Mössbauer spectroscopy evidence for the lack of iron magnetic moment in superconducting FeSe

Błachowski, A.; Ruebenbauer, K.; Żukrowski, J.; Przewoźnik, J.; Wojciechowski, K.; Stadnik, Z. M.

doi:10.1016/j.jallcom.2009.12.095

Cited by 49 publications

(56 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Two of them belong to the minor phases with the total contribution of about 7 %. One of these phases (3 %) is superconducting FeSe [2]. Hence, there are four different iron sites in magnetically ordered BaFe 2 Se 3 .…”

Section: Resultsmentioning

confidence: 99%

“…Generally, one observes that metallic iron-selenium compounds are prone to the loss of iron magnetic moment and therefore some of them can exhibit superconductivity at low temperature [2]. On the other hand, iron-selenium compounds being semiconductors exhibit iron magnetic moment characteristic of the Fe 2+ configuration -typically of the 2 = S configuration.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Magnetism of BaFe2Se3 studied by Mössbauer spectroscopy

Komędera

Jasek

Błachowski

et al. 2015

Solid State Communications

Self Cite

View full text Add to dashboard Cite

The compound BaFe 2 Se 3 (Pnma) has been synthesized in the form of single crystals with the average composition Ba 0.992 Fe 1.998 Se 3 . The Mössbauer spectroscopy used for investigation of the valence states of Fe in this compound at temperature ranging from 4.2 K till room temperature revealed the occurrence of mixed-valence state for iron. The spectrum is characterized by sharply defined electric quadrupole doublet above magnetic ordering at about 250 K. For the magnetically ordered state one sees four iron sites at least and each of them is described by separate axially symmetric electric field gradient tensor with the principal component making some angle with the hyperfine magnetic field. They form two groups occurring in equal abundances. It is likely that each group belongs to separate spin ladder with various tilts of the FeSe 4 tetrahedral units along the ladder. Two impurity phases are found, i.e., superconducting FeSe and some other unidentified iron-bearing phase being magnetically disordered above 80 K. Powder form of BaFe 2 Se 3 is unstable in contact with the air and decomposes slowly to this unidentified phase exhibiting almost the same quadrupole doublet as BaFe 2 Se 3 above magnetic transition temperature.2

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Magnetism of BaFe2Se3 studied by Mössbauer spectroscopy

Komędera

Jasek

Błachowski

et al. 2015

Solid State Communications

Self Cite

View full text Add to dashboard Cite

show abstract

“…Various spectra from superconductive samples have established that the spin state of Fe is zero or close to zero. [6,7] This is true at least within the characteristic time-scale of ∼ 100 ns of the 57 Fe transition. However, presence of antiferromagnetic fluctuations has been suggested [8,9] but may be difficult to be detected by Mössbauer spectroscopy.…”

Section: Introductionmentioning

confidence: 80%

“…It is readily indexed by the PbO-type tetragonal structure of space group P4/nmm (isostructural with β−FeSe). Impurity peaks assigned mainly to hexagonal Te-substituted δ-FeSe [6] and/or Fe 7 Se 8 are observed. Additionally, presence of Fe 3 O 4 , confirmed by SQUID and Mössbauer spectroscopy measurements, is seen.…”

Section: Methodsmentioning

confidence: 95%

Observation of lattice softening at Tc in the FeSe0.5Te0.5 superconductor

Lindén

Liback

Karppinen

et al. 2011

Solid State Communications

View full text Add to dashboard Cite

Polycrystalline samples of FeSe 0.5 Te 0.5 were synthesized using a conventional solid-state reaction method. The onset of bulk superconductivity transition was confirmed by SQUID magnetometry at 12.5 K.57 Fe Mössbauer spectra in transmission geometry were recorded at temperatures between 6.0 and 320 K. Both the isomer shift and the total absorption started to drop about T c , indicating a softening of the lattice. The drop is estimated to correspond to at least 60 K from the original Debye temperature θ D ≈ 460 K. Seebeck measurements indicate that the samples are n-type conductors at low temperatures with a cross-over to p-type conductivity around 135 K. The zero Seebeck coefficient is seen below 10.6 K.

show abstract

“…However, similar results have been reported for Fe 2+ located at the tetrahedral sites of binary oxides and chalcogenides. Examples include δ = 0.84(3) mm/s, E Q = 0.35(3) mm/s for impurity Fe 2+ implanted in single crystal, hexagonal ZnO [39], and ranges of δ ≈ 0.4-0.6 mm/s, E Q = 0.2-0.3 mm/s with relatively small temperature dependence for FeSe [40][41][42], FeTe [41,42], and Fe 1−x Mn x Se 0.85 [43]. In the case of the chalcogenides, the slightly smaller isomer shift value has led some authors to conclude that the Fe 2+ is in its low spin (S = 0) state.…”

Section: Magnetic Properties Of β-Ce 2 O 2 Fesementioning

confidence: 99%

Crystal structure and magnetic modulation in β−Ce2O2FeSe2

Wang

Ainsworth

Champion

et al. 2017

Phys. Rev. Materials

View full text Add to dashboard Cite

Publisher's copyright statement:Reprinted with permission from the American Physical Society: Wang, Chun-Hai, Ainsworth, C. M., Champion, S. D., Stewart, G. A., Worsdale, M. C., Lancaster, T., Blundell, S. J., Brand, Helen E. A. Evans, John S. O. (2017). Crystal structure and magnetic modulation in Ce2O2FeSe2. Physical Review Materials 1(3): 034403 c 2017 by the American Physical Society. Readers may view, browse, and/or download material for temporary copying purposes only, provided these uses are for noncommercial personal purposes. Except as provided by law, this material may not be further reproduced, distributed, transmitted, modi ed, adapted, performed, displayed, published, or sold in whole or part, without prior written permission from the American Physical Society.Additional information: Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-pro t purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. We report a combination of x-ray and neutron diffraction studies, Mössbauer spectroscopy, and muon spin relaxation (μ + SR) measurements to probe the structure and magnetic properties of the semiconducting β-Ce 2 O 2 FeSe 2 oxychalcogenide. We report a structural description in space group P na2 1 which is consistent with diffraction data and second harmonic generation measurements and reveal an order-disorder transition on one Fe site at T OD ≈ 330 K. Susceptibility measurements, Mössbauer, and μ + SR reveal antiferromagnetic ordering below T N = 86 K and more complex short range order above this temperature. 12 K neutron diffraction data reveal a modulated magnetic structure with q = 0.444b N * .

show abstract

Mössbauer spectroscopy evidence for the lack of iron magnetic moment in superconducting FeSe

Cited by 49 publications

References 26 publications

Magnetism of BaFe2Se3 studied by Mössbauer spectroscopy

Magnetism of BaFe2Se3 studied by Mössbauer spectroscopy

Observation of lattice softening at Tc in the FeSe0.5Te0.5 superconductor

Crystal structure and magnetic modulation in β−Ce2O2FeSe2

Contact Info

Product

Resources

About