Origin of the enhanced ferroelectricity in multiferroic SmMn(2)O(5)

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F19%3A10401069" target="_blank" >RIV/00216208:11320/19:10401069 - isvavai.cz</a>

Výsledek na webu

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=C5gdP1PTK9" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=C5gdP1PTK9</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1103/PhysRevB.100.085147" target="_blank" >10.1103/PhysRevB.100.085147</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Origin of the enhanced ferroelectricity in multiferroic SmMn(2)O(5)

Popis výsledku v původním jazyce

In orthorhombic SmMn2O5 single crystals, Sm3+ crystal-field (CF) excitations are studied by infrared transmission as a function of temperature and under applied magnetic field up to 10 T. These measurements are complemented with the study of Raman-active phonon frequency shifts as a function of temperature between 300 and 5 K. The frequencies of all H-6(j) crystal-field levels of Sm3+ were determined as well as those of H-6(j). At high temperatures, the evolutions of Sm3+ CF excitations exhibit anomalies around the characteristic temperatures, T* similar to 60 K and T-s similar to 120 K and reflect the thermal disorder induced by splitting of the Sm-O bonds in SmMn2O5 that contribute to the frequency and linewidth phonon shifting. At low temperatures, the degeneracy of the ground-state Kramers doublet is lifted (Delta(0) similar to 36 cm(-1)) due to the Sm3(+)-Mn3+ interaction in the ferroelectric phase and strongly enhanced below T c similar to 26 K. The Sm-Mn exchange interaction J(6) is determined and compared to that of Gd-Mn interaction in GdMn2O5. The Sm magnetic moment m(sm )(T) and the Sm contribution to the magnetic susceptibility are also evaluated from Delta(0)(T), indicating that the Sm-Mn interaction is strongly implicated in the magnetic and the ferroelectric orderings below similar to 26 K. The study of the Sm3+ CF excitations as a function of magnetic field reveals twinning in SmMn2O5. This twinning could affect its electric polarization behavior versus magnetic field.

Název v anglickém jazyce

Origin of the enhanced ferroelectricity in multiferroic SmMn(2)O(5)

Popis výsledku anglicky

In orthorhombic SmMn2O5 single crystals, Sm3+ crystal-field (CF) excitations are studied by infrared transmission as a function of temperature and under applied magnetic field up to 10 T. These measurements are complemented with the study of Raman-active phonon frequency shifts as a function of temperature between 300 and 5 K. The frequencies of all H-6(j) crystal-field levels of Sm3+ were determined as well as those of H-6(j). At high temperatures, the evolutions of Sm3+ CF excitations exhibit anomalies around the characteristic temperatures, T* similar to 60 K and T-s similar to 120 K and reflect the thermal disorder induced by splitting of the Sm-O bonds in SmMn2O5 that contribute to the frequency and linewidth phonon shifting. At low temperatures, the degeneracy of the ground-state Kramers doublet is lifted (Delta(0) similar to 36 cm(-1)) due to the Sm3(+)-Mn3+ interaction in the ferroelectric phase and strongly enhanced below T c similar to 26 K. The Sm-Mn exchange interaction J(6) is determined and compared to that of Gd-Mn interaction in GdMn2O5. The Sm magnetic moment m(sm )(T) and the Sm contribution to the magnetic susceptibility are also evaluated from Delta(0)(T), indicating that the Sm-Mn interaction is strongly implicated in the magnetic and the ferroelectric orderings below similar to 26 K. The study of the Sm3+ CF excitations as a function of magnetic field reveals twinning in SmMn2O5. This twinning could affect its electric polarization behavior versus magnetic field.

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

2019

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

—

Svazek periodika

100

Číslo periodika v rámci svazku

8

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

9

Strana od-do

085147

Kód UT WoS článku

000483347600002

EID výsledku v databázi Scopus

2-s2.0-85072577091