Noncentrosymmetric Nowotny Chimney Ladder Ferromagnet Cr4Ge7 with a High Curie Temperature of 207 K
arxiv(2024)
摘要
Noncentrosymmetric magnets usually host intriguing magnetic interactions
inherent 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 (P-4c2,
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 miuB 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 at 18 K is assumed to arise from a competition between the
Dzyaloshinskii-Moria and Heisenberg interactions. The results provide an
excellent platform for study on intricate interactions between various magnetic
exchanges as well as for the exploration of high temperature exotic magnetic
properties which host potential applications in next-generation spintronics.
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