We report the structural phase transition properties of the newly discovered K0.8Fe1.6Se2 superconductor (T c =31.8 K) using synchrotron single-crystal X-ray diffraction. The basic structure of the sample at room temperature is found to be tetragonal ThCr2Si2-type, modulated by a vacancy ordering induced superlattice structure together with a coexisting minority phase having a √2×√2 ordering. At 520 K, the reflections corresponding to the √2×√2 phase merge with the parent tetragonal phase. The superlattice peaks corresponding to the vacancy ordering disappear at 580 K, indicating an order-disorder phase transition at this temperature.

Temperature Dependence of $\sqrt{2} \times \sqrt{2}$ Phase in Superconducting K0.8Fe1.6Se2 Single Crystal / A., Ricci; B., Joseph; Poccia, Nicola; Campi, Gaetano; Saini, Naurang Lal; Bianconi, Antonio. - In: JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM. - ISSN 1557-1939. - STAMPA. - 27:4(2013), pp. 1003-1007. [10.1007/s10948-013-2426-7]

Temperature Dependence of $\sqrt{2} \times \sqrt{2}$ Phase in Superconducting K0.8Fe1.6Se2 Single Crystal

POCCIA, NICOLA;CAMPI, GAETANO;SAINI, Naurang Lal;BIANCONI, Antonio
2013

Abstract

We report the structural phase transition properties of the newly discovered K0.8Fe1.6Se2 superconductor (T c =31.8 K) using synchrotron single-crystal X-ray diffraction. The basic structure of the sample at room temperature is found to be tetragonal ThCr2Si2-type, modulated by a vacancy ordering induced superlattice structure together with a coexisting minority phase having a √2×√2 ordering. At 520 K, the reflections corresponding to the √2×√2 phase merge with the parent tetragonal phase. The superlattice peaks corresponding to the vacancy ordering disappear at 580 K, indicating an order-disorder phase transition at this temperature.
2013
01 Pubblicazione su rivista::01a Articolo in rivista
Temperature Dependence of $\sqrt{2} \times \sqrt{2}$ Phase in Superconducting K0.8Fe1.6Se2 Single Crystal / A., Ricci; B., Joseph; Poccia, Nicola; Campi, Gaetano; Saini, Naurang Lal; Bianconi, Antonio. - In: JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM. - ISSN 1557-1939. - STAMPA. - 27:4(2013), pp. 1003-1007. [10.1007/s10948-013-2426-7]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/620388
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