Superconducting dome and microstructure properties of Rb0.8Fe1.6+xSe2 superconductors

Zhiwei Wang; Zhen Wang; Yao Cai; Zhen Chen; Chao Ma; Huaixin Yang; Jianqi Li

doi:10.1088/0953-2048/28/7/075001

Superconducting dome and microstructure properties of Rb_0.8Fe_1.6+xSe₂ superconductors

Zhiwei Wang, Zhen Wang, Yao Cai, Zhen Chen, Chao Ma, Huaixin Yang, Jianqi Li

Chinese Academy of Sciences

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

1 Citation (Scopus)

Abstract

High quality Rb_0.8Fe_1.6+xSe₂ single crystals are grown by a one-step melting growth method. Superconductivity has been observed in all samples with x ≥ 0.05 and the maximum critical temperature (T_c) ≈ 32 K has been obtained in samples with 0.1 ≤ x ≤ 0.2 from electronic resistivity measurement. A superconducting dome in the electronic phase diagram of T_c as a function of Fe content has been observed for the first time in this A_xFe_ySe₂ (A = K, Rb) superconducting system. Two coexisting phases with structural modulation vectors of q₁ = 1/5[3a∗ + b∗] and q₂ = 1/2[a∗ + b∗] have been observed in all superconducting samples by TEM observations. Moreover, phase separation in the superconducting crystals, which can be recognized as micro-stripes in the a-b plane, are found to be highly dependent on the Fe content.

Original language	English
Article number	075001
Journal	Superconductor Science and Technology
Volume	28
Issue number	7
DOIs	https://doi.org/10.1088/0953-2048/28/7/075001
Publication status	Published - 13 May 2015
Externally published	Yes

Keywords

RbFeSe
electronic phase diagram
microstructure
superconductor

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10.1088/0953-2048/28/7/075001

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title = "Superconducting dome and microstructure properties of Rb0.8Fe1.6+xSe2 superconductors",

abstract = "High quality Rb0.8Fe1.6+xSe2 single crystals are grown by a one-step melting growth method. Superconductivity has been observed in all samples with x ≥ 0.05 and the maximum critical temperature (Tc) ≈ 32 K has been obtained in samples with 0.1 ≤ x ≤ 0.2 from electronic resistivity measurement. A superconducting dome in the electronic phase diagram of Tc as a function of Fe content has been observed for the first time in this AxFeySe2 (A = K, Rb) superconducting system. Two coexisting phases with structural modulation vectors of q1 = 1/5[3a∗ + b∗] and q2 = 1/2[a∗ + b∗] have been observed in all superconducting samples by TEM observations. Moreover, phase separation in the superconducting crystals, which can be recognized as micro-stripes in the a-b plane, are found to be highly dependent on the Fe content.",

keywords = "RbFeSe, electronic phase diagram, microstructure, superconductor",

author = "Zhiwei Wang and Zhen Wang and Yao Cai and Zhen Chen and Chao Ma and Huaixin Yang and Jianqi Li",

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AU - Wang, Zhiwei

AU - Wang, Zhen

AU - Cai, Yao

AU - Chen, Zhen

AU - Ma, Chao

AU - Yang, Huaixin

AU - Li, Jianqi

PY - 2015/5/13

Y1 - 2015/5/13

N2 - High quality Rb0.8Fe1.6+xSe2 single crystals are grown by a one-step melting growth method. Superconductivity has been observed in all samples with x ≥ 0.05 and the maximum critical temperature (Tc) ≈ 32 K has been obtained in samples with 0.1 ≤ x ≤ 0.2 from electronic resistivity measurement. A superconducting dome in the electronic phase diagram of Tc as a function of Fe content has been observed for the first time in this AxFeySe2 (A = K, Rb) superconducting system. Two coexisting phases with structural modulation vectors of q1 = 1/5[3a∗ + b∗] and q2 = 1/2[a∗ + b∗] have been observed in all superconducting samples by TEM observations. Moreover, phase separation in the superconducting crystals, which can be recognized as micro-stripes in the a-b plane, are found to be highly dependent on the Fe content.

AB - High quality Rb0.8Fe1.6+xSe2 single crystals are grown by a one-step melting growth method. Superconductivity has been observed in all samples with x ≥ 0.05 and the maximum critical temperature (Tc) ≈ 32 K has been obtained in samples with 0.1 ≤ x ≤ 0.2 from electronic resistivity measurement. A superconducting dome in the electronic phase diagram of Tc as a function of Fe content has been observed for the first time in this AxFeySe2 (A = K, Rb) superconducting system. Two coexisting phases with structural modulation vectors of q1 = 1/5[3a∗ + b∗] and q2 = 1/2[a∗ + b∗] have been observed in all superconducting samples by TEM observations. Moreover, phase separation in the superconducting crystals, which can be recognized as micro-stripes in the a-b plane, are found to be highly dependent on the Fe content.

KW - RbFeSe

KW - electronic phase diagram

KW - microstructure

KW - superconductor

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SN - 0953-2048

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JO - Superconductor Science and Technology

JF - Superconductor Science and Technology

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ER -

Superconducting dome and microstructure properties of Rb_0.8Fe_1.6+xSe₂ superconductors

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Keywords

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