A 57Fe Mossbauer study on the FeSe and Fe(Se,Te) superconductors: discontinuities in the hyperfine parameters at Tc

被引：7
|
作者：
Linden, Johan Kaarle Mikael [1 ]
Rautama, Eeva-Leena [2 ]
Karppinen, Maarit [2 ]
Yamauchi, Hisao [2 ]
机构：
[1] Abo Akad Univ, Dept Phys, SF-20500 Turku, Finland
[2] Aalto Univ Sch Sci & Technol, Dept Chem, Aalto 00076, Finland
来源：
HYPERFINE INTERACTIONS | 2012年 / 208卷 / 1-3期
关键词：
Fe-57 Mossbauer spectroscopy; Chalcogenide superconductivity; Iron-based superconductors;
D O I：
10.1007/s10751-011-0482-6
中图分类号：
O64 [物理化学（理论化学）、化学物理学]; O56 [分子物理学、原子物理学];
学科分类号：
070203 ; 070304 ; 081704 ; 1406 ;
摘要：
Polycrystalline samples of FeSe0.82 and FeSe0.5Te0.5 were synthesized using a solid-state reaction route. Bulk superconductivity was confirmed using SQUID magnetometry. The onset of T-c was at 8.0 K for FeSe0.82 and 12.5 K for FeSe0.5Te0.5. Paramagnetic Fe-57 Mossbauer spectra were recorded at temperatures between 5.4 and 320 K in transmission geometry. All spectra exhibited simple quadrupole splitting. For FeSe0.5Te0.5 a small drop in the quadrupole splitting was observed about T-c upon cooling. Additionally, for both samples the isomer shift and the total absorption started to drop around T-c, indicating a softening of the lattice. The drop is estimated to correspond to at least 60 K from the original Debye temperatures.
引用
收藏
页码：133 / 136
页数：4
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