Paramagnetic to ferromagnetic phase transition in lightly Fe-doped Cr${}_2$B

Abstract

Cr${}_2$B displays temperature independent paramagnetism. We induce ferromagnetism by replacing less than $3\%$ of the Cr atoms by Fe. By the lowest Fe doping level made, Curie-Weiss behavior is observed; ${\Theta }_{CW}$ changes from $-20$K for $0.5\%$ Fe-doped Cr${}_2$B to positive values of about 50 K by $5\%$ Fe doping. The ferromagnetic T${}_C$ is 8 K for $2.5\%$ Fe doping and increases linearly to 46 K by $5\%$ doping; we infer that a quantum phase transition occurs near the $2.0\%$ Fe level. Magnetic fluctuations at the intermediate doping levels are reflected in the linear resistance and an anomalous heat capacity at low temperatures. Imaging and chemical analysis down to the atomic scale show that the Fe dopant is randomly distributed.

arXiv comment7 pages 8 figures

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Cited by in corpus (6)

• Weyl and Dirac Semimetals in Three Dimensional Solids
• Metallic Quantum Ferromagnets
• 3D Dirac semimetals: current materials, design principles and predictions of new materials
• Disorder dependence of the ferromagnetic quantum phase transition
• Study of the ferromagnetic quantum phase transition in Ce${}_{3-x}$Mg${}_x$Co${}_9$
• Evolution of magnetic fluctuations through the Fe-induced paramagnetic to ferromagnetic transition in Cr${}_2$B