Fe-vacancy order and superconductivity in tetragonal β-Fe1-xSe

Ta-Kun Chen; Chung-Chieh Chang; Hsian-Hong Chang; Ai-Hua Fang; Chih-Han Wang; Wei-Hsiang Chao; Chuan-Ming Tseng; Yung-Chi Lee; Yu-Ruei Wu; Min-Hsueh Wen; Hsin-Yu Tang; Fu-Rong Chen; Ming-Jye Wang; Maw-Kuen Wu; Dirk Van Dyck

doi:10.1073/pnas.1321160111

Fe-vacancy order and superconductivity in tetragonal β-Fe_1-xSe

Ta-Kun Chen^*, Chung-Chieh Chang, Hsian-Hong Chang, Ai-Hua Fang, Chih-Han Wang, Wei-Hsiang Chao, Chuan-Ming Tseng, Yung-Chi Lee, Yu-Ruei Wu, Min-Hsueh Wen, Hsin-Yu Tang, Fu-Rong Chen, Ming-Jye Wang, Maw-Kuen Wu^*, Dirk Van Dyck

^*Corresponding author for this work

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

75 Citations (Scopus)

Abstract

Several superconducting transition temperatures in the range of 30-46 K were reported in the recently discovered intercalated FeSe system (A_1-xFe_2-ySe₂, A = K, Rb, Cs, Tl). Although the superconducting phases were not yet conclusively decided, more than one magnetic phase with particular orders of iron vacancy and/or potassium vacancy were identified, and some were argued to be the parent phase. Here we show the discovery of the presence and ordering of iron vacancy in nonintercalated FeSe (PbO-type tetragonal β-Fe_1-xSe). Three types of iron-vacancy order were found through analytical electron microscopy, and one was identified to be nonsuperconducting and magnetic at low temperature. This discovery suggests that the rich-phases found in A_1-xFe_2-ySe₂ are not exclusive in Fe-Se and related superconductors. In addition, the magnetic β-Fe_1-xSe phases with particular iron-vacancy orders are more likely to be the parent phase of the FeSe superconducting system instead of the previously assigned β-Fe_1+δTe.

Original language	English
Pages (from-to)	63-68
Journal	PNAS: Proceedings of the National Academy of Sciences of the United States of America
Volume	111
Issue number	1
Online published	18 Dec 2013
DOIs	https://doi.org/10.1073/pnas.1321160111
Publication status	Published - 7 Jan 2014
Externally published	Yes

Research Keywords

magnetism
phase diagram

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Chen, T.-K., Chang, C.-C., Chang, H.-H., Fang, A.-H., Wang, C.-H., Chao, W.-H., Tseng, C.-M., Lee, Y.-C., Wu, Y.-R., Wen, M.-H., Tang, H.-Y., Chen, F.-R., Wang, M.-J., Wu, M.-K., & Van Dyck, D. (2014). Fe-vacancy order and superconductivity in tetragonal β-Fe_1-xSe. PNAS: Proceedings of the National Academy of Sciences of the United States of America, 111(1), 63-68. https://doi.org/10.1073/pnas.1321160111

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title = "Fe-vacancy order and superconductivity in tetragonal β-Fe1-xSe",

abstract = "Several superconducting transition temperatures in the range of 30-46 K were reported in the recently discovered intercalated FeSe system (A1-xFe2-ySe2, A = K, Rb, Cs, Tl). Although the superconducting phases were not yet conclusively decided, more than one magnetic phase with particular orders of iron vacancy and/or potassium vacancy were identified, and some were argued to be the parent phase. Here we show the discovery of the presence and ordering of iron vacancy in nonintercalated FeSe (PbO-type tetragonal β-Fe1-xSe). Three types of iron-vacancy order were found through analytical electron microscopy, and one was identified to be nonsuperconducting and magnetic at low temperature. This discovery suggests that the rich-phases found in A1-xFe2-ySe2 are not exclusive in Fe-Se and related superconductors. In addition, the magnetic β-Fe1-xSe phases with particular iron-vacancy orders are more likely to be the parent phase of the FeSe superconducting system instead of the previously assigned β-Fe1+δTe.",

keywords = "magnetism, phase diagram",

author = "Ta-Kun Chen and Chung-Chieh Chang and Hsian-Hong Chang and Ai-Hua Fang and Chih-Han Wang and Wei-Hsiang Chao and Chuan-Ming Tseng and Yung-Chi Lee and Yu-Ruei Wu and Min-Hsueh Wen and Hsin-Yu Tang and Fu-Rong Chen and Ming-Jye Wang and Maw-Kuen Wu and {Van Dyck}, Dirk",

year = "2014",

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doi = "10.1073/pnas.1321160111",

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Chen, T-K, Chang, C-C, Chang, H-H, Fang, A-H, Wang, C-H, Chao, W-H, Tseng, C-M, Lee, Y-C, Wu, Y-R, Wen, M-H, Tang, H-Y, Chen, F-R, Wang, M-J, Wu, M-K & Van Dyck, D 2014, 'Fe-vacancy order and superconductivity in tetragonal β-Fe_1-xSe', PNAS: Proceedings of the National Academy of Sciences of the United States of America, vol. 111, no. 1, pp. 63-68. https://doi.org/10.1073/pnas.1321160111

TY - JOUR

T1 - Fe-vacancy order and superconductivity in tetragonal β-Fe1-xSe

AU - Chen, Ta-Kun

AU - Chang, Chung-Chieh

AU - Chang, Hsian-Hong

AU - Fang, Ai-Hua

AU - Wang, Chih-Han

AU - Chao, Wei-Hsiang

AU - Tseng, Chuan-Ming

AU - Lee, Yung-Chi

AU - Wu, Yu-Ruei

AU - Wen, Min-Hsueh

AU - Tang, Hsin-Yu

AU - Chen, Fu-Rong

AU - Wang, Ming-Jye

AU - Wu, Maw-Kuen

AU - Van Dyck, Dirk

PY - 2014/1/7

Y1 - 2014/1/7

N2 - Several superconducting transition temperatures in the range of 30-46 K were reported in the recently discovered intercalated FeSe system (A1-xFe2-ySe2, A = K, Rb, Cs, Tl). Although the superconducting phases were not yet conclusively decided, more than one magnetic phase with particular orders of iron vacancy and/or potassium vacancy were identified, and some were argued to be the parent phase. Here we show the discovery of the presence and ordering of iron vacancy in nonintercalated FeSe (PbO-type tetragonal β-Fe1-xSe). Three types of iron-vacancy order were found through analytical electron microscopy, and one was identified to be nonsuperconducting and magnetic at low temperature. This discovery suggests that the rich-phases found in A1-xFe2-ySe2 are not exclusive in Fe-Se and related superconductors. In addition, the magnetic β-Fe1-xSe phases with particular iron-vacancy orders are more likely to be the parent phase of the FeSe superconducting system instead of the previously assigned β-Fe1+δTe.

AB - Several superconducting transition temperatures in the range of 30-46 K were reported in the recently discovered intercalated FeSe system (A1-xFe2-ySe2, A = K, Rb, Cs, Tl). Although the superconducting phases were not yet conclusively decided, more than one magnetic phase with particular orders of iron vacancy and/or potassium vacancy were identified, and some were argued to be the parent phase. Here we show the discovery of the presence and ordering of iron vacancy in nonintercalated FeSe (PbO-type tetragonal β-Fe1-xSe). Three types of iron-vacancy order were found through analytical electron microscopy, and one was identified to be nonsuperconducting and magnetic at low temperature. This discovery suggests that the rich-phases found in A1-xFe2-ySe2 are not exclusive in Fe-Se and related superconductors. In addition, the magnetic β-Fe1-xSe phases with particular iron-vacancy orders are more likely to be the parent phase of the FeSe superconducting system instead of the previously assigned β-Fe1+δTe.

KW - magnetism

KW - phase diagram

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U2 - 10.1073/pnas.1321160111

DO - 10.1073/pnas.1321160111

M3 - RGC 21 - Publication in refereed journal

C2 - 24351933

SN - 0027-8424

VL - 111

SP - 63

EP - 68

JO - PNAS: Proceedings of the National Academy of Sciences of the United States of America

JF - PNAS: Proceedings of the National Academy of Sciences of the United States of America

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