Putative quantum criticality in the (Cr90Ir10) 100-yVy alloy system

P. R. Fernando; A. R.E. Prinsloo; C. J. Sheppard; L. Lodya

doi:10.1063/1.4863162

Putative quantum criticality in the (Cr₉₀Ir₁₀) _100-yV_y alloy system

P. R. Fernando, A. R.E. Prinsloo, C. J. Sheppard, L. Lodya

Physics

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

1 Citation (Scopus)

Abstract

Quantum criticality (QC) in spin-density-wave antiferromagnetic Cr and Cr alloy systems is a topic of current interest. In the present study, V was used as a tuning parameter to drive the Néel transition temperature (T _N) of the (Cr₉₀Ir₁₀)_100- _yV_y alloy series with 0 ≤y ≤14.3 to zero and search for effects of QC in the process. The magnetic properties and possible QC behaviour (QCB) in this alloy system were investigated through electrical resistivity (ρ), specific heat (C_p), and susceptibility (χ) measurements as a function of temperature (T), indicating that T_N is suppressed to zero at a critical concentration y_c ≈9. The Sommerfeld coefficient (γ) is considered a key indicator of QCB and a peak is observed in γ(y) at y_c on decreasing y through this concentration, followed by a sharp decreasing trend. This behaviour is reminiscent of that observed for γ of the prototypical Cr _100-xV_x QC system and allows for the classification of y_c in the (Cr₉₀Ir₁₀) _100-yV_y alloy system as a possible QC point.

Original language	English
Article number	17E120
Journal	Journal of Applied Physics
Volume	115
Issue number	17
DOIs	https://doi.org/10.1063/1.4863162
Publication status	Published - 7 May 2014

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General Physics and Astronomy

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title = "Putative quantum criticality in the (Cr90Ir10) 100-yVy alloy system",

abstract = "Quantum criticality (QC) in spin-density-wave antiferromagnetic Cr and Cr alloy systems is a topic of current interest. In the present study, V was used as a tuning parameter to drive the N{\'e}el transition temperature (T N) of the (Cr90Ir10)100- yVy alloy series with 0 ≤y ≤14.3 to zero and search for effects of QC in the process. The magnetic properties and possible QC behaviour (QCB) in this alloy system were investigated through electrical resistivity (ρ), specific heat (Cp), and susceptibility (χ) measurements as a function of temperature (T), indicating that TN is suppressed to zero at a critical concentration yc ≈9. The Sommerfeld coefficient (γ) is considered a key indicator of QCB and a peak is observed in γ(y) at yc on decreasing y through this concentration, followed by a sharp decreasing trend. This behaviour is reminiscent of that observed for γ of the prototypical Cr 100-xVx QC system and allows for the classification of yc in the (Cr90Ir10) 100-yVy alloy system as a possible QC point.",

author = "Fernando, {P. R.} and Prinsloo, {A. R.E.} and Sheppard, {C. J.} and L. Lodya",

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AU - Sheppard, C. J.

AU - Lodya, L.

PY - 2014/5/7

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N2 - Quantum criticality (QC) in spin-density-wave antiferromagnetic Cr and Cr alloy systems is a topic of current interest. In the present study, V was used as a tuning parameter to drive the Néel transition temperature (T N) of the (Cr90Ir10)100- yVy alloy series with 0 ≤y ≤14.3 to zero and search for effects of QC in the process. The magnetic properties and possible QC behaviour (QCB) in this alloy system were investigated through electrical resistivity (ρ), specific heat (Cp), and susceptibility (χ) measurements as a function of temperature (T), indicating that TN is suppressed to zero at a critical concentration yc ≈9. The Sommerfeld coefficient (γ) is considered a key indicator of QCB and a peak is observed in γ(y) at yc on decreasing y through this concentration, followed by a sharp decreasing trend. This behaviour is reminiscent of that observed for γ of the prototypical Cr 100-xVx QC system and allows for the classification of yc in the (Cr90Ir10) 100-yVy alloy system as a possible QC point.

AB - Quantum criticality (QC) in spin-density-wave antiferromagnetic Cr and Cr alloy systems is a topic of current interest. In the present study, V was used as a tuning parameter to drive the Néel transition temperature (T N) of the (Cr90Ir10)100- yVy alloy series with 0 ≤y ≤14.3 to zero and search for effects of QC in the process. The magnetic properties and possible QC behaviour (QCB) in this alloy system were investigated through electrical resistivity (ρ), specific heat (Cp), and susceptibility (χ) measurements as a function of temperature (T), indicating that TN is suppressed to zero at a critical concentration yc ≈9. The Sommerfeld coefficient (γ) is considered a key indicator of QCB and a peak is observed in γ(y) at yc on decreasing y through this concentration, followed by a sharp decreasing trend. This behaviour is reminiscent of that observed for γ of the prototypical Cr 100-xVx QC system and allows for the classification of yc in the (Cr90Ir10) 100-yVy alloy system as a possible QC point.

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Putative quantum criticality in the (Cr₉₀Ir₁₀) _100-yV_y alloy system

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