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 journalArticle

13 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 languageEnglish (US)
Article number224417
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume89
Issue number22
DOIs
StatePublished - Jun 26 2014

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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