Effect of low Zn doping on the Verwey transition in magnetite single crystals: Mossbauer spectroscopy and x-ray diffraction

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F18%3A10386239" target="_blank" >RIV/00216208:11320/18:10386239 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/68378271:_____/18:00494651

Výsledek na webu

<a href="https://doi.org/10.1103/PhysRevB.98.125138" target="_blank" >https://doi.org/10.1103/PhysRevB.98.125138</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1103/PhysRevB.98.125138" target="_blank" >10.1103/PhysRevB.98.125138</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Effect of low Zn doping on the Verwey transition in magnetite single crystals: Mossbauer spectroscopy and x-ray diffraction

Popis výsledku v původním jazyce

To observe, by microscopic probe, how low Zn doping in Fe3-xZnxO4 (x is below 1%) changes the Verwey transition, we have performed Mossbauer spectroscopy measurements on three single crystalline samples with various Zn doping. In spectra analysis we used the recently published model of Mossbauer data treatment formulated as a result of ab initio calculations for a low-temperature monoclinic structure (of Cc symmetry) of magnetite. It was suggested there that the hyperfine parameters for all 24 Fe distinct positions in the lattice can be grouped into four major components with very similar hyperfine parameters within each set. Using these parameters as starting values, very good fits were obtained for magnetite with low doping level, while for higher doping, x = 0.03, where the Verwey transition changes its character, one component is significantly different. In particular, low hyperfine field B-eff = 36 T, considered as a characteristic feature of the Cc phase spectrum, is absent here. Also, in this case, the high-temperature spectra are different from those for lower doped magnetite showing more pronounced continuous alteration with temperature. This might be due to crystal structure of lower than Fd-3m symmetry, a fact suggested by our x-ray synchrotron studies. All this triggered a discussion about an experimental fingerprint for the difference between these two classes of magnetite, frequently referred to as magnetite of first- and second-order Verwey transition, and about the electronic structure of both kinds of systems.

Název v anglickém jazyce

Effect of low Zn doping on the Verwey transition in magnetite single crystals: Mossbauer spectroscopy and x-ray diffraction

Popis výsledku anglicky

To observe, by microscopic probe, how low Zn doping in Fe3-xZnxO4 (x is below 1%) changes the Verwey transition, we have performed Mossbauer spectroscopy measurements on three single crystalline samples with various Zn doping. In spectra analysis we used the recently published model of Mossbauer data treatment formulated as a result of ab initio calculations for a low-temperature monoclinic structure (of Cc symmetry) of magnetite. It was suggested there that the hyperfine parameters for all 24 Fe distinct positions in the lattice can be grouped into four major components with very similar hyperfine parameters within each set. Using these parameters as starting values, very good fits were obtained for magnetite with low doping level, while for higher doping, x = 0.03, where the Verwey transition changes its character, one component is significantly different. In particular, low hyperfine field B-eff = 36 T, considered as a characteristic feature of the Cc phase spectrum, is absent here. Also, in this case, the high-temperature spectra are different from those for lower doped magnetite showing more pronounced continuous alteration with temperature. This might be due to crystal structure of lower than Fd-3m symmetry, a fact suggested by our x-ray synchrotron studies. All this triggered a discussion about an experimental fingerprint for the difference between these two classes of magnetite, frequently referred to as magnetite of first- and second-order Verwey transition, and about the electronic structure of both kinds of systems.

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

2018

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

98

Číslo periodika v rámci svazku

12

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

9

Strana od-do

—

Kód UT WoS článku

000445508200008

EID výsledku v databázi Scopus

2-s2.0-85053875042