TY - GEN
T1 - Control of interstitial Fe and its impact on superconductivity of FeTe 1/2Se1/2
AU - Awana, V. P.S.
AU - Kumar, Anuj
AU - Pal, Anand
PY - 2012
Y1 - 2012
N2 - The FeTe1/2Se1/2 samples are quenched during the vacuum sealed synthesis process to room temperature from 700°C, 500°C, 300°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 (Feint) 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 (Tmag) is observed at around 125 K for all the samples. The prominence of Tmag 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 Feint in FeTe1/2Se1/2 and thus both its superconducting and magnetic properties.
AB - The FeTe1/2Se1/2 samples are quenched during the vacuum sealed synthesis process to room temperature from 700°C, 500°C, 300°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 (Feint) 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 (Tmag) is observed at around 125 K for all the samples. The prominence of Tmag 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 Feint in FeTe1/2Se1/2 and thus both its superconducting and magnetic properties.
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U2 - 10.1063/1.4710278
DO - 10.1063/1.4710278
M3 - Conference contribution
AN - SCOPUS:84876786299
SN - 9780735410442
T3 - AIP Conference Proceedings
SP - 869
EP - 870
BT - Solid State Physics - Proceedings of the 56th DAE Solid State Physics Symposium 2011
T2 - 56th DAE Solid State Physics Symposium 2011
Y2 - 19 December 2011 through 23 December 2011
ER -