Awana, V. P. S. and Kumar, Anuj and Pal, Anand (2012) Control of interstitial Fe and its impact on superconductivity of FeTe1/2Se1/2. In: 56th DAE-Solid State Physics Symposium (SSPS), DEC 19-23, 2011, SRM Univ, Kattankulathur, INDIA.

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The FeTe1/2Se1/2 samples are quenched during the vacuum sealed synthesis process to room temperature from 700 degrees C, 500 degrees C, 300 degrees C and room temperature (RT); named as 700Q, 500Q, 300Q and RTQ respectively. Though all samples except 700Q are crystallized in single phase with space group P4/nmm, the presence of interstitial Fe (Fe-int) at 2c site is increased from 5% for RTQ to 8% for 500Q. The 700Q sample is crystallized in Fe7Se8 phase. Also though the RTQ and 300Q are superconducting at 10 K and 13 K respectively, the 500Q and 700Q are not. Magnetic ordering (T-mag) is observed at around 125 K for all the samples. The prominence of T-mag in terms of effective moment is sufficiently higher for 500Q and 700Q than RTQ and 300Q. Summarily, it is found that quenching induced disorder affects the occupancy of Fe-int in FeTe1/2Se1/2 and thus both its superconducting and magnetic properties.

Item Type: Conference or Workshop Item (Paper)
Additional Information: SOLID STATE PHYSICS, PTS 1 AND 2 Edited by:Mittal, R; Chauhan, AK; Mukhopadhyay, R Book Series: AIP Conference Proceedings Volume: 1447 Pages: 869-870 DOI: 10.1063/1.4710278 Published: 2012 Document Type:Proceedings Paper
Subjects: Applied Physics/Condensed Matter
Depositing User: Users 27 not found.
Date Deposited: 07 Feb 2020 07:44
Last Modified: 07 Feb 2020 07:44

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