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

journal article·2024-07-16Open access

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

Chemistry of Materials

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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 Cr 4 Ge 7 . Our analysis on the powder neutron diffraction data revises the crystal structure as a noncentrosymmetric space group ( P 4̅ c 2, 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.

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Research context

OpenAlex topics: Advanced Condensed Matter Physics · Magnetic and transport properties of perovskites and related materials · Magnetic properties of thin films

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China

Center for Advanced Quantum Studies and Department of Physics, Beijing Normal University, Beijing 100875, China

Key Laboratory of Magnetic Materials and Devices & Zhejiang Province Key Laboratory of Magnetic Materials and Application Technology, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China

ShanghaiTech Laboratory for Topological Physics, ShanghaiTech University, Shanghai 201210, China

School of Physics, Harbin Institute of Technology, Harbin 150080, China

Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China

Analytical Instrumentation Center, School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China

Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States

Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institut, Villigen CH-5232, Switzerland

School of Physics and Electronics, Hunan University, Changsha 410082, China

Institute of Physics, Ecole Polytechnique Federale de Lausanne (EPFL), Lausanne CH-1015, Switzerland

A*STAR Quantum Innovation Centre (Q.InC), Institute of Materials Research and Engineering (IMRE), Agency for Science Technology and Research (A*STAR), 2 Fusionopolis Way, 138634 Singapore

Funding

National Key Research and Development Program of China · Office of Science · Science and Technology Commission of Shanghai Municipality · Fundamental Research Funds for the Central Universities · ShanghaiTech University · National Natural Science Foundation of China · Science and Technology Innovation Plan Of Shanghai Science and Technology Commission · Beijing National Laboratory for Condensed Matter Physics · State Key Laboratory of Functional Materials for Informatics · State Key Laboratory of Surface Physics, Fudan University

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