Structural disorder in Li&lt;em&gt;&lt;sub&gt;x&lt;/sub&gt;&lt;/em&gt;(C&lt;sub&gt;5&lt;/sub&gt;H&lt;sub&gt;5&lt;/sub&gt;N)&lt;sub&gt;y&lt;/sub&gt;Fe&lt;sub&gt;2-&lt;em&gt;z&lt;/em&gt;&lt;/sub&gt;Se&lt;sub&gt;2&lt;/sub&gt; and Cs&lt;em&gt;&lt;sub&gt;x&lt;/sub&gt;&lt;/em&gt;Fe&lt;sub&gt;2-&lt;em&gt;z&lt;/em&gt;&lt;/sub&gt;Se&lt;sub&gt;2&lt;/sub&gt; superconductors studied by Mössbauer spectroscopy

Komędera, K.; Jasek, A.K.; Błachowski, A.; Ruebenbauer, K.; Zukrowski, J.; Krztoń-Maziopa, A.; Conder, K.

doi:10.1016/j.jmmm.2016.01.003

Structural disorder in Li_x(C₅H₅N)_yFe_2-zSe₂ and Cs_xFe_2-zSe₂ superconductors studied by Mössbauer spectroscopy

Komędera K, Jasek AK, Błachowski A, Ruebenbauer K, Zukrowski J, Krztoń-Maziopa A & Conder K

Citation

Komędera, K., Jasek, A. K., Błachowski, A., Ruebenbauer, K., Zukrowski, J., Krztoń-Maziopa, A., & Conder, K. (2016). Structural disorder in Li_x(C₅H₅N)_yFe_2-zSe₂ and Cs_xFe_2-zSe₂ superconductors studied by Mössbauer spectroscopy. Journal of Magnetism and Magnetic Materials, 406, 244-250. https://doi.org/10.1016/j.jmmm.2016.01.003

Persistent URL https://www.dora.lib4ri.ch/psi/islandora/object/psi:47058

Two iron-chalcogenide superconductors Li_x(C₅H₅N)_yFe_2-zSe₂ and Cs_xFe_2-zSe₂ in the as-prepared and annealed state have been investigated by means of the Mössbauer spectroscopy versus temperature. Multi-component spectra are obtained. One can see a non-magnetic component due to iron located in the unperturbed Fe–Se sheets responsible for superconductivity. Remaining components are magnetically ordered even at room temperature. There is some magnetically ordered iron in Fe–Se sheets perturbed by presence of the iron vacancies. Additionally, one can see iron dispersed between sheets in the form of magnetically ordered high spin trivalent ions, some clusters of above ions, and in the case of pyridine intercalated compound in the form of α-Fe precipitates. Pyridine intercalated sample shows traces of superconductivity in the as-prepared state, while cesium intercalated sample in the as-prepared state does not show any superconductivity. Superconductors with transition temperatures being 40 K and 25 K, respectively, are obtained upon annealing. Annealing leads to removal/ordering of the iron vacancies within Fe–Se sheets, while clusters of α-Fe grow in the pyridine intercalated sample.