Low-Temperature Properties of the Dense Kondo System Ce0.5La0.5B6

Nakamura, Shintaro; Сузукі, Осаму; Gotô, Terutaka; Sakatsume, S.; Matsumura, T.; Kunii, S.

doi:10.1143/jpsj.66.552

Cited by 28 publications

(25 citation statements)

References 19 publications

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“…Both spontaneous AFQ and AF order are therefore observed with T Q >T N and we consider only the former. For x = 0.5 the AFQ phase diagram (Nakamura et al 1997) is quite similar to that of fig. 63, namely the AFQ phase is only induced in finite field and T Q (H) increases with field.…”

Section: Pr-cef States and Antiferroquadrupolar Ordersupporting

confidence: 62%

Unconventional Superconductivity and Magnetism in Lanthanide and Actinide Intermetallic Compounds

Thalmeier

Zwicknagl²

2004

Handbook on the Physics and Chemistry of Rare Earths

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Section: Pr-cef States and Antiferroquadrupolar Ordersupporting

confidence: 62%

Unconventional Superconductivity and Magnetism in Lanthanide and Actinide Intermetallic Compounds

Thalmeier

Zwicknagl²

2004

Handbook on the Physics and Chemistry of Rare Earths

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“…154) Below x $ 0:6, the specific heat anomaly at T IV becomes obscure, 101) and the typical behavior ascribed to the Kondo effect emerges. 129,130) At the onset of phase IV, a large and sharp peak is observed in the specific heat.…”

Section: Thermodynamic Anomalymentioning

confidence: 99%

Multipole Orders and Fluctuations in Strongly Correlated Electron Systems

2009

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In this paper we review experimental and theoretical results on higher electronic multipoles in solids with strong correlations. Recent experiments and their theoretical interpretation have confirmed the ordering of octupoles and even higher multipoles in rare-earth and actinide compounds with f electrons. The concept of multipoles is critically examined in point groups where spherical tensors of different ranks mix. Using a phenomenological approach, we demonstrate how linear and nonlinear couplings of different multipoles lead to rich phase diagrams and anomalies in physical observables. As actual representative systems, we first consider Ce x La 1Àx B 6 , for which resonant X-ray scattering probed the octupole order for the first time, and NpO 2 , where quadrupoles induced by the octupole order have been observed. We then consider a class of compounds called skutterudites as the most convenient system for systematic study. Particular emphasis is placed on the ordering of scalar components from fourth-rank tensors (hexadecapoles) and sixth-rank tensors (hexacontatetrapoles). A comparison of a skutterudite PrFe 4 P 12 and URu 2 Si 2 is made, where much fewer carriers remain in the ordered states than in the disordered phase. The even number (two) of f electrons per site in Pr 3þ or U 4þ makes the system free from the Kramers degeneracy, in contrast to standard models for Mott transitions. Hence, it is pointed out that multipole orders, particularly the scalar order, should provide a new route for studying the dichotomy between the itinerant and localized behaviors of electrons.

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“…[27][28][29][30][31] In the case of K 4u2 = 0.5T Q and K 5u = −0.45T Q , the Ising-like excitations become quite dispersive and show softening at Γ and Z points as shown in Fig. 5(b).…”

Section: )mentioning

confidence: 99%

Spin-Orbital Wave Excitations in Orbitally Degenerate Exchange Model with Multipolar Interactions

Kusunose

Kuramoto

2001

J. Phys. Soc. Jpn.

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Elementary excitations in the multipole ordered state, which models the phase III in CeB6, are investigated by means of a generalized Holstein-Primakoff formalism. When different kinds of nearest-neighbor exchange interactions between multipoles are comparable to each other, orbitalflip excitations exhibit almost one-dimensional dispersion along the z axis. With high symmetry of the interactions, zero modes appear due to the macroscopic degeneracy of the ground state. The next-nearest-neighbor dipole-dipole interaction, which stabilizes the magnetic order of the phase III in CeB6, lifts the degeneracy and leads to gapfull excitation spectrum. When the octupole-octupole next-nearest-neighbor interaction exists simultaneously, the spectrum shows softening at Γ and Z points. These excitations may be probed by neutron scattering and ultrasonic measurements.KEYWORDS: orbital degeneracy, multipole moment, Holstein-Primakoff transformation, CeB 6 §1. Introduction Among many fascinating compounds with orbital degeneracy, CeB 6 shows an interesting entanglement of dipole, quadrupole as well as octupole moments.1-7) In particular, the entanglement gives a natural explanation for the longstanding inconsistency between the neutron diffraction and the B 11 -NMR measurements of the phase II.8) Namely, the field-induced octupole moment of Γ 2 -type, which arises through the mode mixing with the dipole moment, causes an extra internal field on the B nucleus sites. It explains the unexpected field-angle dependence in the NMR measurement.In discussing the transition from the antiferroquadrupolar (AFQ) phase, called II, to the magnetically ordered phase III, the mode mixing between dipoles and octupoles also plays an important role.9, 10) The present authors have made systematic analysis of multipole modes under the AFQ ordering.11) Then they have discussed effects of multipolar interactions on magnetic phases within the mean-field approximation. In their model Hamiltonian, the pseudo-dipole-type interactions for the next-nearest neighbors (NNN) are indispensable to account for the observed non-collinear magnetic ordering. The usual exchange-type interactions for the nearest neighbors (NN) are also important.What they found are the followings: 11) (i) the competition between the NN dipole-dipole and octupoleoctupole interactions strongly suppresses transition temperatures for simple AF magnetic order, (ii) the ferromagnetic NNN dipole-dipole interaction plays a dominant role in stabilizing the non-collinear ordering in the phase III, and (iii) the AF NNN octupole-octupole interaction is expected to be as strong as the dipole-dipole interaction since the phase III ′ is observed for relatively *

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Low-Temperature Properties of the Dense Kondo System Ce_0.5La_0.5B₆

Cited by 28 publications

References 19 publications

Unconventional Superconductivity and Magnetism in Lanthanide and Actinide Intermetallic Compounds

Unconventional Superconductivity and Magnetism in Lanthanide and Actinide Intermetallic Compounds

Multipole Orders and Fluctuations in Strongly Correlated Electron Systems

Spin-Orbital Wave Excitations in Orbitally Degenerate Exchange Model with Multipolar Interactions

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