Paramagnetic to ferromagnetic phase transition in lightly Fe-doped Cr2 B

Leslie Schoop; Max Hirschberger; Jing Tao; Claudia Felser; N. P. Ong; R. J. Cava

doi:10.1103/PhysRevB.89.224417

Paramagnetic to ferromagnetic phase transition in lightly Fe-doped Cr2 B

Leslie Schoop, Max Hirschberger, Jing Tao, Claudia Felser, N. P. Ong, R. J. Cava

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

21 Scopus citations

Abstract

Cr2B 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; ΘCW changes from -20K for 0.5% Fe-doped Cr2B to positive values of about 50 K by 5% Fe doping. The ferromagnetic TC 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.

Original language	English (US)
Article number	224417
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	89
Issue number	22
DOIs	https://doi.org/10.1103/PhysRevB.89.224417
State	Published - Jun 26 2014

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1103/PhysRevB.89.224417

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title = "Paramagnetic to ferromagnetic phase transition in lightly Fe-doped Cr2 B",

abstract = "Cr2B 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; ΘCW changes from -20K for 0.5% Fe-doped Cr2B to positive values of about 50 K by 5% Fe doping. The ferromagnetic TC 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.",

author = "Leslie Schoop and Max Hirschberger and Jing Tao and Claudia Felser and Ong, {N. P.} and Cava, {R. J.}",

year = "2014",

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T1 - Paramagnetic to ferromagnetic phase transition in lightly Fe-doped Cr2 B

AU - Schoop, Leslie

AU - Hirschberger, Max

AU - Tao, Jing

AU - Felser, Claudia

AU - Ong, N. P.

AU - Cava, R. J.

PY - 2014/6/26

Y1 - 2014/6/26

N2 - Cr2B 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; ΘCW changes from -20K for 0.5% Fe-doped Cr2B to positive values of about 50 K by 5% Fe doping. The ferromagnetic TC 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.

AB - Cr2B 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; ΘCW changes from -20K for 0.5% Fe-doped Cr2B to positive values of about 50 K by 5% Fe doping. The ferromagnetic TC 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.

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Paramagnetic to ferromagnetic phase transition in lightly Fe-doped Cr2 B

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