Quantum Critical Point in the Itinerant Ferromagnet Ni1-xRhx

C. L. Huang; A. M. Hallas; K. Grube; S. Kuntz; B. Spieß; K. Bayliff; T. Besara; T. Siegrist; Y. Cai; J. Beare; G. M. Luke; E. Morosan

doi:10.1103/PhysRevLett.124.117203

Quantum Critical Point in the Itinerant Ferromagnet Ni1-xRhx

C. L. Huang, A. M. Hallas, K. Grube, S. Kuntz, B. Spieß, K. Bayliff, T. Besara, T. Siegrist, Y. Cai, J. Beare, G. M. Luke, E. Morosan

Department of Physics

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

1 Citation (Scopus)

Abstract

We report a chemical substitution-induced ferromagnetic quantum critical point in polycrystalline Ni1-xRhx alloys. Through magnetization and muon spin relaxation measurements, we show that the ferromagnetic ordering temperature is suppressed continuously to zero at xcrit=0.375 while the magnetic volume fraction remains 100% up to xcrit, pointing to a second order transition. Non-Fermi liquid behavior is observed close to xcrit, where the electronic specific heat Cel/T diverges logarithmically, while immediately above xcrit the volume thermal expansion coefficient αV/T and the Grüneisen ratio Γ=αV/Cel both diverge logarithmically in the low temperature limit, further indication of a ferromagnetic quantum critical point in Ni1-xRhx.

Original language	English
Article number	117203
Journal	Physical review letters
Volume	124
Issue number	11
DOIs	https://doi.org/10.1103/PhysRevLett.124.117203
Publication status	Published - 2020 Mar 20

All Science Journal Classification (ASJC) codes

Physics and Astronomy(all)

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10.1103/PhysRevLett.124.117203

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title = "Quantum Critical Point in the Itinerant Ferromagnet Ni1-xRhx",

abstract = "We report a chemical substitution-induced ferromagnetic quantum critical point in polycrystalline Ni1-xRhx alloys. Through magnetization and muon spin relaxation measurements, we show that the ferromagnetic ordering temperature is suppressed continuously to zero at xcrit=0.375 while the magnetic volume fraction remains 100% up to xcrit, pointing to a second order transition. Non-Fermi liquid behavior is observed close to xcrit, where the electronic specific heat Cel/T diverges logarithmically, while immediately above xcrit the volume thermal expansion coefficient αV/T and the Gr{\"u}neisen ratio Γ=αV/Cel both diverge logarithmically in the low temperature limit, further indication of a ferromagnetic quantum critical point in Ni1-xRhx.",

author = "Huang, {C. L.} and Hallas, {A. M.} and K. Grube and S. Kuntz and B. Spie{\ss} and K. Bayliff and T. Besara and T. Siegrist and Y. Cai and J. Beare and Luke, {G. M.} and E. Morosan",

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T1 - Quantum Critical Point in the Itinerant Ferromagnet Ni1-xRhx

AU - Huang, C. L.

AU - Hallas, A. M.

AU - Grube, K.

AU - Kuntz, S.

AU - Spieß, B.

AU - Bayliff, K.

AU - Besara, T.

AU - Siegrist, T.

AU - Cai, Y.

AU - Beare, J.

AU - Luke, G. M.

AU - Morosan, E.

PY - 2020/3/20

Y1 - 2020/3/20

N2 - We report a chemical substitution-induced ferromagnetic quantum critical point in polycrystalline Ni1-xRhx alloys. Through magnetization and muon spin relaxation measurements, we show that the ferromagnetic ordering temperature is suppressed continuously to zero at xcrit=0.375 while the magnetic volume fraction remains 100% up to xcrit, pointing to a second order transition. Non-Fermi liquid behavior is observed close to xcrit, where the electronic specific heat Cel/T diverges logarithmically, while immediately above xcrit the volume thermal expansion coefficient αV/T and the Grüneisen ratio Γ=αV/Cel both diverge logarithmically in the low temperature limit, further indication of a ferromagnetic quantum critical point in Ni1-xRhx.

AB - We report a chemical substitution-induced ferromagnetic quantum critical point in polycrystalline Ni1-xRhx alloys. Through magnetization and muon spin relaxation measurements, we show that the ferromagnetic ordering temperature is suppressed continuously to zero at xcrit=0.375 while the magnetic volume fraction remains 100% up to xcrit, pointing to a second order transition. Non-Fermi liquid behavior is observed close to xcrit, where the electronic specific heat Cel/T diverges logarithmically, while immediately above xcrit the volume thermal expansion coefficient αV/T and the Grüneisen ratio Γ=αV/Cel both diverge logarithmically in the low temperature limit, further indication of a ferromagnetic quantum critical point in Ni1-xRhx.

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