Erratum: Hidden Order and Low-Energy Excitations in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>NpO</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:math>[Phys. Rev. Lett.<b>97</b>, 207203 (2006)]

Santini, P.; Carretta, S.; Magnani, N.J.; Amoretti, G.; Caciuffo, R.

doi:10.1103/physrevlett.101.139902

Cited by 25 publications

(37 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Among these, triakontadipoles are most relevant. 84,126) The direct observation of triakontadipoles is more difficult than that of octupoles since the latter can be directly probed by Xray scattering as discussed below.…”

Section: )mentioning

confidence: 99%

Multipole Orders and Fluctuations in Strongly Correlated Electron Systems

2009

View full text Add to dashboard Cite

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.

show abstract

Section: )mentioning

confidence: 99%

Multipole Orders and Fluctuations in Strongly Correlated Electron Systems

2009

View full text Add to dashboard Cite

show abstract

“…(17). The uniform À 5g moment is induced since h1jX X 5g j1i ¼ h4jX X 5g j4i, where j1i and j4i are the ground states on the A and B sublattices, respectively.…”

Section: Zero Magnetic Fieldmentioning

confidence: 99%

“…We have used the notations and for the secondand fourth-order terms, respectively, of order parameters in eq. (17). The coefficients of the mode mixing terms are introduced as ðnÞ 1;2;... , where is index for the symmetry or magnetic field and n is the order of the term.…”

Section: )mentioning

confidence: 99%

Ordering and Crossover in a Pseudo-Sextet Localized Electron Model –Possible Scenario for SmRu₄P₁₂Skutterudite–

Kiss

Kuramoto

2009

J. Phys. Soc. Jpn.

View full text Add to dashboard Cite

A crystalline electric field (CEF) model of localized 4f 5 electrons is proposed for understanding intriguing ordering phenomena in SmRu 4 P 12 . We take the CEF quartet and doublet (pseudo-sextet) of the Hund's rule ground state with J ¼ 5=2, and include intersite interactions between multipoles by the mean-field theory. The model leads to a multipole order with representation À 5u , and shows the following features: (i) increasing transition temperature T MI with increasing magnetic field; (ii) an anomaly in specific heat and other thermodynamic quantities at lower temperature T ? , (iii) sharpening of the anomaly at T ? as the magnetic field increases. These behaviors reproduce salient features observed experimentally in SmRu 4 P 12 . Possible mechanisms for spontaneous magnetic moment are discussed.

show abstract

“…A crucial role is played by the CF potential acting on the actinide ions, as this quantity determines the nature of the ground state and in particular the expectation value and the polarizability of the unquenched multipolar degrees of freedom. For instance, whereas in uranium dioxide a concomitant magnetic-dipole and electric-quadrupole order has been observed [5], in neptunium dioxide the primary order parameter driving the phase transition occurring at low temperature is a rank-5 magnetic multipole [6,7]. This work is based on the weak crystal field approximation.…”

Section: Introductionmentioning

confidence: 99%

Ab initiocalculations of crystal-field for actinide dioxides

Gaigalas¹,

Gaidamauskas²,

Rudzikas³

et al. 2009

Lithuanian J. Phys.

Self Cite

View full text Add to dashboard Cite

In this paper we report on large-scale multiconfiguration Dirac-Fock and relativistic configuration-interaction calculations in the framework of crystal-field theory of the actinide dioxides. In order to be able to perform such calculations the package of the relativistic atomic structure calculations GRASP2K has been extended. The correlation and relativistic effects were taken into account. Calculated crystal-field energy levels of actinide dioxides are compared with other theoretical and with experimental results based on inelastic neutron scattering measurements.

show abstract

Erratum: Hidden Order and Low-Energy Excitations inNpO2[Phys. Rev. Lett.97, 207203 (2006)]

Cited by 25 publications

References 0 publications

Multipole Orders and Fluctuations in Strongly Correlated Electron Systems

Multipole Orders and Fluctuations in Strongly Correlated Electron Systems

Ordering and Crossover in a Pseudo-Sextet Localized Electron Model –Possible Scenario for SmRu₄P₁₂Skutterudite–

Ab initiocalculations of crystal-field for actinide dioxides

Contact Info

Product

Resources

About

Erratum: Hidden Order and Low-Energy Excitations inNpO2[Phys. Rev. Lett.97, 207203 (2006)]

Cited by 25 publications

References 0 publications

Multipole Orders and Fluctuations in Strongly Correlated Electron Systems

Multipole Orders and Fluctuations in Strongly Correlated Electron Systems

Ordering and Crossover in a Pseudo-Sextet Localized Electron Model –Possible Scenario for SmRu4P12Skutterudite–

Ab initiocalculations of crystal-field for actinide dioxides

Contact Info

Product

Resources

About

Ordering and Crossover in a Pseudo-Sextet Localized Electron Model –Possible Scenario for SmRu₄P₁₂Skutterudite–