Evidence of the Plaquette Structure of Fe 1+x Te Iron Telluride: Mössbauer Spectroscopy Study
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KIIAMOV, A.; TAGIROV, Lenar; VAGIZOV, F.; TAYURSKII, Dmitrii; KRUG VON NIDDA, Hans Albrecht; CROITORI, Dorina; TSURKAN, Vladimir; LOIDL, Alois. Evidence of the Plaquette Structure of Fe 1+x Te Iron Telluride: Mössbauer Spectroscopy Study. In: Physica Status Solidi (B) Basic Research. 2019, nr. 2019, p. 0. ISSN 0370-1972.
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Physica Status Solidi (B) Basic Research
Numărul 2019 / 2019 / ISSN 0370-1972

Evidence of the Plaquette Structure of Fe 1+x Te Iron Telluride: Mössbauer Spectroscopy Study


DOI: 10.1002/pssb.201800698
Pag. 0-0

Kiiamov A.1, Tagirov Lenar12, Vagizov F.1, Tayurskii Dmitrii1, Krug Von Nidda Hans Albrecht3, Croitori Dorina4, Tsurkan Vladimir43, Loidl Alois3
 
1 Kazan Federal University,
2 Kazan E.K. Zavoisky Physical-Technical Institute, Kazan,
3 University of Augsburg,
4 Institute of Applied Physics
 
Disponibil în IBN: 3 aprilie 2019


Rezumat

Single-crystalline Fe 1+x Te iron telluride with off-stoichiometric iron has been synthesized by the Bridgman method. The X-ray diffraction and wave-length-dispersive X-ray electron-probe microanalysis characterization have shown Fe 1.125 Te stoichiometry of the samples. Spin-polarized ab initio calculations of the electric field gradients around interstitial iron atoms for Fe 1.125 Te have shown that in the first and second coordination rings around interstitial iron, the spin and electron densities are strongly perturbed against the stoichiometric ones. Together with the interstitial iron this gives rise to three kinds of iron centers making up a round-corner plaquette. The room-temperature Mössbauer spectra measured at different incidence angles of gamma-radiation are satisfactorily fitted utilizing the hyperfine parameters, calculated within the plaquette model. The low-temperature data are well described with the assumption of an incommensurate collinear spin density wave (SDW) phase, showing consistency with neutron scattering data for the Fe 1.125 Te system.

Cuvinte-cheie
ab initio calculations, iron chalcogenides, Mössbauer spectroscopy