μSR study on filled skutterudite PrRu4P12

Saha, Shanta; Higemoto, Wataru; Koda, A.; Ohishi, Kazuki; Kadono, R.; Aoki, Yuji; Sugawara, Hitoshi; Sato, Hideyuki

doi:10.1016/j.physb.2005.01.249

Cited by 7 publications

(4 citation statements)

References 11 publications

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“…19) Concerning the nature of the triplet ground state in the charge order phase, the effective Hamiltonian predicts that the ratio of the possible magnetic transition temperature to T co should be unusually small, that is, of the order of 10 À3 . 19) In fact, no sign of long-range order has been detected so far below T co ¼ 63 K in PrRu 4 P 12 (no magnetic ordering down to 20 mK by zero-field SR 20) ). Thus, one important issue to be clarified is whether and how the degeneracy of the triplet CEF ground state is lifted as T approaches T ¼ 0.…”

Section: Introductionmentioning

confidence: 94%

f-Electron-Nuclear Hyperfine-Coupled Multiplets in the Unconventional Charge Order Phase of Filled Skutterudite PrRu₄P₁₂

et al. 2011

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The filled skutterudite PrRu 4 P 12 is known to undergo an unconventional charge order phase transition at 63 K, below which two sublattices with distinct f -electron crystalline-electric-field ground states are formed. In this paper, we study experimentally and theoretically the properties of the charge order phase at very low temperature, particularly focusing on the nature of the degenerate triplet ground state on one of the sublattices. First, we present experimental results of specific heat and magnetization measured with high quality single crystals. In spite of the absence of any symmetry breaking, the specific heat shows a peak structure at T p ¼ 0:30 K in zero field; it shifts to higher temperatures as the magnetic field is applied. In addition, the magnetization curve has a remarkable rounding below 1 T. Then, we study the origin of these experimental findings by considering the hyperfine interaction between 4f electron and nuclear spin. We demonstrate that the puzzling behaviors at low temperatures can be well accounted for by the formation of 4f-electron-nuclear hyperfine-coupled multiplets, the first thermodynamical observation of its kind.

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Section: Introductionmentioning

confidence: 94%

f-Electron-Nuclear Hyperfine-Coupled Multiplets in the Unconventional Charge Order Phase of Filled Skutterudite PrRu₄P₁₂

et al. 2011

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“…Experimentally, however, no evidence of a long-range ordering has been obtained so far. 21,22) Instead, there is evidence that the triplet level is weakly split at low temperatures. 21,23) That is, local cubic symmetry is weakly broken at low T .…”

Section: 11)mentioning

confidence: 99%

Multipole Phenomena and Superconductivity in Pr-based Filled Skutterudites

et al. 2008

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Field-orientation dependent specific heat C(H, θ) and the magnetization M (H, θ) have been measured on the Pr-based filled skutterudite compounds PrOs4Sb12 and PrFe4P12. In PrOs4Sb12, fourfold angular oscillations of C(H, θ) have been observed in the normal state above the upper critical field Hc2 as well as in the vortex state. Field variation of the normalstate oscillation in C(H, θ) strongly suggests that antiferroquadrupolar fluctuations exist in the wide region above Hc2. The oscillation exhibits a sign reversal below Hc2, whose origin is attributed to the nodal structure in which the superconducting gap takes minima (point nodes) along [100] directions. In PrFe4P12, an exotic ordered phase (A-phase) below TA(H = 0)=6.5 K has been examined. Both M (H, θ) within the A-phase and TA(H, θ) show a smooth angular variation with a cubic anisotropy for H rotated in the (001) and (110) planes. The results strongly suggest that cubic symmetry is preserved in the A-phase; the order parameter is of Γ + 1 type.

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“…Several µSR studies of Pr-based filled skutterudites have been reported. 8,[15][16][17][18][19][20] The magnetic environment of the muon creates a local field H loc at the muon site that causes muon spin relaxation. Relaxation mechanisms can be divided into two classes, depending on the behavior of H loc :…”

Section: Introductionmentioning

confidence: 99%

Muon spin relaxation and hyperfine-enhanced 141Pr nuclear spin dynamic in Pr(Os,Ru)4Sb12 and (Pr,La)Os4Sb12

Shu,

MacLaughlin,

Aoki

et al. 2007

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Zero-and longitudinal-field muon spin relaxation (µSR) experiments have been carried out in the alloy series Pr(Os1−xRux)4Sb12 and Pr1−yLayOs4Sb12 to elucidate the anomalous dynamic muon spin relaxation observed in these materials. The damping rate Λ associated with this relaxation varies with temperature, applied magnetic field, and dopant concentrations x and y in a manner consistent with the "hyperfine enhancement" of 141 Pr nuclear spins first discussed by Bleaney in 1973. This mechanism arises from Van Vleck-like admixture of magnetic Pr 3+ crystalline-electricfield-split excited states into the nonmagnetic singlet ground state by the nuclear hyperfine coupling, thereby increasing the strengths of spin-spin interactions between 141 Pr and muon spins and within the 141 Pr spin system. We find qualitative agreement with this scenario, and conclude that electronic spin fluctuations are not directly involved in the dynamic muon spin relaxation.

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μSR study on filled skutterudite PrRu4P12

Cited by 7 publications

References 11 publications

f-Electron-Nuclear Hyperfine-Coupled Multiplets in the Unconventional Charge Order Phase of Filled Skutterudite PrRu₄P₁₂

f-Electron-Nuclear Hyperfine-Coupled Multiplets in the Unconventional Charge Order Phase of Filled Skutterudite PrRu₄P₁₂

Multipole Phenomena and Superconductivity in Pr-based Filled Skutterudites

Muon spin relaxation and hyperfine-enhanced 141Pr nuclear spin dynamic in Pr(Os,Ru)4Sb12 and (Pr,La)Os4Sb12

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μSR study on filled skutterudite PrRu4P12

Cited by 7 publications

References 11 publications

f-Electron-Nuclear Hyperfine-Coupled Multiplets in the Unconventional Charge Order Phase of Filled Skutterudite PrRu4P12

f-Electron-Nuclear Hyperfine-Coupled Multiplets in the Unconventional Charge Order Phase of Filled Skutterudite PrRu4P12

Multipole Phenomena and Superconductivity in Pr-based Filled Skutterudites

Muon spin relaxation and hyperfine-enhanced 141Pr nuclear spin dynamic in Pr(Os,Ru)4Sb12 and (Pr,La)Os4Sb12

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Product

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f-Electron-Nuclear Hyperfine-Coupled Multiplets in the Unconventional Charge Order Phase of Filled Skutterudite PrRu₄P₁₂

f-Electron-Nuclear Hyperfine-Coupled Multiplets in the Unconventional Charge Order Phase of Filled Skutterudite PrRu₄P₁₂