Noncentrosymmetric Nowotny Chimney Ladder Ferromagnet Cr4Ge7 with a High Curie Temperature of ∼207 K

Zhenhai Yu; Kaijuan Zhou; Xiaofei Hou; Xuejiao Chen; Zhen Tao; Yunguan Ye; Wei Xia; Zhongyang Li; Jinggeng Zhao; Wei Wu; Ziyi Liu; Xia Wang; Na Yu; Jinguang Cheng; Jian Lin Luo; Qiang Zhang; Vladimir Y. Pomjakushin; Zhicheng Zhong; Shihao Zhang; Jian Rui Soh; Xingye Lu; Yanfeng Guo

doi:10.1021/acs.chemmater.4c00669

Noncentrosymmetric Nowotny Chimney Ladder Ferromagnet Cr₄Ge₇ with a High Curie Temperature of ∼207 K

Zhenhai Yu
, Kaijuan Zhou
, Xiaofei Hou
, Xuejiao Chen
, Zhen Tao
, Yunguan Ye
, Wei Xia
, Zhongyang Li
, Jinggeng Zhao
, Wei Wu
, Ziyi Liu
, Xia Wang
, Na Yu
, Jinguang Cheng
, Jian Lin Luo
, Qiang Zhang
, Vladimir Y. Pomjakushin
, Zhicheng Zhong
, Shihao Zhang
, Jian Rui Soh

Xingye Lu, Yanfeng Guo

Powder Diffraction

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

Abstract

Noncentrosymmetric magnets usually host intriguing magnetic interactions inherent in the crystal structure with broken inversion symmetry, which can give rise to rich magnetic behaviors. We report herein the high-pressure synthesis, crystal structure, magnetizations, and magnetic structure of a so-called Nowotny chimney ladder compound Cr₄Ge₇. Our analysis on the powder neutron diffraction data revises the crystal structure as a noncentrosymmetric space group (P4̅c2, No. 116). It exhibits two magnetic orders within the temperature range of 2-400 K. The first order at ∼207 K associated with a small magnetic moment of ∼0.75 μ_B is assigned to a commensurate ferromagnetic structure with a propagation vector k = (0, 0, 0). The weak itinerant ferromagnet nature should be caused by the complex Cr spin orders from different Wyckoff positions. The second order-like behavior at ∼18 K is assumed to arise from a competition between the Dzyaloshinskii-Moriya and Heisenberg interactions. The results provide an excellent platform for the study of intricate interactions among various magnetic exchanges as well as for the exploration of high-temperature exotic magnetic properties.

Original language	English
Journal	Chemistry of Materials
DOIs	https://doi.org/10.1021/acs.chemmater.4c00669
State	Accepted/In press - 2024

Funding

The authors acknowledge the Shanghai Science and Technology Innovation Action Plan (Grant No. 21JC1402000), the National Nature Science Foundation of China (Grants Nos. 920651, 11934017, 12304217, and 12025408), and the National Key R&D Program of China (Grants Nos. 2023YFA1406100, 2021YFA0718900, 2022YFA1403000, and 2021YFA1400400). Y.F.G. acknowledges the open projects from the State Key Laboratory of Functional Materials for Informatics (Grant No. SKL2022), CAS, and Beijing National Laboratory for Condensed Matter Physics (Grant No. 2023BNLCMPKF002). W.X. thanks the open project from the State Key Laboratory of Surface Physics and Department of Physics, Fudan University (Grant No. KF2022_13), and the Shanghai Sailing Program (23YF1426900) for support. Part of this research used the Spallation Neutron Source, DOE Office of Science User Facilities operated by the Oak Ridge National Laboratory. The authors also thank the Analytical Instrumentation Center (#SPST-AIC10112914) and the Double First-Class Initiative Fund of ShanghaiTech University for support. S.Z. was supported by the Fundamental Research Funds for the Central Universities from China.

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10.1021/acs.chemmater.4c00669

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Yu, Z., Zhou, K., Hou, X., Chen, X., Tao, Z., Ye, Y., Xia, W., Li, Z., Zhao, J., Wu, W., Liu, Z., Wang, X., Yu, N., Cheng, J., Luo, J. L., Zhang, Q., Pomjakushin, V. Y., Zhong, Z., Zhang, S., ... Guo, Y. (Accepted/In press). Noncentrosymmetric Nowotny Chimney Ladder Ferromagnet Cr₄Ge₇ with a High Curie Temperature of ∼207 K. Chemistry of Materials. https://doi.org/10.1021/acs.chemmater.4c00669

@article{26213eb754ec4b0591350eaa343ee259,

title = "Noncentrosymmetric Nowotny Chimney Ladder Ferromagnet Cr4Ge7 with a High Curie Temperature of ∼207 K",

abstract = "Noncentrosymmetric magnets usually host intriguing magnetic interactions inherent in the crystal structure with broken inversion symmetry, which can give rise to rich magnetic behaviors. We report herein the high-pressure synthesis, crystal structure, magnetizations, and magnetic structure of a so-called Nowotny chimney ladder compound Cr4Ge7. Our analysis on the powder neutron diffraction data revises the crystal structure as a noncentrosymmetric space group (P4̅c2, No. 116). It exhibits two magnetic orders within the temperature range of 2-400 K. The first order at ∼207 K associated with a small magnetic moment of ∼0.75 μB is assigned to a commensurate ferromagnetic structure with a propagation vector k = (0, 0, 0). The weak itinerant ferromagnet nature should be caused by the complex Cr spin orders from different Wyckoff positions. The second order-like behavior at ∼18 K is assumed to arise from a competition between the Dzyaloshinskii-Moriya and Heisenberg interactions. The results provide an excellent platform for the study of intricate interactions among various magnetic exchanges as well as for the exploration of high-temperature exotic magnetic properties.",

author = "Zhenhai Yu and Kaijuan Zhou and Xiaofei Hou and Xuejiao Chen and Zhen Tao and Yunguan Ye and Wei Xia and Zhongyang Li and Jinggeng Zhao and Wei Wu and Ziyi Liu and Xia Wang and Na Yu and Jinguang Cheng and Luo, \{Jian Lin\} and Qiang Zhang and Pomjakushin, \{Vladimir Y.\} and Zhicheng Zhong and Shihao Zhang and Soh, \{Jian Rui\} and Xingye Lu and Yanfeng Guo",

note = "Publisher Copyright: {\textcopyright} 2024 American Chemical Society.",

year = "2024",

doi = "10.1021/acs.chemmater.4c00669",

language = "English",

journal = "Chemistry of Materials",

issn = "0897-4756",

publisher = "American Chemical Society",

}

Yu, Z, Zhou, K, Hou, X, Chen, X, Tao, Z, Ye, Y, Xia, W, Li, Z, Zhao, J, Wu, W, Liu, Z, Wang, X, Yu, N, Cheng, J, Luo, JL, Zhang, Q, Pomjakushin, VY, Zhong, Z, Zhang, S, Soh, JR, Lu, X & Guo, Y 2024, 'Noncentrosymmetric Nowotny Chimney Ladder Ferromagnet Cr₄Ge₇ with a High Curie Temperature of ∼207 K', Chemistry of Materials. https://doi.org/10.1021/acs.chemmater.4c00669

TY - JOUR

T1 - Noncentrosymmetric Nowotny Chimney Ladder Ferromagnet Cr4Ge7 with a High Curie Temperature of ∼207 K

AU - Yu, Zhenhai

AU - Zhou, Kaijuan

AU - Hou, Xiaofei

AU - Chen, Xuejiao

AU - Tao, Zhen

AU - Ye, Yunguan

AU - Xia, Wei

AU - Li, Zhongyang

AU - Zhao, Jinggeng

AU - Wu, Wei

AU - Liu, Ziyi

AU - Wang, Xia

AU - Yu, Na

AU - Cheng, Jinguang

AU - Luo, Jian Lin

AU - Zhang, Qiang

AU - Pomjakushin, Vladimir Y.

AU - Zhong, Zhicheng

AU - Zhang, Shihao

AU - Soh, Jian Rui

AU - Lu, Xingye

AU - Guo, Yanfeng

PY - 2024

Y1 - 2024

N2 - Noncentrosymmetric magnets usually host intriguing magnetic interactions inherent in the crystal structure with broken inversion symmetry, which can give rise to rich magnetic behaviors. We report herein the high-pressure synthesis, crystal structure, magnetizations, and magnetic structure of a so-called Nowotny chimney ladder compound Cr4Ge7. Our analysis on the powder neutron diffraction data revises the crystal structure as a noncentrosymmetric space group (P4̅c2, No. 116). It exhibits two magnetic orders within the temperature range of 2-400 K. The first order at ∼207 K associated with a small magnetic moment of ∼0.75 μB is assigned to a commensurate ferromagnetic structure with a propagation vector k = (0, 0, 0). The weak itinerant ferromagnet nature should be caused by the complex Cr spin orders from different Wyckoff positions. The second order-like behavior at ∼18 K is assumed to arise from a competition between the Dzyaloshinskii-Moriya and Heisenberg interactions. The results provide an excellent platform for the study of intricate interactions among various magnetic exchanges as well as for the exploration of high-temperature exotic magnetic properties.

AB - Noncentrosymmetric magnets usually host intriguing magnetic interactions inherent in the crystal structure with broken inversion symmetry, which can give rise to rich magnetic behaviors. We report herein the high-pressure synthesis, crystal structure, magnetizations, and magnetic structure of a so-called Nowotny chimney ladder compound Cr4Ge7. Our analysis on the powder neutron diffraction data revises the crystal structure as a noncentrosymmetric space group (P4̅c2, No. 116). It exhibits two magnetic orders within the temperature range of 2-400 K. The first order at ∼207 K associated with a small magnetic moment of ∼0.75 μB is assigned to a commensurate ferromagnetic structure with a propagation vector k = (0, 0, 0). The weak itinerant ferromagnet nature should be caused by the complex Cr spin orders from different Wyckoff positions. The second order-like behavior at ∼18 K is assumed to arise from a competition between the Dzyaloshinskii-Moriya and Heisenberg interactions. The results provide an excellent platform for the study of intricate interactions among various magnetic exchanges as well as for the exploration of high-temperature exotic magnetic properties.

UR - https://www.scopus.com/pages/publications/85199067920

U2 - 10.1021/acs.chemmater.4c00669

DO - 10.1021/acs.chemmater.4c00669

M3 - Article

AN - SCOPUS:85199067920

SN - 0897-4756

JO - Chemistry of Materials

JF - Chemistry of Materials

ER -

Noncentrosymmetric Nowotny Chimney Ladder Ferromagnet Cr₄Ge₇ with a High Curie Temperature of ∼207 K

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