Effects of Jahn-Teller distortion on the skyrmion stability of (Cu1-xNix)2OSeO3

K. Devi Chandrasekhar; H. C. Wu; C. L. Huang; H. D. Yang

doi:10.1039/c6tc00878j

Effects of Jahn-Teller distortion on the skyrmion stability of (Cu_1-xNi_x)₂OSeO₃

K. Devi Chandrasekhar, H. C. Wu, C. L. Huang, H. D. Yang

Department of Physics

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

9 Citations (Scopus)

Abstract

We explore the Jahn-Teller distortion of Ni²⁺ ions on the skyrmion phase of Cu₂OSeO₃. Polycrystalline (Cu_1-xNi_x)₂OSeO₃ (0 ≤ x ≤ 0.06) samples were synthesized by solid-state reaction. X-ray diffraction, X-ray absorption near-edge spectroscopy, extended X-ray absorption fine structure spectroscopy, magnetic and magnetodielectric measurements were performed and comprehensively analyzed. These revealed that the Ni²⁺ ion occupies both the Cu sites almost equally, and the Jahn-Teller distortion of the Ni²⁺ ion invokes a change in the local trigonal bipyramidal structure, which has a significant influence on the H-T magnetic phase diagram and electrical polarization of (Cu_1-xNi_x)₂OSeO₃. A large enhancement of the skyrmion area upon Ni-doping can be ascribed to the magnetic anisotropy of the Jahn-Teller active Ni²⁺ ion in the Cu(i) site. The observed results indicate that chemical doping is a unique way to control and manipulate skyrmion boundaries in Cu₂OSeO₃.

Original language	English
Pages (from-to)	5270-5274
Number of pages	5
Journal	Journal of Materials Chemistry C
Volume	4
Issue number	23
DOIs	https://doi.org/10.1039/c6tc00878j
Publication status	Published - 2016

All Science Journal Classification (ASJC) codes

Chemistry(all)
Materials Chemistry

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title = "Effects of Jahn-Teller distortion on the skyrmion stability of (Cu1-xNix)2OSeO3",

abstract = "We explore the Jahn-Teller distortion of Ni2+ ions on the skyrmion phase of Cu2OSeO3. Polycrystalline (Cu1-xNix)2OSeO3 (0 ≤ x ≤ 0.06) samples were synthesized by solid-state reaction. X-ray diffraction, X-ray absorption near-edge spectroscopy, extended X-ray absorption fine structure spectroscopy, magnetic and magnetodielectric measurements were performed and comprehensively analyzed. These revealed that the Ni2+ ion occupies both the Cu sites almost equally, and the Jahn-Teller distortion of the Ni2+ ion invokes a change in the local trigonal bipyramidal structure, which has a significant influence on the H-T magnetic phase diagram and electrical polarization of (Cu1-xNix)2OSeO3. A large enhancement of the skyrmion area upon Ni-doping can be ascribed to the magnetic anisotropy of the Jahn-Teller active Ni2+ ion in the Cu(i) site. The observed results indicate that chemical doping is a unique way to control and manipulate skyrmion boundaries in Cu2OSeO3.",

author = "Chandrasekhar, {K. Devi} and Wu, {H. C.} and Huang, {C. L.} and Yang, {H. D.}",

note = "Funding Information: This work was supported by the Ministry of Science and Technology, Taiwan, under Grant No. MOST: 103-2112-M-110-010-MY3. Publisher Copyright: {\textcopyright} 2016 The Royal Society of Chemistry. Copyright: Copyright 2016 Elsevier B.V., All rights reserved.",

year = "2016",

doi = "10.1039/c6tc00878j",

language = "English",

volume = "4",

pages = "5270--5274",

journal = "Journal of Materials Chemistry C",

issn = "2050-7526",

publisher = "Royal Society of Chemistry",

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T1 - Effects of Jahn-Teller distortion on the skyrmion stability of (Cu1-xNix)2OSeO3

AU - Chandrasekhar, K. Devi

AU - Wu, H. C.

AU - Huang, C. L.

AU - Yang, H. D.

N1 - Funding Information: This work was supported by the Ministry of Science and Technology, Taiwan, under Grant No. MOST: 103-2112-M-110-010-MY3. Publisher Copyright: © 2016 The Royal Society of Chemistry. Copyright: Copyright 2016 Elsevier B.V., All rights reserved.

PY - 2016

Y1 - 2016

N2 - We explore the Jahn-Teller distortion of Ni2+ ions on the skyrmion phase of Cu2OSeO3. Polycrystalline (Cu1-xNix)2OSeO3 (0 ≤ x ≤ 0.06) samples were synthesized by solid-state reaction. X-ray diffraction, X-ray absorption near-edge spectroscopy, extended X-ray absorption fine structure spectroscopy, magnetic and magnetodielectric measurements were performed and comprehensively analyzed. These revealed that the Ni2+ ion occupies both the Cu sites almost equally, and the Jahn-Teller distortion of the Ni2+ ion invokes a change in the local trigonal bipyramidal structure, which has a significant influence on the H-T magnetic phase diagram and electrical polarization of (Cu1-xNix)2OSeO3. A large enhancement of the skyrmion area upon Ni-doping can be ascribed to the magnetic anisotropy of the Jahn-Teller active Ni2+ ion in the Cu(i) site. The observed results indicate that chemical doping is a unique way to control and manipulate skyrmion boundaries in Cu2OSeO3.

AB - We explore the Jahn-Teller distortion of Ni2+ ions on the skyrmion phase of Cu2OSeO3. Polycrystalline (Cu1-xNix)2OSeO3 (0 ≤ x ≤ 0.06) samples were synthesized by solid-state reaction. X-ray diffraction, X-ray absorption near-edge spectroscopy, extended X-ray absorption fine structure spectroscopy, magnetic and magnetodielectric measurements were performed and comprehensively analyzed. These revealed that the Ni2+ ion occupies both the Cu sites almost equally, and the Jahn-Teller distortion of the Ni2+ ion invokes a change in the local trigonal bipyramidal structure, which has a significant influence on the H-T magnetic phase diagram and electrical polarization of (Cu1-xNix)2OSeO3. A large enhancement of the skyrmion area upon Ni-doping can be ascribed to the magnetic anisotropy of the Jahn-Teller active Ni2+ ion in the Cu(i) site. The observed results indicate that chemical doping is a unique way to control and manipulate skyrmion boundaries in Cu2OSeO3.

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Effects of Jahn-Teller distortion on the skyrmion stability of (Cu_1-xNi_x)₂OSeO₃

Abstract

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