Possible quadrupolar ordering in a Kondo-lattice compound<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Ce</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Pd</mml:mi></mml:mrow><mml:mrow><mml:mn>20</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math

Kitagawa, Jiro; Takeda, Nobuo; Ishikawa, Masayasu

doi:10.1103/physrevb.53.5101

Cited by 91 publications

(67 citation statements)

References 8 publications

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“…Several Ce-based compounds, such as CeB 6 , Ce 3 Pd 20 Si 6 , and Ce 3 Pd 20 Ge 6 , are of particular interest as they display such standalone MPO phases [14][15][16]. Close inspection of the magnetic phase diagram for Ce 3 Pd 20 Si 6 [17][18][19], as schematically shown in Fig.…”

Section: Introductionmentioning

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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Section: Introductionmentioning

confidence: 99%

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

et al. 2016

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“…Ce 3 Pd 20 Ge 6 shows antiferromagnetic (AFM) ordering at T N ¼ 0:75 K. 7) The FQ transition occurs at the 8c site and the AFM transition at the 4a site. The isostructural compounds Ce 3 Pd 20 Si 6 and Pr 3 Pd 20 Si 6 show the elastic softening of ðC 11 À C 12 Þ=2 and C 44 , and antiferroquadrupole (AFQ) ordering at low temperatures with anisotropic magnetic phase diagrams.…”

Section: Introductionmentioning

confidence: 99%

Quadrupole Ordering and Rattling Motion of Clathrate Compound Pr₃Pd₂₀Ge₆

et al. 2012

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We have investigated the quadrupole ordering of 4f-electrons and the rattling motion of guest rare-earth ions in the clathrate compound Pr 3 Pd 20 Ge 6 using ultrasonic measurements. The elastic constants ðC 11 À C 12 Þ=2 and C 44 exhibit considerable softening at low temperatures. A minimum of ðC 11 À C 12 Þ=2 at T Q1 ¼ 0:25 K indicates antiferroquadrupole ordering associated with a À 3 doublet of a crystal-field ground state at the 8c site, while a minimum of C 44 at T Q2 ¼ 60 mK indicates the ferroquadrupole ordering of a À 5 triplet of a crystal-field ground state at the 4a site. The antiferroquadrupole phase depending on magnetic field direction shows a highly anisotropic behavior. The fieldinduced ordered phase due to the level crossing of the CEF ground state at the 8c site in magnetic fields along the [001] direction has been found. Furthermore, for the elastic constant C 44 and the attenuation coefficient 44 we found a frequency dependence at two different temperatures of 15 and 25 K, which we describe in terms of the Debye-type dispersion with an Arrhenius-type relaxation time ¼ 0 expðE=k B T Þ for two different activation energies of E L ¼ 102 K and E H ¼ 198 K. These ultrasonic dispersions are caused by the thermally activated rattling motions of guest rare-earth Pr 3þ ions at the 4a site of Pr 3 Pd 20 Ge 6 .

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“…4(b)). Contrary to the Kondo-lattice behavior in the compounds [6,7] of X=Si and Ge, Ce 3 Pd 20 As 6 shows no Kondo effect, suggesting a relatively weak Kondo screening. The residual resistivity ratio is rather low, which is attributable to the inhomogeneity of atomic composition with variable stoichiometry.…”

Section: Resultsmentioning

confidence: 72%

“…The CEF ground states of the compounds of X=Si and Ge are the Γ 8 states at both Ce sites [7,10,17], which contribute to the quadrupolar and magnetic orderings. Each compound (X=Si or Ge) shows the coexistence of the Kondo-lattice behavior and ordered states [6,7,10,11]. On the other hand, the different CEF ground state at either 4a or 8c site is possibly realized in the phosphide with atomic disorder at the 4a site, where the Ce atoms are partially replaced with Pd 3 atoms [16].…”

Section: Introductionmentioning

confidence: 99%

“…We have focused on a series of ternary compounds of Ce-Pd-X (X=Si, Ge and P) with the C 6 Cr 23 -type structure [6,7,8,9,10,11,12,13,14,15,16], because this system provides a unique opportunity of systematic investigation of multipolar effects. These compounds have two crystallographicallyinequivalent Ce-sites of the 4a (O h symmetry) and 8c (T d symmetry) sites.…”

Section: Introductionmentioning

confidence: 99%

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