Quantum critical behavior in the asymptotic limit of high disorder in the medium entropy alloy NiCoCr0.8
Abstract
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 NiCoCrx single crystal alloys are remarkable model systems for investigating quantum critical point physics in a metallic environment. For NiCoCrx 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, νzm ≈ 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 tomore »
- Authors:
-
[1];
[1];
[1];
[1];
[1];
[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)
- Publication Date:
- Research Org.:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Energy Frontier Research Centers (EFRC) (United States). Energy Dissipation to Defect Evolution (EDDE)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1502611
- Grant/Contract Number:
- AC05-00OR22725
- Resource Type:
- Accepted Manuscript
- Journal Name:
- npj Quantum Materials
- Additional Journal Information:
- Journal Volume: 2; Journal Issue: 1; Journal ID: ISSN 2397-4648
- Publisher:
- Nature Publishing Group
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE
Citation Formats
Sales, Brian C., Jin, Ke, Bei, Hongbin, Nichols, John A., Chisholm, Matthew F., May, Andrew F., Butch, Nicholas P., Christianson, Andrew D., and McGuire, Michael A. Quantum critical behavior in the asymptotic limit of high disorder in the medium entropy alloy NiCoCr0.8. United States: N. p., 2017.
Web. doi:10.1038/s41535-017-0042-7.
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. Quantum critical behavior in the asymptotic limit of high disorder in the medium entropy alloy NiCoCr0.8. United States. https://doi.org/10.1038/s41535-017-0042-7
Sales, Brian C., Jin, Ke, Bei, Hongbin, Nichols, John A., Chisholm, Matthew F., May, Andrew F., Butch, Nicholas P., Christianson, Andrew D., and McGuire, Michael A. Thu .
"Quantum critical behavior in the asymptotic limit of high disorder in the medium entropy alloy NiCoCr0.8". United States. https://doi.org/10.1038/s41535-017-0042-7. https://www.osti.gov/servlets/purl/1502611.
@article{osti_1502611,
title = {Quantum critical behavior in the asymptotic limit of high disorder in the medium entropy alloy NiCoCr0.8},
author = {Sales, Brian C. and Jin, Ke and Bei, Hongbin and Nichols, John A. and Chisholm, Matthew F. and May, Andrew F. and Butch, Nicholas P. and Christianson, Andrew D. and McGuire, Michael A.},
abstractNote = {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 NiCoCrx single crystal alloys are remarkable model systems for investigating quantum critical point physics in a metallic environment. For NiCoCrx 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, νzm ≈ 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.},
doi = {10.1038/s41535-017-0042-7},
journal = {npj Quantum Materials},
number = 1,
volume = 2,
place = {United States},
year = {Thu Jun 29 00:00:00 EDT 2017},
month = {Thu Jun 29 00:00:00 EDT 2017}
}
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- Ran, Sheng; Eckberg, Chris; Ding, Qing-Ping
- Science, Vol. 365, Issue 6454