Observation of Symmetry Lowering Associated with the Metal–Insulator Transition in SmRu4P12 by 101Ru-NQR

Sekino, Masaki; Mito, T.; Takemura, Masaki; Wada, Shinji; Harima, Hisatomo; Kikuchi, Daisuke; Sato, Hideyuki; Sugawara, Hitoshi; Takeda, Nobuo; Zheng, Guojun

doi:10.1143/jpsj.76.043714

Cited by 34 publications

(21 citation statements)

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“…(13) show that the À 5g quadrupoles and hexadecapoles behave quite differently in the pseudo-sextet subspace. The hexadecapoles are more active within the quartet state, while the quadrupole contribution mainly comes from the quartet-doublet coupling.…”

Section: )mentioning

confidence: 90%

“…The induced moment X 5g 0 has linear temperature dependence close to the transition temperature T 5u , which is in agreement with the results of NQR experiments. 13) The 5g interaction has an effect to give rise to the anomaly at T ? in the specific heat.…”

Section: Zero Magnetic Fieldmentioning

confidence: 99%

“…Recent neutron diffraction experiments also found a clear magnetic superlattice with finite dipole moment on the Sm ions. 12) Furthermore, 101 Ru NQR experiments 13) detect a ð111Þ-type distortion of 4f wave functions below T MI , which suggests the presence of uniform quadrupole moments along the ½111 direction. Then magnetic multipoles with representations À 4u and À 5u are candidates for the order parameter since they both break the time-reversal symmetry and may induce uniform À 5g moments.…”

Section: Introductionmentioning

confidence: 99%

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

Kiss

Kuramoto

2009

J. Phys. Soc. Jpn.

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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.

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Section: )mentioning

confidence: 90%

Section: Zero Magnetic Fieldmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Kiss

Kuramoto

2009

J. Phys. Soc. Jpn.

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“…On the other hand, recent experimental results suggest mixing of dipole and octupole degrees of freedom. 12,13 We analyze the wave functions in the CEF states taking higher order hybridization processes. It is found that the closeness of the J = 7/2 excited state above the J = 5/2 ground state tends to compensate the small ratio of hybridization over excitation energy of 4 f 6 intermediate states.…”

Section: Introductionmentioning

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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“…To date there is no conclusive evidence to decide which possibility is more reasonable. The possibility a) may be possible, because the 101 Ru-NQR measurement suggests that the broken three-fold symmetry is smaller than the experimental resolution (see the discussion in the reference 17 ). On the other hand, in the 31 P-NMR measurement using a powder sample, resonance lines measured below T MI show a tendency toward orientation of the crystals against external field.…”

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confidence: 99%

³¹P-NMR Study in Single Crystal SmRu₄P₁₂

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Observation of Symmetry Lowering Associated with the Metal–Insulator Transition in SmRu₄P₁₂ by ¹⁰¹Ru-NQR

Cited by 34 publications

References 20 publications

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

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

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

³¹P-NMR Study in Single Crystal SmRu₄P₁₂

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Observation of Symmetry Lowering Associated with the Metal–Insulator Transition in SmRu4P12 by 101Ru-NQR

Cited by 34 publications

References 20 publications

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

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

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

31P-NMR Study in Single Crystal SmRu4P12

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Observation of Symmetry Lowering Associated with the Metal–Insulator Transition in SmRu₄P₁₂ by ¹⁰¹Ru-NQR

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

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

³¹P-NMR Study in Single Crystal SmRu₄P₁₂