Role of spin-phonon and electron-phonon interactions in the phonon renormalization of (Eu1-xBix)2Ir2 O7 across the metal-insulator phase transition: Temperature-dependent Raman and x-ray studies

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21340%2F22%3A00358314" target="_blank" >RIV/68407700:21340/22:00358314 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1103/PhysRevB.105.075145" target="_blank" >https://doi.org/10.1103/PhysRevB.105.075145</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1103/PhysRevB.105.075145" target="_blank" >10.1103/PhysRevB.105.075145</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Role of spin-phonon and electron-phonon interactions in the phonon renormalization of (Eu1-xBix)2Ir2 O7 across the metal-insulator phase transition: Temperature-dependent Raman and x-ray studies

Popis výsledku v původním jazyce

We report temperature-dependent Raman scattering and x-ray diffraction studies of pyrochlore iridates (Eu1-xBix)2Ir2O7, for x=0, 0.02, 0.035, 0.05, and 0.1. The temperature variation in Raman experiments spans from 4 to 300 K, covering the metal-insulator phase transition accompanied by paramagnetic-to-all-in/all-out (AIAO) spin ordering (TN). These systems also show a Weyl semimetal (WSM) phase at low temperatures (<~50K). The Ir-O-Ir bond bending mode A1g (510 cm-1) shows anomalous softening (for x=0.0, 0.02, 0.035, and 0.05) in the magnetically ordered AIAO state, arising primarily from the spin-phonon interaction due to the phonon modulation of the Dzyaloshinskii-Moriya spin-exchange interaction. The two stretching modes T2g1 (307 cm-1) and T2g2 (382 cm-1) harden significantly in the magnetic insulating phase. The T2g phonons (for x=0.0, 0.02, 0.035, and 0.05) also show anomalous temperature dependence of their mode frequencies above TN due to strong electron-phonon coupling. The signatures of the WSM state are observed clearly in phonon renormalization <50K (in x=0.02) due to strong electron-phonon interaction. Our experimental results establish strong magneto-elastic coupling below TN and significant electron-phonon interactions in the metallic phase above TN as well as in the low-temperature WSM state. 2022 American Physical Society.

Název v anglickém jazyce

Role of spin-phonon and electron-phonon interactions in the phonon renormalization of (Eu1-xBix)2Ir2 O7 across the metal-insulator phase transition: Temperature-dependent Raman and x-ray studies

Popis výsledku anglicky

We report temperature-dependent Raman scattering and x-ray diffraction studies of pyrochlore iridates (Eu1-xBix)2Ir2O7, for x=0, 0.02, 0.035, 0.05, and 0.1. The temperature variation in Raman experiments spans from 4 to 300 K, covering the metal-insulator phase transition accompanied by paramagnetic-to-all-in/all-out (AIAO) spin ordering (TN). These systems also show a Weyl semimetal (WSM) phase at low temperatures (<~50K). The Ir-O-Ir bond bending mode A1g (510 cm-1) shows anomalous softening (for x=0.0, 0.02, 0.035, and 0.05) in the magnetically ordered AIAO state, arising primarily from the spin-phonon interaction due to the phonon modulation of the Dzyaloshinskii-Moriya spin-exchange interaction. The two stretching modes T2g1 (307 cm-1) and T2g2 (382 cm-1) harden significantly in the magnetic insulating phase. The T2g phonons (for x=0.0, 0.02, 0.035, and 0.05) also show anomalous temperature dependence of their mode frequencies above TN due to strong electron-phonon coupling. The signatures of the WSM state are observed clearly in phonon renormalization <50K (in x=0.02) due to strong electron-phonon interaction. Our experimental results establish strong magneto-elastic coupling below TN and significant electron-phonon interactions in the metallic phase above TN as well as in the low-temperature WSM state. 2022 American Physical Society.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10302 - Condensed matter physics (including formerly solid state physics, supercond.)

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2022

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

PHYSICAL REVIEW B

ISSN

2469-9950

e-ISSN

2469-9969

Svazek periodika

105

Číslo periodika v rámci svazku

7

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

14

Strana od-do

—

Kód UT WoS článku

000766655300003

EID výsledku v databázi Scopus

2-s2.0-85126065990