Plutonium and quantum criticality

Chapline, George; Fluss, M. J.; McCall, S.

doi:10.1016/j.jallcom.2006.10.165

Cited by 9 publications

(8 citation statements)

References 19 publications

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“…Such a fit results in an effective magnetic moment of 4.16µ B /Fe, somewhat less than the 5.92 µ B /Fe (4.90µ B /Fe) expected were all the Fe impurities effectively trivalent(divalent) with S=5/2 (3/2), but not unreasonable as some fraction of the Fe has likely been subsumed into intermetallic Pu 6 Fe [31].…”

Section: Plutonium Resultsmentioning

confidence: 89%

“…This deeper understanding of plutonium metal relates directly to the core competencies of the laboratory. This report is a summary of a number of papers published during the course of this project [1][2][3][4][5][6][7][8] and includes the results of muon spin resonance, magnetic susceptibility, and radiation damage measurements in plutonium and PuAm alloys..…”

Section: Introductionmentioning

confidence: 99%

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Final Report for Plutonium and Quantum Criticality LDRD 03-ERD-077

Fluss¹,

McCall²,

Chung³

et al. 2008

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Section: Plutonium Resultsmentioning

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Final Report for Plutonium and Quantum Criticality LDRD 03-ERD-077

Fluss¹,

McCall²,

Chung³

et al. 2008

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“…Hence the view that the f electrons are very close to a localization-delocalization transition was put forward early on by Johansson [1]. This has been confirmed by numerous experiments [2-4] and theoretical developements [5][6][7], and motivated a study of the PuAm alloy, which is a unique system to investigate the effect of lattice expansion of -Pu (see Fig. 1).…”

mentioning

confidence: 86%

Screening of Magnetic Moments in PuAm Alloy: Local Density Approximation and Dynamical Mean Field Theory Study

et al. 2008

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The puzzling absence of Pu magnetic moments in a PuAm environment is explored using the self-consistent dynamical mean field theory calculations in combination with the local density approximation. We argue that delta-Pu-Am alloys provide an ideal testbed for investigating the screening of moments from the single impurity limit to the dense limit. Several important effects can be studied: volume expansion, shift of the bare Pu on-site f energy level, and the reduction of the hybridization cloud resulting from the collective character of the Kondo effect in the Anderson lattice. These effects compensate each other and result in a coherence scale, which is independent of alloy composition, and is around 800 K.

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“…On the basis of this picture it was expected, and shown explicitly via a landmark continuous-time quantum Monte Carlo calculation 7 , that expanding the lattice would reduce the coherence temperature T * , making the moment of the f 5 configuration observable. Other theories, whereby the f moments are quenched directly by spin pairing, which is mediated by the spin orbit coupling, also account for the absence of moments in Pu, and suggest that this material is at a quantum critical point 8 .…”

mentioning

confidence: 96%

Screening of magnetic moments in PuAm alloy : LDA+DMFT study

Shim,

Haule,

Savrasov

et al. 2008

Preprint

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The puzzling absence of Pu magnetic moments in a PuAm environment is explored using the self-consistent Dynamical Mean Field Theory (DMFT) calculations in combination with the Local Density Approximation. We argue that δ-Pu -Am alloys provide an ideal test bed for investigating the screening of moments from the single impurity limit to the dense limit. Several important effects can be studied: volume expansion, shift of the bare Pu on-site f energy level, and the reduction of the hybridization cloud resulting from the collective character of the Kondo effect in the Anderson lattice. These effects compensate each other and result in a coherence scale, which is independent of alloy composition, and is around 800 K. We emphasize the role of the DMFT self-consistency condition, and multiplet splittings in Pu and Am atoms, in order to capture the correct value of the coherence scale in the alloy.

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Plutonium and quantum criticality

Cited by 9 publications

References 19 publications

Final Report for Plutonium and Quantum Criticality LDRD 03-ERD-077

Final Report for Plutonium and Quantum Criticality LDRD 03-ERD-077

Screening of Magnetic Moments in PuAm Alloy: Local Density Approximation and Dynamical Mean Field Theory Study

Screening of magnetic moments in PuAm alloy : LDA+DMFT study

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