Phase separation in RbxFe2−ySe2probed by non-stoichiometry and cu doping

Shylin SI, Ksenofontov V, Medvedev SA, Tsurkan V, Felser C (2015)

Publication Type: Journal article

Publication year: 2015

Journal

Journal of Superconductivity and Novel Magnetism Springer Verlag (Germany)

Book Volume: 28

Pages Range: 1315-1319

Journal Issue: 4

DOI: 10.1007/s10948-014-2912-6

Abstract

The paper presents Mössbauer spectroscopy investigation on superconducting Rb0.8Fe1.6Se2 exhibiting nanoscale phase separation and two its derivatives: Cu-doped Rb0.8Fe1.56Cu0.04Se2and Fe-deficient Rb0.7Fe1.4Se2. The spectra reveal the presence of the same dominant magnetic sextet in the samples, which is assigned to the Fe 16i sites of the √ 5 × √ 5 × 1 superstructure. This magnetic part is independent on the modification of the sample and does not undergo any changes after doping or deviation of stoichiometry. In contrast, the minor non-magnetic doublet in the spectra of Rb0.8Fe1.6Se2, which is attributed to the superconducting nanoscale phase, is sensitive to such modifications. After doping with Cu, the relative intensity of non-magnetic doublet significantly decreases together with suppression of superconductivity. On the other hand, the Fe-deficient sample is entirely magnetically ordered below 250 K including in the minor nanoscale phase. A discussion of Mössbauer spectroscopic data and comparison with previous studies on other Fe chalcogenide analogues allow to conclude the nanosized phase separation is also observed in non-stoichiometric and doped modifications of Rb0.8Fe1.6Se2.

Involved external institutions

Johannes Gutenberg-Universität Mainz (JGU) DE Germany (DE) Max-Planck-Institut für Chemische Physik fester Stoffe (MPI CPfS) / Max Planck Institute for Chemical Physics of Solids DE Germany (DE) Universität Augsburg DE Germany (DE)

How to cite

APA:

Shylin, S.I., Ksenofontov, V., Medvedev, S.A., Tsurkan, V., & Felser, C. (2015). Phase separation in RbxFe2−ySe2probed by non-stoichiometry and cu doping. Journal of Superconductivity and Novel Magnetism, 28(4), 1315-1319. https://doi.org/10.1007/s10948-014-2912-6

MLA:

Shylin, Sergii I., et al. "Phase separation in RbxFe2−ySe2probed by non-stoichiometry and cu doping." Journal of Superconductivity and Novel Magnetism 28.4 (2015): 1315-1319.

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