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apRoberts-Warren, Nicholas; Dioguardi, A. P.; Shockley, Abigail; Lin, C. H.; Crocker, John C.; Klavins, P.; Pines, David; Yang, Yi-feng; Curro, N. J.

doi:10.1103/physrevb.83.060408

Cited by 20 publications

(35 citation statements)

References 21 publications

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“…In CePt 2 In 7 K HF was determined via 195 Pt NMR in a powder sample, thus the precision was not as high as for a single crystal in which the full susceptibility tensor can be measured (13). The new results in the CeRhIn 5 reported here, however, were indeed acquired in a single crystal and confirm that relocalization behavior appears to be a common feature of antiferromagnetic materials.…”

Section: Antiferromagnetism and Relocalizationmentioning

confidence: 47%

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Long range order and two-fluid behavior in heavy electron materials

Shirer

Shockley

Dioguardi

et al. 2012

Proc. Natl. Acad. Sci. U.S.A.

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The heavy electron Kondo liquid is an emergent state of condensed matter that displays universal behavior independent of material details. Properties of the heavy electron liquid are best probed by NMR Knight shift measurements, which provide a direct measure of the behavior of the heavy electron liquid that emerges below the Kondo lattice coherence temperature as the lattice of local moments hybridizes with the background conduction electrons. Because the transfer of spectral weight between the localized and itinerant electronic degrees of freedom is gradual, the Kondo liquid typically coexists with the local moment component until the material orders at low temperatures. The two-fluid formula captures this behavior in a broad range of materials in the paramagnetic state. In order to investigate two-fluid behavior and the onset and physical origin of different long range ordered ground states in heavy electron materials, we have extended Knight shift measurements to URu 2 Si 2 , CeIrIn 5 , and CeRhIn 5 . In CeRhIn 5 we find that the antiferromagnetic order is preceded by a relocalization of the Kondo liquid, providing independent evidence for a local moment origin of antiferromagnetism. In URu 2 Si 2 the hidden order is shown to emerge directly from the Kondo liquid and so is not associated with local moment physics. Our results imply that the nature of the ground state is strongly coupled with the hybridization in the Kondo lattice in agreement with phase diagram proposed by Yang and Pines.nuclear magnetic resonance | heavy fermion | hyperfine couplings C ompetition between different energy scales gives rise to a rich spectrum of emergent ground states in strongly correlated electron materials. In the heavy fermion compounds, a lattice of nearly localized f electrons interacts with a sea of conduction electrons, and depending on the magnitude of this interaction different types of long-range order may develop at low temperatures (1). The Kondo lattice model strives to capture the essential physics of heavy fermion materials by considering the various magnetic interactions between the conduction electron spins, S c , and the local moment spins, S f (2). Different ground states can emerge depending on the relative strengths of the interaction, J, between S c and S f and the intersite interaction, J f f , between the S f spins (3, 4). Much of the physics of the phase diagram is driven by a quantum critical point, which separates long-range ordered ground states from those in which the local moments have fully hybridized with the conduction electrons to form itinerant states with large effective masses and large Fermi surfaces (5). In several materials quantum critical fluctuations give rise to anomalous non-Fermi liquid behavior in various bulk transport and thermodynamic quantities (6-8).In recent years, evidence has emerged that in the high temperature disordered phase the electronic degrees of freedom simultaneously exhibit both itinerant and localized behavior (9). Below a temperature T Ã that marks the onset...

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Section: Antiferromagnetism and Relocalizationmentioning

confidence: 47%

“…Fig. 13 shows the scaled K HF versus T∕T Ã for URu 2 Si 2 , CeRhIn 5 , CeCoIn 5 , and the antiferromagnet CePt 2 In 7 (T N ¼ 5.2 K, T Ã ≈ 40 K) (11,13). The onset of hybridization at T Ã is identical for all the compounds, but the low temperature behavior depends critically on the ground state.…”

Section: Antiferromagnetism and Relocalizationmentioning

confidence: 93%

Long range order and two-fluid behavior in heavy electron materials

Shirer

Shockley

Dioguardi

et al. 2012

Proc. Natl. Acad. Sci. U.S.A.

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“…This 'relocalization' phenomenon has been observed previously in other heavy fermion materials and may reflect a precursor to the emergence of local moment order at higher dopings. 18,28 We have also measured the spin-lattice-relaxation rate as a function of temperature at the P site, as shown in Fig. 6, which includes data for the Si in pure URu 2 Si 2 .…”

Section: Temperature (K)mentioning

confidence: 99%

NMR investigation of antiferromagnetism and coherence in URu2Si2−xPx

Shirer¹,

Lawson²,

Kissikov³

et al. 2017

Phys. Rev. B

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We report 31 P and 29 Si NMR in single crystals of URu2Si2−xPx for x = 0.09 and x = 0.33. The spectra in the x = 0.33 sample are consistent with a homogenous commensurate antiferromagnetic phase below TN ∼ 37 K. The Knight shift exhibits an anomaly at the coherence temperature, T * , that is slightly enhanced with P doping. Spin lattice relaxation rate data indicate that the density of states is suppressed for x = 0.09 below 30 K, similar to the undoped compound, but there is no evidence of long range order at this concentration. Our results suggest that Si substitution provides chemical pressure without inducing electronic inhomogeneity.

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“…Also, the delocalization temperature, T L , is defined by the singularity of the inverse of χ ff (q * ) , which yields Eq. [7] for f 0 >1. This is a description within the two-fluid model of the dual role of the Kondo coupling J in promoting both magnetic polarization and hybridization.…”

Section: Collective Hybridization and The Two-fluid Modelmentioning

confidence: 99%

Toward a new microscopic framework for Kondo lattice materials

Lonzarich¹,

Pines²,

Yang³

2016

Rep. Prog. Phys.

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Understanding the emergence and subsequent behavior of heavy electrons in Kondo lattice materials is one of the grand challenges in condensed matter physics. From this perspective we review the progress that has been made during the past decade and suggest some directions for future research. Our focus will be on developing a new microscopic framework that incorporates the basic concepts that emerge from a phenomenological description of the key experimental findings.

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Kondo liquid emergence and relocalization in the approach to antiferromagnetic ordering in CePt2In7

Cited by 20 publications

References 21 publications

Long range order and two-fluid behavior in heavy electron materials

Long range order and two-fluid behavior in heavy electron materials

NMR investigation of antiferromagnetism and coherence in URu2Si2−xPx

Toward a new microscopic framework for Kondo lattice materials

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