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Mannix, D.; Tanaka, Yoshikazu; Carbone, Dina; Bernhoeft, N.; Kunii, S.

doi:10.1103/physrevlett.95.117206

Cited by 110 publications

(103 citation statements)

References 18 publications

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“…The elevation angle is written as ξ = π/2 − θ with θ being the incident angle. [15]. The dotted and the dashed lines are the result for the Γ5u-type octupole order as described in the text.…”

Section: Resonant X-ray Scattering From Multipolesmentioning

confidence: 99%

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Diffraction from ordered states of higher multipoles

Kuramoto

Kusunose

Kiss

2006

Physica B: Condensed Matter

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Possible ways of identification are discussed of an electronic order of higher multipoles such as octupoles and hexadecapoles. A particularly powerful method is resonant X-ray scattering (RXS) using quadrupolar resonance processes called E2. The characteristic azimuthal angle dependence of Ce0.7La0.3B6 is interpreted as evidence of antiferro-octupole order. For PrRu4P12, eightfold pattern against azimuthal angle is predicted if its metal-insulator transition is a consequence of a hexadecapole order. In non-resonant superlattice Bragg scattering, hexadecapole contribution may also be identified because of absence of quadrupole component.

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Section: Resonant X-ray Scattering From Multipolesmentioning

confidence: 99%

“…Recent measurement has obtained information of the order parameter symmetry in phase IV in Ce0.7La0.3B6 below TIV = 1.5 K [15]. The superlattice Bragg reflections at Q = (3/2, 3/2, 3/2) is taken with the rotation axis normal to the [111] surface.…”

Section: Resonant X-ray Scattering From Multipolesmentioning

confidence: 99%

Diffraction from ordered states of higher multipoles

Kuramoto

Kusunose

Kiss

2006

Physica B: Condensed Matter

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“…4 (c3). This phase can be induced by field starting from the doping level of x = 0.2 [18], yet its order parameter remains unknown, and dipolar short-range correlations coexisting with antiferrooctupolar ordering along R( 2 ) were proposed [39]. The clear transition at T IV in specific heat [28,40] suggests that phase IV takes over the role of the low-temperature ordered phase [15].…”

mentioning

confidence: 99%

Magnetic field and doping dependence of low-energy spin fluctuations in the antiferroquadrupolar compoundCe1−xLaxB6

et al. 2015

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CeB 6 is a model compound exhibiting antiferroquadrupolar (AFQ) order, its magnetic properties being typically interpreted within localized models. More recently, the observation of strong and sharp magnetic exciton modes forming in its antiferromagnetic (AFM) state at both ferromagnetic and AFQ wave vectors suggested a significant contribution of itinerant electrons to the spin dynamics. Here we investigate the evolution of the AFQ excitation upon the application of an external magnetic field and the substitution of Ce with non-magnetic La, both parameters known to suppress the AFM phase. We find that the exciton energy decreases proportionally to T N upon doping. In field, its intensity is suppressed, while its energy remains constant. Its disappearance above the critical field of the AFM phase is preceded by the formation of two modes, whose energies grow linearly with magnetic field upon entering the AFQ phase. These findings suggest a crossover from itinerant to localized spin dynamics between the two phases, the coupling to heavy-fermion quasiparticles being crucial for a comprehensive description of the magnon spectrum.PACS numbers: 75.30. Mb, 75.30.Ds, 78.70.Nx A current focus of research in heavy fermion (HF) compounds is the study of quantum critical points (QCP) -phase transitions achieved at zero temperature by tuning an external parameter such as magnetic field, doping, or pressure. One possible signature of a QCP is the change of the quasiparticle character from localized to itinerant, when the transition is connected with a breakdown of the Kondo effect and the removal of f-electrons from the Fermi surface (FS). Such an effect was observed, for example, by transport measurements in the prototypical QCP system YbRh 2 (Si 1−x Ge x ) 2 at the critical field of the lowtemperature antiferromagnetic (AFM) phase [1, 2]. Recently, the list of QCP materials was extended with the cubic Kondo lattice compound Ce 3 Pd 20 Si 6 [3][4][5], whose magnetic phase diagram comprises an antiferroquadrupolar (AFQ) phase below T Q = 0.5 K and an AFM phase at even lower temperatures. For the latter phase, a field-induced QCP was observed at the critical field B * = 0.9 T and the concomitant FS reconstruction was related to the destruction of the Kondo effect [3].CeB 6 was one of the first known AFQ compounds, where the multipolar order was observed both indirectly as an anomaly in specific heat at T Q = 3.2 K [6] and directly by resonant x-ray diffraction [7] or neutron diffraction [8, 9] as a weak magnetic Bragg peak centered at the Q AFQ = R(

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“…26,27 These features are analogous to those in the phase IV of Ce 1−x La x B 6 with x ∼ 0.7, where the antiferro octupole order has been proposed, 28,29 and confirmed by various measurements. [30][31][32] The cubic symmetry in Ce 1−x La x B 6 allows pure octupoles which should have zero internal field at the Ce nucleus site, but with finite off-center field which has recently be detected by neutron scattering.…”

Section: Bilinear Coupling Of Dipoles and Octupoles In Smru 4 P 12mentioning

confidence: 99%

Toward Identification of Order Parameters in Skutterudites –a Wonderland of Strong Correlation Physics–

Kuramoto

Kiss

2008

J. Phys. Soc. Jpn.

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Current status is described toward identifying unconventional order parameters in filled skutterudites with unique ordering phenomena. The order parameters in PrFe 4 P 12 and PrRu 4 P 12 are discussed in relation to associated crystalline electric field (CEF) states and angular form factors. By phenomenological Landau analysis, it is shown that a scalar order model explains most properties in both PrFe 4 P 12 and PrRu 4 P 12 with very different magnetic properties. In particular, the highly anisotropic susceptibility induced by uniaxial pressure in PrFe 4 P 12 is explained in terms of two types of couplings. In the case of SmRu 4 P 12 , the main order parameter at low field is identified as magnetic octupoles. A microscopic mechanism is proposed how the dipole and octupole degrees of freedom mix under the point group T h of skutterudites.

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Order Parameter Segregation inCe0.7La0.3B6:4fOctopole and

Cited by 110 publications

References 18 publications

Diffraction from ordered states of higher multipoles

Diffraction from ordered states of higher multipoles

Magnetic field and doping dependence of low-energy spin fluctuations in the antiferroquadrupolar compoundCe1−xLaxB6

Toward Identification of Order Parameters in Skutterudites –a Wonderland of Strong Correlation Physics–

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