Quantum phase transition and ferromagnetism in C o1+xSn

Rabindra Pahari, Balamurugan Balasubramanian, Rohit Pathak, Manh Cuong Nguyen, Shah R. Valloppilly, Ralph Skomski, Arti Kashyap, Cai Zhuang Wang, Kai Ming Ho, George C. Hadjipanayis, David J. Sellmyer

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


The onset of ferromagnetism in cobalt-tin alloys is investigated experimentally and theoretically. The Co1+xSn alloys were prepared by rapid quenching from the melt and form a modified hexagonal NiAs-type crystal structure for 0.45≤x≤1. The magnetic behavior is described analytically and by density-functional theory using supercells and the coherent-potential approximation. The excess of Co concentration x, which enters the interstitial 2d sites in the hypothetical NiAs-ordered parent alloy CoSn, yields a Griffiths-like phase and, above a quantum critical point (xc≈0.65), a quantum phase transition to ferromagnetic order. Quantum critical exponents are determined on the paramagnetic and ferromagnetic sides of the transition and related to the nature of the magnetism in itinerant systems with different types of chemical disorder.

Original languageEnglish (US)
Article number184438
JournalPhysical Review B
Issue number18
StatePublished - May 28 2019

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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