Conţinutul numărului revistei |
Articolul precedent |
Articolul urmator |
227 0 |
SM ISO690:2012 KSENOFONTOV, Vadim G., WORTMANN, Gerhard, MEDVEDEV, Sergey A., TSURKAN, Vladimir, DEISENHOFER, Joachim, LOIDL, Alois, FELSER, Claudia. Phase separation in superconducting and antiferromagnetic Rb 0.8Fe1.6Se2 probed by Mössbauer spectroscopy. In: Physical Review B - Condensed Matter and Materials Physics, 2011, vol. 84, pp. 1-11. ISSN 1098-0121. DOI: https://doi.org/10.1103/PhysRevB.84.180508 |
EXPORT metadate: Google Scholar Crossref CERIF DataCite Dublin Core |
Physical Review B - Condensed Matter and Materials Physics | |
Volumul 84 / 2011 / ISSN 1098-0121 /ISSNe 1550-235X | |
|
|
DOI:https://doi.org/10.1103/PhysRevB.84.180508 | |
Pag. 1-11 | |
Rezumat | |
57Fe-Mössbauer studies of superconducting Rb0.8Fe 1.6Se2.0 with TC = 32.4 K were performed on single-crystalline and polycrystalline samples in the temperature range 4.2-295 K. They reveal the presence of 88% magnetic and 12% nonmagnetic Fe2+ species with the same polarization dependence of their hyperfine spectra. The magnetic species are attributed to the 16i sites of the √5×√ 5×1 superstructure and the nonmagnetic Fe species to a nanosized phase observed in recent structural studies of superconducting KxFe 2-ySe2 systems rather than to the vacant 4d sites in the √5×√5×1 superstructure. The 57Fe spectrum of a single-crystalline sample in an external field of 50 kOe applied parallel to the crystallographic c axis confirms the antiferromagnetic order between the fourfold ferromagnetic Fe(16i) supermoments and the absence of a magnetic moment at the Fe sites in the minority phase. A discussion of all spectral information and comparison with superconducting FeSe provides convincing evidence that the nanoscale phase separation is monitored by Mössbauer spectroscopy in Rb0.8Fe1.6Se2.0. |
|
Cuvinte-cheie Iron-based Superconductors, Group 5A Compounds, superconductivity |
|
|