Modifying the magnetoelectric coupling in TbMnO3 by low-level Fe3+ substitution

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A_____%2F23%3A00570777" target="_blank" >RIV/68378271:_____/23:00570777 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1103/PhysRevB.107.104410" target="_blank" >https://doi.org/10.1103/PhysRevB.107.104410</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1103/PhysRevB.107.104410" target="_blank" >10.1103/PhysRevB.107.104410</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Modifying the magnetoelectric coupling in TbMnO3 by low-level Fe3+ substitution

Popis výsledku v původním jazyce

We report a comprehensive study of the low-level substitution of Mn3+ by Fe3+ effect on the static and dynamic magnetoelectric coupling in TbMn1−xFexO3 (x=0, 0.02, and 0.04). Low-lying electromagnon excitation is activated in the cycloidal modulated antiferromagnetic and ferroelectric phase in TbMnO3, while it is observed up to TN in the Fe-substituted compounds, pointing at different mechanisms for static and dynamic magnetoelectric coupling. A second electrically active excitation near 40 cm−1 is explained by means of Tb3+ crystal-field effects. This excitation is observed up to room temperature, and exhibits a remarkable 15 cm−1 downshift on cooling in Fe-substituted compounds. Both electromagnon and crystal-field excitations are found to be coupled to the polar phonons with frequencies up to 250 cm−1. The anomalies in the T dependence of magnetic susceptibility above TN are well accounted for by spin-phonon coupling and crystal-field excitation, coupled to oxygen motions.

Název v anglickém jazyce

Modifying the magnetoelectric coupling in TbMnO3 by low-level Fe3+ substitution

Popis výsledku anglicky

We report a comprehensive study of the low-level substitution of Mn3+ by Fe3+ effect on the static and dynamic magnetoelectric coupling in TbMn1−xFexO3 (x=0, 0.02, and 0.04). Low-lying electromagnon excitation is activated in the cycloidal modulated antiferromagnetic and ferroelectric phase in TbMnO3, while it is observed up to TN in the Fe-substituted compounds, pointing at different mechanisms for static and dynamic magnetoelectric coupling. A second electrically active excitation near 40 cm−1 is explained by means of Tb3+ crystal-field effects. This excitation is observed up to room temperature, and exhibits a remarkable 15 cm−1 downshift on cooling in Fe-substituted compounds. Both electromagnon and crystal-field excitations are found to be coupled to the polar phonons with frequencies up to 250 cm−1. The anomalies in the T dependence of magnetic susceptibility above TN are well accounted for by spin-phonon coupling and crystal-field excitation, coupled to oxygen motions.

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

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2023

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

107

Číslo periodika v rámci svazku

10

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

13

Strana od-do

104410

Kód UT WoS článku

000974419900001

EID výsledku v databázi Scopus

2-s2.0-85150864856