NMR Study on the Spin Structure of CeB<sub>6</sub>

Takigawa, Masaharu; Yaśuoka, Hiroshi; Tanaka, Takaho; Ishizawa, Y.

doi:10.1143/jpsj.52.728

Cited by 181 publications

(143 citation statements)

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“…To our knowledge, the only other case for which FI-AFO HF effects have been reported was for the AFQ ordered state of CeB 6 . 101,102) In the ordered state, we have also observed oscillatory spin-echo decay for the O ð3Þ site. The spin-echo oscillations are well understood in terms of an axially symmetric EFG created by longitudinal triple-q AFQ ordering.…”

Section: Multipolar Ordering In Npomentioning

confidence: 70%

Ligand and Actinide NMR Studies in Actinide Oxides and Intermetallic Compounds

et al. 2007

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In this paper we present highlights from a 6-year program of NMR/NQR/AFNMR studies carried out on both actinide and ligand nuclear spins in oxides and intermetallic compounds of the actinide elements U, Np, and Pu. We begin with the large family of actinide 115 compounds, consisting of metallic antiferromagnets, metamagnets, Pauli paramagnets, and the superconducting Pu-based systems. Short summaries are presented of 69;71 Ga NMR studies of the exotic metamagnet NpCoGa 5 , the surprisingly inhomogeneous UCoGa 5 , and the heavy-fermion ''high-T c '' superconductors PuTGa 5 , T ¼ Rh and Co. The case of microdomains in the metallic antiferromagnet UGa 3 is briefly reviewed. Next, we summarize the direct and indirect 235 U NMR studies on USb 2 and URh 3 . These are the first studies of their kind and the only studies of 235 U NMR in a metallic environment. Under the heading of actinide oxides we recap our original studies of 235 U and 17 O NMR in UO 2 , followed by a summary of our investigation of multipolar ordering in NpO 2 via 17 O NMR, in which the 237 Np NMR parameters were determined via cross-relaxation effects. And finally, we summarize our 31 P study of the ferromagnetic transition in the filled Skutterudite UFe 4 P 12 .

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Section: Multipolar Ordering In Npomentioning

confidence: 70%

Ligand and Actinide NMR Studies in Actinide Oxides and Intermetallic Compounds

et al. 2007

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“…Though great progresses have been achieved, until now there are many puzzles that need to be solved. For example, the magnetic ordered phases revealed by neutron scattering 20,[28][29][30][31][32] are not consistent with those by nuclear magnetic resonance 22 . In addition, the appearance of a "magnetically hidden order" phase has been confirmed by X-ray diffraction experiment 33 , but the long suspected multipolar origin of this phase is still under intense debate nowadays.…”

Section: Introductionmentioning

confidence: 80%

“…So what is the possible mechanism for it? First of all, the magnetic structure of CeB 6 is extremely complicated [20][21][22][23] , and there is complex competition among different multipolar orders/interactions (dipolar, quadrupolar, and octupolar) at low temperature 24,28,33 . Initially, it seems that the transition near 20 K is magnetic.…”

Section: Discussionmentioning

confidence: 99%

Anomaly in the temperature-dependent electronic structure of the heavy-fermion compound CeB6 : A theoretical investigation by means of a first-principles many-body approach

2017

Phys. Rev. B

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The temperature-dependent electronic structures of heavy fermion compound CeB 6 are investigated thoroughly by means of the combination of density functional theory and single-site dynamical mean-field theory. The band structure, density of states, and 4 f valence state fluctuation of CeB 6 are calculated in a broad temperature range of 10 ∼ 120 K. Overall, the 4 f electrons remain incoherent, approximately irrespective of the temperature. However, we find that these observables exhibit some unusual features near 20 K. In addition, the evolution of 4 f orbital occupancy, total angular momentum, and total energy with respect to temperature shows apparent singularity around 20 K. We believe that these tantalizing characteristics are probably related to a "hidden" electronic transition.

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“…3 (b) for B [110]), which in the case of CeB 6 would be shifted to much higher fields. This distinctive field dependence results from the field-induced dipolar moments modulated by the underlying orbital order [7,23,28] -a renowned signature of the AFQ state. Hence, our results demonstrate that the order parameter of phase II in Ce 3 Pd 20 Si 6 represents a short-range version of the AFQ ordering with the same propagation vector and possibly a similar structure as in CeB 6 , residing on the simple-cubic 8c Ce sublattice.…”

Section: Resultsmentioning

confidence: 99%

Incommensurate short-range multipolar order parameter of phase II in Ce3Pd20Si6

et al. 2016

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The clathrate compound Ce 3 Pd 20 Si 6 is a heavy-fermion metal that exhibits magnetically hidden order at low temperatures. Reputedly, this exotic type of magnetic ground state, known as "phase II", could be associated with the ordering of Ce 4 f quadrupolar moments. In contrast to conventional (dipolar) order, it has vanishing Bragg intensity in zero magnetic field and, as a result, has escaped direct observation by neutron scattering until now. Here we report the observation of diffuse magnetic neutron scattering induced by an application of magnetic field along either the [110] or the [001] direction within phase II. The broad elastic magnetic signal that surrounds the (111) structural Bragg peak can be attributed to a short-range G-type antiferromagnetic arrangement of field-induced dipoles modulated by the underlying multipolar order on the simple-cubic sublattice of Ce ions occupying the 8c Wyckoff site. In addition, for magnetic fields applied along the [001] direction, the diffuse magnetic peaks in Ce 3 Pd 20 Si 6 become incommensurate, suggesting a more complex modulated structure of the underlying multipolar order that can be continuously tuned by a magnetic field.

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NMR Study on the Spin Structure of CeB₆

Cited by 181 publications

References 5 publications

Ligand and Actinide NMR Studies in Actinide Oxides and Intermetallic Compounds

Ligand and Actinide NMR Studies in Actinide Oxides and Intermetallic Compounds

Anomaly in the temperature-dependent electronic structure of the heavy-fermion compound CeB6 : A theoretical investigation by means of a first-principles many-body approach

Incommensurate short-range multipolar order parameter of phase II in Ce3Pd20Si6

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NMR Study on the Spin Structure of CeB6

Cited by 181 publications

References 5 publications

Ligand and Actinide NMR Studies in Actinide Oxides and Intermetallic Compounds

Ligand and Actinide NMR Studies in Actinide Oxides and Intermetallic Compounds

Anomaly in the temperature-dependent electronic structure of the heavy-fermion compound CeB6 : A theoretical investigation by means of a first-principles many-body approach

Incommensurate short-range multipolar order parameter of phase II in Ce3Pd20Si6

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NMR Study on the Spin Structure of CeB₆