Magnetic field induced structural changes in magnetite observed by resonant x-ray diffraction and Mossbauer spectroscopy

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F62690094%3A18470%2F20%3A50017091" target="_blank" >RIV/62690094:18470/20:50017091 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/68378271:_____/20:00535672 RIV/00216208:11320/20:10422488

Výsledek na webu

<a href="https://hal.archives-ouvertes.fr/hal-02922539/file/2020_PRB_Fe3O4_Kolodziej.pdf" target="_blank" >https://hal.archives-ouvertes.fr/hal-02922539/file/2020_PRB_Fe3O4_Kolodziej.pdf</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1103/PhysRevB.102.075126" target="_blank" >10.1103/PhysRevB.102.075126</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Magnetic field induced structural changes in magnetite observed by resonant x-ray diffraction and Mossbauer spectroscopy

Popis výsledku v původním jazyce

When a magnetic field is applied to a single crystal of magnetite at 124 K &gt; T &gt; 50 K, the monoclinic c m axis, which is the easy magnetization axis, switches to one of the &lt; 100 &gt; cubic directions, nearest to the direction of the magnetic field, and the phenomenon known as an axis switching (AS) occurs. A global symmetry probe, resonant x-ray scattering, and a local probe, Mossbauer spectroscopy, are used to better understand the mechanism of axis switching. The behavior of three subsystems ordered below the Verwey transition temperature T-v, i.e., lattice distortion, an orbital, and charge orderings, was observed via resonant x-ray scattering as a function of an external magnetic field. This was preceded by calculation of selected peak intensities using the FDMNES code. The Mossbauer spectroscopy studies confirmed that the magnetic field triggers electronic rearrangements and atomic displacements. The structure observed after the process of axis switching is very similar to the one obtained after cooling below T-v with the magnetic field applied along one of the initial &lt; 100 &gt; cubic directions and distinct from the cooling in the absence of a magnetic field. From all the experimental observations of the phenomenon done so far, it is clear that AS starts from the fluctuations between octahedral iron orbitals that ultimately lead to the Verwey transition, but also to the higher-temperature trimeron dynamics. Therefore, further observation of the axis switching may be a key point to the understanding of a majority of strongly correlated electronic behavior in magnetite as well as in other transition metal oxides.

Název v anglickém jazyce

Magnetic field induced structural changes in magnetite observed by resonant x-ray diffraction and Mossbauer spectroscopy

Popis výsledku anglicky

When a magnetic field is applied to a single crystal of magnetite at 124 K &gt; T &gt; 50 K, the monoclinic c m axis, which is the easy magnetization axis, switches to one of the &lt; 100 &gt; cubic directions, nearest to the direction of the magnetic field, and the phenomenon known as an axis switching (AS) occurs. A global symmetry probe, resonant x-ray scattering, and a local probe, Mossbauer spectroscopy, are used to better understand the mechanism of axis switching. The behavior of three subsystems ordered below the Verwey transition temperature T-v, i.e., lattice distortion, an orbital, and charge orderings, was observed via resonant x-ray scattering as a function of an external magnetic field. This was preceded by calculation of selected peak intensities using the FDMNES code. The Mossbauer spectroscopy studies confirmed that the magnetic field triggers electronic rearrangements and atomic displacements. The structure observed after the process of axis switching is very similar to the one obtained after cooling below T-v with the magnetic field applied along one of the initial &lt; 100 &gt; cubic directions and distinct from the cooling in the absence of a magnetic field. From all the experimental observations of the phenomenon done so far, it is clear that AS starts from the fluctuations between octahedral iron orbitals that ultimately lead to the Verwey transition, but also to the higher-temperature trimeron dynamics. Therefore, further observation of the axis switching may be a key point to the understanding of a majority of strongly correlated electronic behavior in magnetite as well as in other transition metal oxides.

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

2020

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

102

Číslo periodika v rámci svazku

7

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

15

Strana od-do

"Article Number: 075126"

Kód UT WoS článku

000560604700002

EID výsledku v databázi Scopus

2-s2.0-85090116585