Crystal growth and characterization of Fe$_{1+δ}$Se$_{1-x}$Te$_x$ (0.5 $\leq$ $x$ $\leq$ 1) from LiCl/KCl flux
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| Autores principales: | , , , , , , , , , , , |
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| Formato: | Preprint |
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2024
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| _version_ | 1866908017207803904 |
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| author | Wang, Qiaoyu Bi, Kexin Chen, Lewei Shi, Yunqing Yi, Junkun Gu, Yadong Zhou, Menghu Ruan, Binbin Lu, Xingye Ma, Mingwei Chen, Genfu Ren, Zhian |
| author_facet | Wang, Qiaoyu Bi, Kexin Chen, Lewei Shi, Yunqing Yi, Junkun Gu, Yadong Zhou, Menghu Ruan, Binbin Lu, Xingye Ma, Mingwei Chen, Genfu Ren, Zhian |
| contents | An eutectic LiCl/KCl flux method in a horizontal configuration has been used to grow a series of homogeneous Fe$_{1+δ}$Se$_{1-x}$Te$_x$ single crystals of high quality with 0.5 $\leq$ $x$ $\leq$ 1. Compared with previously used melt-growth method, the stable crystallization process in LiCl/KCl flux below their peritectic temperatures results in better homogeneity and crystalline perfection identified by energy dispersive spectrometer and x-ray diffraction. The interstitial Fe value $δ$ remains small within 0.5 $\leq$ $x$ $\leq$ 0.85 where the superconducting temperature $T_C$ is not sensitive to the Te content with sharp superconducting transition widths $Δ$$T_C$ < 1 K and a maximum of $T_C$ = 14.3 K at $x$ = 0.61. The value $δ$ starts to increase quickly accompanied by a deviation of linear behavior of crystal lattice parameters as well as the broadening of $Δ$$T_C$ = 2.1 K at $x$ = 0.91, then suddenly rises up to $δ$ > 0.1 followed by the disappearance of superconductivity and emergence of antiferromagnetic order at x $\geq$ 0.96. We also observed a metallic to semiconducting transition in the normal state resistivity of Fe$_{1+δ}$Se$_{1-x}$Te$_x$ with increasing Te content which is related to a localized electronic state induced by the interstitial Fe. The interstitial Fe value $δ$ might be a key physical parameter to understand various properties of Fe$_{1+δ}$Se$_{1-x}$Te$_x$ system. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2408_09388 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Crystal growth and characterization of Fe$_{1+δ}$Se$_{1-x}$Te$_x$ (0.5 $\leq$ $x$ $\leq$ 1) from LiCl/KCl flux Wang, Qiaoyu Bi, Kexin Chen, Lewei Shi, Yunqing Yi, Junkun Gu, Yadong Zhou, Menghu Ruan, Binbin Lu, Xingye Ma, Mingwei Chen, Genfu Ren, Zhian Superconductivity Strongly Correlated Electrons An eutectic LiCl/KCl flux method in a horizontal configuration has been used to grow a series of homogeneous Fe$_{1+δ}$Se$_{1-x}$Te$_x$ single crystals of high quality with 0.5 $\leq$ $x$ $\leq$ 1. Compared with previously used melt-growth method, the stable crystallization process in LiCl/KCl flux below their peritectic temperatures results in better homogeneity and crystalline perfection identified by energy dispersive spectrometer and x-ray diffraction. The interstitial Fe value $δ$ remains small within 0.5 $\leq$ $x$ $\leq$ 0.85 where the superconducting temperature $T_C$ is not sensitive to the Te content with sharp superconducting transition widths $Δ$$T_C$ < 1 K and a maximum of $T_C$ = 14.3 K at $x$ = 0.61. The value $δ$ starts to increase quickly accompanied by a deviation of linear behavior of crystal lattice parameters as well as the broadening of $Δ$$T_C$ = 2.1 K at $x$ = 0.91, then suddenly rises up to $δ$ > 0.1 followed by the disappearance of superconductivity and emergence of antiferromagnetic order at x $\geq$ 0.96. We also observed a metallic to semiconducting transition in the normal state resistivity of Fe$_{1+δ}$Se$_{1-x}$Te$_x$ with increasing Te content which is related to a localized electronic state induced by the interstitial Fe. The interstitial Fe value $δ$ might be a key physical parameter to understand various properties of Fe$_{1+δ}$Se$_{1-x}$Te$_x$ system. |
| title | Crystal growth and characterization of Fe$_{1+δ}$Se$_{1-x}$Te$_x$ (0.5 $\leq$ $x$ $\leq$ 1) from LiCl/KCl flux |
| topic | Superconductivity Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2408.09388 |