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 report temperature-dependent Raman scattering and X-ray diffractionstudies of pyrochlore iridates, (Eu$_{1-x}$Bi$_x$)$_2$Ir$_2$O$_7$, for x=0,0.02, 0.035, 0.05 and 0.1. The temperature variation in Raman experiments spansfrom 4 K to 300 K, covering the metal-insulator phase transition accompanied byparamagnetic to all-in/all-out (AIAO) spin ordering (T$_N$). These systems alsoshow a Weyl semi-metal (WSM) phase at low temperatures (below ~50 K). We showthat the Ir-O-Ir bond bending mode, A$_{1g}$ (510 cm$^{-1}$), shows anomaloussoftening in the magnetically ordered AIAO state, arising primarily from thespin-phonon interaction due to the phonon-modulation of theDzyaloshinskii-Moriya (DM) spin-exchange interaction. The two stretching modes,T$_{2g}^1$ (307 cm$^{-1}$) and T$_{2g}^2$ (382 cm$^{-1}$) harden significantlyin the magnetic insulating phase. The T$_{2g}$ phonons also show anomaloustemperature dependence of their mode frequencies, hitherto unreported, due tostrong electron-phonon coupling. The signatures of the WSM state are observedin phonon renormalization below 50 K due to strong electron-phonon interaction.Our experimental results establish strong magneto-elastic coupling below T$_N$and significant electron-phonon interactions in the metallic phase above T$_N$as well as in the low-temperature WSM state.

physical review. b./physical review. b

Role of spin-phonon and electron-phonon interactions in phonon  renormalization of (Eu$_{1-x}$Bi$_x$)$_2$Ir$_2$O$_7$ across the  metal-insulator phase transition: Temperature-dependent Raman and X-ray  studies