Fe-site substitution effects on superconductivity and microstructure of phase-separated K0.8Fe1.75Se2 superconductor

Z. A. Sun; Z. Wang; Y. Cai; Z. W. Wang; H. X. Yang; H. F. Tian; S. L. Wu; R. X. Zhang; C. Ma; B. Zhang; J. Q. Li

doi:10.1209/0295-5075/105/57002

Fe-site substitution effects on superconductivity and microstructure of phase-separated K_0.8Fe_1.75Se₂ superconductor

Z. A. Sun, Z. Wang, Y. Cai, Z. W. Wang, H. X. Yang^*, H. F. Tian, S. L. Wu, R. X. Zhang, C. Ma, B. Zhang, J. Q. Li

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

6 Citations (Scopus)

Abstract

Series of Fe-site-substituted K_0.8Fe_1.75-xM _xSe2 (M = Cu, Ni, Mn, Zn, Co, Cr) single crystals of nominal composition have been prepared and microstructural features have been studied. Systematic Transmission Electron Microscopy (TEM) and Scanning Electron Microscopy (SEM) investigations reveal that the substitution effect can be classified into two types: Ni, Co and Cr atoms can be homogenously doped into the superconducting stripes of the phase-separated K_0.8Fe _1.75Se₂ system, while the Cu, Mn and Zn atoms can hardly be introduced into the superconducting stripes, which instead give rise to the formation of new non-superconducting K-M-Se phases embedded in the sample. The complex physical measurement data reported in the literature can be nicely explained by the microstructure picture.

Original language	English
Article number	57002
Journal	Europhysics Letters
Volume	105
Issue number	5
DOIs	https://doi.org/10.1209/0295-5075/105/57002
Publication status	Published - Mar 2014
Externally published	Yes

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title = "Fe-site substitution effects on superconductivity and microstructure of phase-separated K0.8Fe1.75Se2 superconductor",

abstract = "Series of Fe-site-substituted K0.8Fe1.75-xM xSe2 (M = Cu, Ni, Mn, Zn, Co, Cr) single crystals of nominal composition have been prepared and microstructural features have been studied. Systematic Transmission Electron Microscopy (TEM) and Scanning Electron Microscopy (SEM) investigations reveal that the substitution effect can be classified into two types: Ni, Co and Cr atoms can be homogenously doped into the superconducting stripes of the phase-separated K0.8Fe 1.75Se2 system, while the Cu, Mn and Zn atoms can hardly be introduced into the superconducting stripes, which instead give rise to the formation of new non-superconducting K-M-Se phases embedded in the sample. The complex physical measurement data reported in the literature can be nicely explained by the microstructure picture.",

author = "Sun, {Z. A.} and Z. Wang and Y. Cai and Wang, {Z. W.} and Yang, {H. X.} and Tian, {H. F.} and Wu, {S. L.} and Zhang, {R. X.} and C. Ma and B. Zhang and Li, {J. Q.}",

year = "2014",

month = mar,

doi = "10.1209/0295-5075/105/57002",

language = "English",

volume = "105",

journal = "Europhysics Letters",

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TY - JOUR

T1 - Fe-site substitution effects on superconductivity and microstructure of phase-separated K0.8Fe1.75Se2 superconductor

AU - Sun, Z. A.

AU - Wang, Z.

AU - Cai, Y.

AU - Wang, Z. W.

AU - Yang, H. X.

AU - Tian, H. F.

AU - Wu, S. L.

AU - Zhang, R. X.

AU - Ma, C.

AU - Zhang, B.

AU - Li, J. Q.

PY - 2014/3

Y1 - 2014/3

N2 - Series of Fe-site-substituted K0.8Fe1.75-xM xSe2 (M = Cu, Ni, Mn, Zn, Co, Cr) single crystals of nominal composition have been prepared and microstructural features have been studied. Systematic Transmission Electron Microscopy (TEM) and Scanning Electron Microscopy (SEM) investigations reveal that the substitution effect can be classified into two types: Ni, Co and Cr atoms can be homogenously doped into the superconducting stripes of the phase-separated K0.8Fe 1.75Se2 system, while the Cu, Mn and Zn atoms can hardly be introduced into the superconducting stripes, which instead give rise to the formation of new non-superconducting K-M-Se phases embedded in the sample. The complex physical measurement data reported in the literature can be nicely explained by the microstructure picture.

AB - Series of Fe-site-substituted K0.8Fe1.75-xM xSe2 (M = Cu, Ni, Mn, Zn, Co, Cr) single crystals of nominal composition have been prepared and microstructural features have been studied. Systematic Transmission Electron Microscopy (TEM) and Scanning Electron Microscopy (SEM) investigations reveal that the substitution effect can be classified into two types: Ni, Co and Cr atoms can be homogenously doped into the superconducting stripes of the phase-separated K0.8Fe 1.75Se2 system, while the Cu, Mn and Zn atoms can hardly be introduced into the superconducting stripes, which instead give rise to the formation of new non-superconducting K-M-Se phases embedded in the sample. The complex physical measurement data reported in the literature can be nicely explained by the microstructure picture.

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ER -

Fe-site substitution effects on superconductivity and microstructure of phase-separated K_0.8Fe_1.75Se₂ superconductor

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