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Lai Y, Chan JY, Baumbach RE. Electronic landscape of the f-electron intermetallics with the ThCr 2Si 2 structure. SCIENCE ADVANCES 2022; 8:eabp8264. [PMID: 35947661 PMCID: PMC9365280 DOI: 10.1126/sciadv.abp8264] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/01/2022] [Accepted: 06/27/2022] [Indexed: 06/15/2023]
Abstract
Although strongly correlated f-electron systems are well known as reservoirs for quantum phenomena, a persistent challenge is to design specific states. What is often missing are simple ways to determine whether a given compound can be expected to exhibit certain behaviors and what tuning vector(s) would be useful to select the ground state. In this review, we address this question by aggregating information about Ce, Eu, Yb, and U compounds with the ThCr2Si2 structure. We construct electronic/magnetic state maps that are parameterized in terms of unit cell volumes and d-shell filling, which reveals useful trends including that (i) the magnetic and nonmagnetic examples are well separated, and (ii) the crossover regions harbor the examples with exotic states. These insights are used to propose structural/chemical regions of interest in these and related materials, with the goal of accelerating discovery of the next generation of f-electron quantum materials.
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Affiliation(s)
- You Lai
- National High Magnetic Field Laboratory, Florida State University, Tallahassee, FL 32310, USA
- Department of Physics, Florida State University, Tallahassee, FL 32306, USA
| | | | - Ryan E. Baumbach
- National High Magnetic Field Laboratory, Florida State University, Tallahassee, FL 32310, USA
- Department of Physics, Florida State University, Tallahassee, FL 32306, USA
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Montfrooij W, Heitmann T, Qiu Y, Watson S, Erwin R, Chen W, Zhao Y, Aronson M, Huang Y, de Visser A. Quantum critical behavior in Ce(Fe 0.76Ru 0.24) 2Ge 2. PHYSICAL REVIEW. B 2019; 99:10.1103/PhysRevB.99.195113. [PMID: 38712021 PMCID: PMC11071051 DOI: 10.1103/physrevb.99.195113] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2024]
Abstract
Systems with embedded magnetic ions that exhibit a competition between magnetic order and disorder down to absolute zero can display unusual low-temperature behaviors of the resistivity, susceptibility, and specific heat. Moreover, the dynamic response of such a system can display hyperscaling behavior in which the relaxation back to equilibrium when an amount of energy E is given to the system at temperature T only depends on the ratio E / T . Ce(Fe0.755Ru0.245)2Ge2 is a system that displays these behaviors. We show that these complex behaviors are rooted in a fragmentation of the magnetic lattice upon cooling caused by a distribution of local Kondo screening temperatures, and that the hyperscaling behavior can be attributed to the flipping of the total magnetic moment of magnetic clusters that spontaneously form and order upon cooling. We present our arguments based on the review of two-decades worth of neutron scattering and transport data on this system, augmented with new polarized and unpolarized neutron scattering experiments.
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Affiliation(s)
- Wouter Montfrooij
- Department of Physics and Astronomy, University of Missouri, Columbia, Missouri 65211, USA
- Missouri Research Reactor, University of Missouri, Columbia, Missouri 65211, USA
| | - Tom Heitmann
- Missouri Research Reactor, University of Missouri, Columbia, Missouri 65211, USA
| | - Yiming Qiu
- National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA
| | - Shannon Watson
- National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA
| | - Ross Erwin
- National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA
| | - Wangchun Chen
- National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA
| | - Yang Zhao
- National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA
- Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742, USA
| | - Meigan Aronson
- Stewart Blusson Quantum Matter Institute, University of British Columbia, Vancouver, BC, V6T 1Z4, Canada
| | - Yingkai Huang
- Van der Waals-Zeeman Institute, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands
| | - Anne de Visser
- Van der Waals-Zeeman Institute, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands
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Mumbaraddi D, Sarkar S, Peter SC. A review on the synthesis, crystal growth, structure and physical properties of rare earth based quaternary intermetallic compounds. J SOLID STATE CHEM 2016. [DOI: 10.1016/j.jssc.2015.10.032] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Montfrooij W, Aronson MC, Rainford BD, Mydosh JA, Murani AP, Haen P, Fukuhara T. Extended versus local fluctuations in quantum critical Ce(Ru1-xFex)2Ge2 (x=xc=0.76). PHYSICAL REVIEW LETTERS 2003; 91:087202. [PMID: 14525271 DOI: 10.1103/physrevlett.91.087202] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/19/2002] [Indexed: 05/24/2023]
Abstract
We present inelastic neutron scattering experiments, performed near the antiferromagnetic quantum critical point in Ce(Ru0.24Fe0.76)2Ge2. Both local and long-range fluctuations of the local moments are observed, but due to the Kondo effect only the latter are critical. We propose a phenomenological expression which fits the energy E, temperature T, and wave vector q dependences of the dynamic susceptibility, describing the non-Fermi liquid E/T scaling found at every q.
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Affiliation(s)
- W Montfrooij
- University of Michigan, Ann Arbor, MI 48109, USA
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