Role of interstitial "caged" Fe in the superconductivity of FeTe12Se12

Anuj Kumar, Anand Pal, R. P. Tandon, V. P.S. Awana

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11 Citations (Scopus)


All samples are synthesized through a standard solid state reaction route and are quenched to room temperature systematically at 700 °C, 500 °C, 300 °C, and room temperature (RT); the samples are denoted 700Q, 500Q, 300Q, and RTQ, respectively. The structural, and magnetic properties are studied. Careful Rietveld analysis of the X-ray diffraction patterns revealed that all samples except 700Q crystallized in a single phase with space group P4/nmm; the amount of interstitial Fe (Feint) at the 2c site increased from 5% for RTQ to 8% for 500Q. Sample 700Q crystallized in the Fe7Se 8 phase. The magnetization result revealed that RTQ and 300Q are superconducting at 10 K and 13 K, respectively, while 500Q and 700Q are not superconducting. Magnetic ordering (Tmag) was 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 for RTQ and 300Q. Summarily, it is found that quenching-induced disorder affects the occupancy of interstitial Fe in FeTe12Se12 and thus both its superconducting and magnetic properties. Further, it clear that limited presence of interstitial Fe at 2c site is not completely contrary to the observation of superconductivity, because the 300Q sample possesses higher Tc (13 K) for higher Feint (6%) than the RTQ sample with relatively lower Tc (10 K) having lower Feint (5%). Further, the 500Q sample, with much higher Feint (8%), is non-superconducting.

Original languageEnglish
Pages (from-to)1767-1770
Number of pages4
JournalSolid State Communications
Issue number23
Publication statusPublished - 12-2011

All Science Journal Classification (ASJC) codes

  • General Chemistry
  • Condensed Matter Physics
  • Materials Chemistry


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