Quantum critical behavior in the asymptotic limit of high disorder in the medium entropy alloy NiCoCr0.8

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

doi:10.1038/s41535-017-0042-7

Title: Quantum critical behavior in the asymptotic limit of high disorder in the medium entropy alloy NiCoCr_0.8

Journal Article · Thu Jun 29 00:00:00 EDT 2017 · npj Quantum Materials

DOI:https://doi.org/10.1038/s41535-017-0042-7· OSTI ID:1502611

^[1];

^[1]; Butch, Nicholas P. ^[2]; Christianson, Andrew D. ^[1];

^[1]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States); Univ. of Maryland, College Park, MD (United States)

The behavior of matter near a quantum critical point is one of the most exciting and challenging areas of physics research. Emergent phenomena such as high-temperature superconductivity are linked to the proximity to a quantum critical point. Although significant progress has been made in understanding quantum critical behavior in some low dimensional magnetic insulators, the situation in metallic systems is much less clear. Here, we demonstrate that NiCoCr_x single crystal alloys are remarkable model systems for investigating quantum critical point physics in a metallic environment. For NiCoCr_x alloys with x ≈ 0.8, the critical exponents associated with a ferromagnetic quantum critical point are experimentally determined from low temperature magnetization and heat capacity measurements. All of the five exponents (γ _T ≈ 1/2, β _T ≈ 1, δ ≈ 3/2, νz_m ≈ 2, α¯ _T ≈ 0) are in remarkable agreement with predictions of Belitz–Kirkpatrick–Vojta theory in the asymptotic limit of high disorder. Using these critical exponents, excellent scaling of the magnetization data is demonstrated with no adjustable parameters. We also find a divergence of the magnetic Gruneisen parameter, consistent with a ferromagnetic quantum critical point. This work furthermore demonstrates that entropy stabilized concentrated solid solutions represent a unique platform to study quantum critical behavior in a highly tunable class of materials.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Energy Frontier Research Centers (EFRC) (United States). Energy Dissipation to Defect Evolution (EDDE)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1502611

Journal Information:: npj Quantum Materials, Vol. 2, Issue 1; ISSN 2397-4648

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 17 works

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