR) studies of the "1111" and "122" FeAs systemshave detected static magnetism with variably sized ordered moments in theirparent compounds. The phase diagrams of FeAs, CuO, organic BEDT,A$_{3}$C$_{60}$ and heavy-fermion systems indicate competition between staticmagnetism and superconductivity, associated with first-order phase transitionsat quantum phase boundaries. In both FeAs and CuO systems, the superfluiddensity $n_{s}/m^{*}$ at $T \to 0$ exhibits a nearly linear scaling with$T_{c}$. Analogous to the roton-minimum energy scaling with the lambdatransition temperature in superfluid $^{4}$He, clear scaling with $T_{c}$ wasalso found for the energy of the magnetic resonance mode in cuprates,(Ba,K)Fe$_{2}$As$_{2}$, CeCoIn$_{5}$ and CeCu$_{2}$Si$_{2}$, as well as theenergy of the superconducting coherence peak observed by angle resolved photoemission (ARPES) in the cuprates near ($\pi$,0). Both the superfluid densityand the energy of these pair-non-breaking soft-mode excitations determine thesuperconducting $T_{c}$ via phase fluctuations of condensed bosons. Combiningthese observations and common dispersion relations of spin and chargecollective excitations in the cuprates, we propose a resonant spin chargemotion/coupling, "traffic-light resonance," expected when the charge energyscale $\epsilon_{F}$ becomes comparable to the spin fluctuation energy scale$\hbar\omega_{SF}\sim J$, as the process which leads to pair formation in thesecorrelated electron superconductors.

Energy-scale phenomenology and pairing via resonant spin-charge motion in FeAs, CuO, heavy-fermion and other exotic superconductors