Evidence for a possible quantum critical point in a Cr-Si alloy doped with Mo

C. J. Sheppard; A. R.E. Prinsloo; H. L. Alberts; A. M. Strydom

doi:10.1063/1.3536667

Evidence for a possible quantum critical point in a Cr-Si alloy doped with Mo

C. J. Sheppard, A. R.E. Prinsloo, H. L. Alberts, A. M. Strydom

Physics

University of Johannesburg

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

6 Citations (Scopus)

Abstract

The magnetic behavior and possibility of quantum criticality in a (Cr _0.98Si_0.02)_1-yMo_y alloy system (0≤y≤ 0.09) is investigated through electrical resistivity, specific heat, and thermoelectric power measurements in a temperature range 2-350 K. Alloys with 0≤y≤ 0.011 depict first-order Néel transitions that give way to continuous Néel transitions for 0.011 y 0.038. The Néel temperature, T_N(y), seems to be suppressed down to 0 K at a critical concentration y_c ≈ 0.04. The Sommerfeld coefficient of specific heat (y) peaks at y ≈ y_c, showing a sharp decreasing trend on decreasing y to below y_c. This behavior is reminiscent of that observed for of the prototypical Cr_1-xV_x quantum critical system, and indeed also portrays the physics of a quantum critical point in the present (Cr_0.98Si_0.02)_1-yMo_y system.

Original language	English
Article number	07E104
Journal	Journal of Applied Physics
Volume	109
Issue number	7
DOIs	https://doi.org/10.1063/1.3536667
Publication status	Published - 1 Apr 2011

ASJC Scopus subject areas

General Physics and Astronomy

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10.1063/1.3536667

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title = "Evidence for a possible quantum critical point in a Cr-Si alloy doped with Mo",

abstract = "The magnetic behavior and possibility of quantum criticality in a (Cr 0.98Si0.02)1-yMoy alloy system (0≤y≤ 0.09) is investigated through electrical resistivity, specific heat, and thermoelectric power measurements in a temperature range 2-350 K. Alloys with 0≤y≤ 0.011 depict first-order N{\'e}el transitions that give way to continuous N{\'e}el transitions for 0.011 y 0.038. The N{\'e}el temperature, TN(y), seems to be suppressed down to 0 K at a critical concentration yc ≈ 0.04. The Sommerfeld coefficient of specific heat (y) peaks at y ≈ yc, showing a sharp decreasing trend on decreasing y to below yc. This behavior is reminiscent of that observed for of the prototypical Cr1-xVx quantum critical system, and indeed also portrays the physics of a quantum critical point in the present (Cr0.98Si0.02)1-yMoy system.",

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AU - Sheppard, C. J.

AU - Prinsloo, A. R.E.

AU - Alberts, H. L.

AU - Strydom, A. M.

PY - 2011/4/1

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N2 - The magnetic behavior and possibility of quantum criticality in a (Cr 0.98Si0.02)1-yMoy alloy system (0≤y≤ 0.09) is investigated through electrical resistivity, specific heat, and thermoelectric power measurements in a temperature range 2-350 K. Alloys with 0≤y≤ 0.011 depict first-order Néel transitions that give way to continuous Néel transitions for 0.011 y 0.038. The Néel temperature, TN(y), seems to be suppressed down to 0 K at a critical concentration yc ≈ 0.04. The Sommerfeld coefficient of specific heat (y) peaks at y ≈ yc, showing a sharp decreasing trend on decreasing y to below yc. This behavior is reminiscent of that observed for of the prototypical Cr1-xVx quantum critical system, and indeed also portrays the physics of a quantum critical point in the present (Cr0.98Si0.02)1-yMoy system.

AB - The magnetic behavior and possibility of quantum criticality in a (Cr 0.98Si0.02)1-yMoy alloy system (0≤y≤ 0.09) is investigated through electrical resistivity, specific heat, and thermoelectric power measurements in a temperature range 2-350 K. Alloys with 0≤y≤ 0.011 depict first-order Néel transitions that give way to continuous Néel transitions for 0.011 y 0.038. The Néel temperature, TN(y), seems to be suppressed down to 0 K at a critical concentration yc ≈ 0.04. The Sommerfeld coefficient of specific heat (y) peaks at y ≈ yc, showing a sharp decreasing trend on decreasing y to below yc. This behavior is reminiscent of that observed for of the prototypical Cr1-xVx quantum critical system, and indeed also portrays the physics of a quantum critical point in the present (Cr0.98Si0.02)1-yMoy system.

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Evidence for a possible quantum critical point in a Cr-Si alloy doped with Mo

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