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

Inelastic neutron scattering studies have been carried out on selectedphonons and magnetic excitations of a crystal of superconducting (SC)Ca$_{10}$Pt$_4$As$_8$(Fe$_{1-x}$Pt$_x$As)$_{10}$ with the onset transitiontemperature $T_{\rm c}^{\rm onset} \sim$ 33 K to investigate the role thatorbital fluctuations play in the Cooper pairing. The spectral weight of themagnetic excitations, $\chi ''({\bm Q}, \omega)$ at ${\bm Q} = {\bm Q}_{\rm M}$(magnetic $\Gamma$ points) is suppressed (enhanced) in the relatively low(high) $\omega$ region. The maximum of the enhancement is located at $\omega =\omega_{\rm p} \sim$ 18 meV at temperature $T = 3$ K corresponding to the$\omega_{\rm p}/k_{\rm B}T_{\rm c}^{\rm onset} \sim$ 6.3. This large value israther favorable to the orbital-fluctuation mechanism of the superconductivitywith the so-called $S_{++}$ symmetry. In the phonon measurements, we observedslight softening of the in-plane transverse acoustic mode corresponding to theelastic constant $C_{66}$. This softening starts at $T$ well above thesuperconducting $T_{\rm c}$, as $T$ decreases. An anomalously large increase inthe phonon spectral weight of in-plane optical modes was observed in the rangeof $35 < \omega < 40$ meV with decreasing $T$ from far above $T_{\rm c}$.Because this $\omega$ region mainly corresponds to the in-plane vibrations ofFe atoms, the finding presents information on the coupling between the orbitalfluctuation of the Fe 3$d$ electrons and lattice system, useful for studyingpossible roles of the orbital fluctuation in the pairing mechanism andappearance of the so-called nematic phase.

Phonon and Magnetic Excitations in Superconducting Ca$_{10}$Pt$_4$As$_8$(Fe$_{1-x}$Pt$_x$As)$_{10}$