Complex itinerant ferromagnetism in noncentrosymmetric Cr11Ge19

Abstract

The noncentrosymmetric ferromagnet Cr11Ge19 has been investigated by electrical transport, AC and DC magnetization, heat capacity, x-ray diffraction, resonant ultrasound spectroscopy, and first principles electronic structure calculations. Complex itinerant ferromagnetism in this material is indicated by nonlinearity in conventional Arrott plots, unusual behavior of AC susceptibility, and a weak heat capacity anomaly near the Curie temperature (88 K). The inclusion of spin wave excitations was found to be important in modeling the low temperature heat capacity. The temperature dependence of the elastic moduli and lattice constants, including negative thermal expansion along the c axis at low temperatures, indicate strong magneto-elastic coupling in this system. Calculations show strong evidence for itinerant ferromagnetism and suggest a noncollinear ground state may be expected.

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Cited by in corpus (8)

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• Magnetic phase transitions in single crystals of the chiral helimagnet Cr1/3NbS2
• Surface twist instabilities and skyrmion states in chiral ferromagnets
• Ba{0.4}Rb{0.6}Mn2As2: A Prototype Half-Metallic Ferromagnet
• Topological Hall effect and the magnetic states of Nowotney chimney ladder compound Cr${}_{11}$Ge${}_{19}$}
• Magnetotransport properties in a noncentrosymmetric itinerant magnet Cr${}_{11}$Ge${}_{19}$
• Noncentrosymmetric Nowotny Chimney Ladder Ferromagnet Cr4Ge7 with a High Curie Temperature of ~ 207 K
• Structural modulation, physical properties, and electronic band structure of the kagome metal UCr${}_6$Ge${}_6$