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Investigating the vibrational lattice anisotropy in FeTe0.5Se0.5 using magnetically oriented crystallites
Solid State Communications ( IF 2.1 ) Pub Date : 2020-05-01 , DOI: 10.1016/j.ssc.2020.113877
Reijo Pohjonen , Fredrik Lindroos , Girish C. Tewari , Johan Lindén

Abstract An iron chalcogenide sample with nominal composition FeTe0.5Se0.5 was synthesized following a solid-state reaction route. X-ray diffraction followed by Rietveld analysis were used for verifying the phase content. Using the field of an 11.7 T magnet textured samples, having the c axes parallel with and normal to the sample surface, were made. 57Fe Mossbauer spectroscopy in transmission geometry was used for characterizing the hyperfine parameters of the iron site. Clear indications of vibrational anisotropy, i.e. the Goldanskii-Karyagin effect, were observed. Fitting spectral absorption with the Debye model yielded rather low Debye temperatures of 255(3) and 303(3) K, for samples texturized with the c axis parallel with and perpendicular to the Mossbauer γ beam, respectively. Also the second-order Doppler shift of the isomer shift data exhibited a similar, although weaker, anisotropy.

中文翻译:

使用磁取向微晶研究 FeTe0.5Se0.5 中的振动晶格各向异性

摘要 按照固态反应路线合成了标称组成为 FeTe0.5Se0.5 的硫属元素铁样品。X射线衍射和Rietveld分析用于验证相含量。使用 11.7 T 磁体纹理样品的场,制作了 c 轴平行并垂直于样品表面的样品。透射几何中的 57Fe Mossbauer 光谱用于表征铁位点的超精细参数。观察到明显的振动各向异性迹象,即 Goldanskii-Karyagin 效应。用德拜模型拟合光谱吸收产生相当低的德拜温度,分别为 255(3) 和 303(3) K,对于纹理化的样品,c 轴分别平行于和垂直于 Mossbauer γ 光束。
更新日期:2020-05-01
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