Quantum Critical Behavior in the Asymptotic Limit of High Disorder in the Medium Entropy Alloy NiCoCr0.8

Published

June 29, 2017

Author(s)

Brian C. Sales, Ke Jin, Hongbin Bei, John Nichols, Matthew F. Chisholm, F. May, Nicholas Butch, Andrew D. Christianson, Michael A. McGuire

Abstract

Concentrated solid solutions of transition metal atoms, such as NiCoCr, have extreme chemical disorder within a simple face-centered-cubic crystal structure. These alloys can be grown as large single crystals, and are closely related to the recently discovered high-entropy alloys. For NiCoCr_x alloys with x near 0.8, the critical exponents associated with a ferromagnetic quantum critical point (FQCP) are experimentally determined from magnetization and heat capacity measurements. For the first time all of the five exponents (γ_T approximately equal}1/2, β_Tapproximately equal}1, δapproximately equal}3/2, VZ_m approximately equal} 2, α T approximately equal} 0] are in remarkable agreement with predictions of Belitz-Kirkpatrick-Vojta [BKV] theory in the asymptotic limit of high disorder. Entropy stabilized concentrated solid solutions thus represent a unique platform to study quantum critical behavior in a highly class of materials.

Citation

Nature Partner Journals Quantum Materials

Volume

2

Issue

1

Pub Type

Journals

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Keywords

quantum criticality, ferromagnetism

Citation

Sales, B. , Jin, K. , Bei, H. , Nichols, J. , Chisholm, M. , May, F. , Butch, N. , Christianson, A. and McGuire, M. (2017), Quantum Critical Behavior in the Asymptotic Limit of High Disorder in the Medium Entropy Alloy NiCoCr_0.8, Nature Partner Journals Quantum Materials, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=923002 (Accessed April 19, 2024)