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 journalArticle

1 Citation (Scopus)

Abstract

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
Volume99
Issue number18
DOIs
StatePublished - May 28 2019

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Ferromagnetism
ferromagnetism
Phase transitions
tin alloys
Tin alloys
cobalt alloys
Rapid quenching
Cobalt alloys
Magnetism
Density functional theory
critical point
interstitials
Crystal structure
exponents
disorders
density functional theory
crystal structure
approximation

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Pahari, R., Balasubramanian, B., Pathak, R., Nguyen, M. C., Valloppilly, S. R., Skomski, R., ... Sellmyer, D. J. (2019). Quantum phase transition and ferromagnetism in C o1+xSn. Physical Review B, 99(18), [184438]. https://doi.org/10.1103/PhysRevB.99.184438

Quantum phase transition and ferromagnetism in C o1+xSn. / Pahari, Rabindra; Balasubramanian, Balamurugan; Pathak, Rohit; Nguyen, Manh Cuong; Valloppilly, Shah R.; Skomski, Ralph; Kashyap, Arti; Wang, Cai Zhuang; Ho, Kai Ming; Hadjipanayis, George C.; Sellmyer, David J.

In: Physical Review B, Vol. 99, No. 18, 184438, 28.05.2019.

Research output: Contribution to journalArticle

Pahari, R, Balasubramanian, B, Pathak, R, Nguyen, MC, Valloppilly, SR, Skomski, R, Kashyap, A, Wang, CZ, Ho, KM, Hadjipanayis, GC & Sellmyer, DJ 2019, 'Quantum phase transition and ferromagnetism in C o1+xSn', Physical Review B, vol. 99, no. 18, 184438. https://doi.org/10.1103/PhysRevB.99.184438
Pahari R, Balasubramanian B, Pathak R, Nguyen MC, Valloppilly SR, Skomski R et al. Quantum phase transition and ferromagnetism in C o1+xSn. Physical Review B. 2019 May 28;99(18). 184438. https://doi.org/10.1103/PhysRevB.99.184438
Pahari, Rabindra ; Balasubramanian, Balamurugan ; Pathak, Rohit ; Nguyen, Manh Cuong ; Valloppilly, Shah R. ; Skomski, Ralph ; Kashyap, Arti ; Wang, Cai Zhuang ; Ho, Kai Ming ; Hadjipanayis, George C. ; Sellmyer, David J. / Quantum phase transition and ferromagnetism in C o1+xSn. In: Physical Review B. 2019 ; Vol. 99, No. 18.
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