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Title: Quantum critical behaviour in the (Cr97.8Si2.2)(100-y)Moy alloy system
Authors: Sheppard, CJ
Prinsloo, ARE
Fernando, PR
Venter, AM
Strydom, AM
Peterson, VK
Keywords: Neutron diffraction
Issue Date: 7-May-2013
Publisher: American Institute of Physics
Citation: Sheppard, C. J., Prinsloo, A. R. E., Fernando, P. R., Venter, A. M., Strydom, A. M., & Peterson, V. K. (2013). Quantum critical behaviour in the (Cr97.8Si2.2)(100-y)Moy alloy system. Journal of Applied Physics, 113 (17), 17E7146. doi:10.1063/1.4798614
Abstract: The Cr-Si system offers an ideal reference alloy as a case study to follow the evolution of the well-known first-order magnetic transition in dilute Cr-Si by doping with Mo, which is iso-electronic with Cr. This alloy system, in addition, then also offers the opportunity to search for effects of quantum criticality (QC) associated with the process of driving the Neel transition temperature (T-N) to zero. Previous investigations on the ternary (Cr97.8Si2.2)(100-y)Mo-y alloy system (0 <= y <= 9) indicated possible quantum critical behaviour at a critical concentration y(c) approximate to 3.8. The present paper extends these studies to additional concentrations in the alloy series, as well as to explore key indicators of QC, such as Hall coefficient (R-H) and magnetic susceptibility (chi) measurements. Recent results indicate the possible existence of two critical points in the (Cr97.8Si2.2)(100-y)Mo-y alloy system. The first critical point at y(c1) is postulated to be related to the concentration where the first-order transition gives way to a second-order-like continuous magnetic phase transition. Behaviour normally associated with QC is observed at the second critical concentration y(c2), accompanying a transition to paramagnetism. © 2013 American Institute of Physics.
Gov't Doc #: 5087
ISSN: 0021-8979
Appears in Collections:Journal Articles

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