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

0494651 - FZÚ 2019 RIV US eng J - Journal Article
Chlan, V. - Żukrowski, J. - Bosak, A. - Kakol, Z. - Kozlowski, A. - Tarnawski, Z. - Řezníček, R. - Štěpánková, H. - Novák, Pavel - Bialo, I. - Honig, J.M.
Effect of low Zn doping on the Verwey transition in magnetite single crystals: Mossbauer spectroscopy and x-ray diffraction.
Physical Review B. Roč. 98, č. 12 (2018), s. 1-9, č. článku 125138. ISSN 2469-9950. E-ISSN 2469-9969
Institutional support: RVO:68378271
Keywords : magnetic interactions * crystal phenomena * structural properties * crystal symmetry
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Impact factor: 3.736, year: 2018

To observe, by microscopic probe, how low Zn doping in Fe3-xZnxO4 (x is below 1%) changes the Verwey transition, we have performed Mössbauer spectroscopy measurements on three single crystalline samples with various Zn doping. In spectra analysis we used the recently published model of Mössbauer 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.
Permanent Link: http://hdl.handle.net/11104/0287756