Possible Mass Enhancement by Multipole Fluctuations Excited via the Singlet–Triplet Crystal Electric Field States in PrOs<sub>4</sub>Sb<sub>12</sub>: Sb-NMR Studies Using a Single Crystal

Tou, Hideki; Inaoka, Y.; Doi, Masahiro; Sera, Masafumi; Asaki, Kenji; Kotegawa, Hisashi; Sugawara, Hitoshi; Sato, Hideyuki

doi:10.1143/jpsj.80.074703

Cited by 17 publications

(10 citation statements)

References 68 publications

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“…Furthermore, on the basis of a recent NMR experiment, it was proposed that the origin of HF behavior was low-lying CEF excitations. 72 Considering the role of heavy quasiparticles in unconventional superconductivity, 67,70 the small amount of line broadening in the present paper does not contradict the correlation of the HF behavior with low-lying CEF excitations.…”

Section: Origin Of the Heavy Fermion Behavior In The Series Of Rosmentioning

confidence: 44%

Atomic dynamics of low-lying rare-earth guest modes in heavy fermion filled skutteruditesROs4Sb12(
Tsutsui
¹
,
Uchiyama
²
,
Sutter
³

et al. 2012
Phys. Rev. B
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The atomic dynamics of the guest modes in heavy fermion filled skutterudites ROs 4 Sb 12 were investigated by inelastic x-ray scattering. Comparison of the phonon dispersion relations for the filled skutterudite SmOs 4 Sb 12 with those for the unfilled skutterudite IrSb 3 indicates that the guest modes in filled skutterudites are observed as additional modes in the unfilled skutterudites. The dispersion relations for IrSb 3 and SmOs 4 Sb 12 agree reasonably well with the results obtained by ab initio calculations for IrSb 3 and LaOs 4 Sb 12 , respectively. The rare-earth dependence of the inelastic x-ray scattering spectrum in the series of ROs 4 Sb 12 compounds is difficult to interpret in terms of changes in the atomic mass and electron number of the rare-earth atom inserted into the Sb cage. The combination of inelastic x-ray scattering and x-ray absorption spectroscopy reveals a correlation between the guest mode energy and the guest free space in these compounds. The rare-earth dependence of the inelastic x-ray scattering spectrum indicates the mediation of heavy fermion behavior by the atomic motion of the guest in some ROs 4 Sb 12 compounds and the electron-phonon coupling between the guest modes with 4f -electrons and conduction electrons in the series of ROs 4 Sb 12 compounds.

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Section: Origin Of the Heavy Fermion Behavior In The Series Of Rosmentioning

confidence: 44%

Atomic dynamics of low-lying rare-earth guest modes in heavy fermion filled skutteruditesROs4Sb12(
Tsutsui
¹
,
Uchiyama
²
,
Sutter
³

et al. 2012
Phys. Rev. B
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27
2
10
0
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“…As for the principal axis of EFG at the As site, one cannot determine it from NMR spectrum measurements on the powder compound. As described in our previous paper [33], Tou et al [35,36] have determined the principal axis of the EFG at the Sb sites in the isostructural PrOs 4 Sb 12 compound from NMR measurements using a single crystal, which reports that, although there is one crystallographically equivalent Sb site in the filled skutterudite structure, there are three different Sb sites with the principal axis parallel to [100], [010], and [001] of the crystal, respectively, due to the local symmetry of the 24g site of the Sb ions. The same conclusion for the direction of the EFG at the Sb sites in CeOs 4 Sb 12 has been reported from 121 Sb NMR using an oriented powder sample [37].…”

Section: Vzzmentioning

confidence: 94%

Suppression of ferromagnetic spin fluctuations in the filled skutterudite superconductor SrOs4As12 revealed by As75

et al. 2019

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Motivated by the recent observation of ferromagnetic spin correlations in the filled skutterudite SrFe4As12 [Ding et al. Phys. Rev. B 98, 155149 (2018)], we have carried out 75 As nuclear magnetic resonance (NMR) and nuclear quadrupole resonance (NQR) measurements to investigate the role of magnetic fluctuations in a newly discovered isostructural superconductor SrOs4As12 with a superconducting transition temperature of Tc ∼ 4.8 K. Knight shift K determined by the NQR spectrum under a small magnetic field (≤ 0.5 T) is nearly independent of temperature, consistent with the temperature dependence of the magnetic susceptibility. The nuclear spin-lattice relaxation rate divided by temperature, 1/T1T , is nearly independent of temperature above ∼ 50 K and increases slightly with decreasing temperature below the temperature. The temperature dependence is reasonably explained by a simple model where a flat band structure with a small ledge near the Fermi energy is assumed. By comparing the present NMR data with those in SrFe4As12, we found that the values of |K| and 1/T1T in SrOs4As12 are smaller than those in SrFe4As12, indicating no obvious ferromagnetic spin correlations in SrOs4As12. From the temperature dependence of 1/T1 in the superconducting state, an s-wave superconductivity is realized.PACS numbers:

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“…Then we simplify the problem by introducing symmetry operations S1k at the Pr site which transforms the site 1 to the site k. S1k can be a rotation (3) around ⟨111⟩, rotoinversion (4) around ⟨001⟩, mirror (m) with respect to {110}, or a combination of them. Then, V̂L(k) for the kth site is given by , (6) and we need νQ, η, and RCQ(1) to calculate the resonance frequencies.…”

Section: Details Of Spectral Analysismentioning

confidence: 99%

“…To study phenomena related to higher-order multipoles, single crystal nuclear magnetic resonance (NMR) and nuclear quadrupole resonance (NQR) measurements are important because the local fields acting on nuclei give microscopic information of multipoles and c-f hybridizations at the ligand position [3,4,5,6]. However, the NMR spectral analysis is difficult as the anisotropic hyperfine and electric quadrupole interactions split ligand sites under the magnetic field, even if we use a single crystal sample.…”

Section: Introductionmentioning

confidence: 99%

²⁷Al-NMR/NQR Spectral Analysis of Single Crystal PrTa₂Al₂₀

Kubo

Tou

Miyake

et al. 2020

Proceedings of the International Conference on Strongly Correlated Electron Systems (SCES2019)

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We report the results and analysis of 27 Al nuclear magnetic resonance (NMR) and nuclear quadrupole resonance (NQR) measurements. NMR measurements were performed at the magnetic field parallel to ⟨111⟩ between 5 and 12 T. NQR measurements were performed at 4.2 K. Although the signals from the Al 16c site could not be deconvoluted, the 27 Al-NMR signals are assigned and electric field gradient (EFG) parameters are extracted for both the Al 48f and 96g sites. The obtained NQR parameters are νQ(48f) = 2.418±0.002 MHz, η(48f) = 0.175±0.005, νQ(96g) = 1.00±0.01 MHz, and η(96g) = 0.40±0.05. The EFG directions at the Al 48f site are determined to be VZZ ∥ ⟨110⟩ and VXX ∥ ⟨100⟩. For the Al 96g site, VZZ ∥ ⟨110⟩ and VXX tilts by 14°±3° from ⟨110⟩ to ⟨001⟩.

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Possible Mass Enhancement by Multipole Fluctuations Excited via the Singlet–Triplet Crystal Electric Field States in PrOs₄Sb₁₂: Sb-NMR Studies Using a Single Crystal

Cited by 17 publications

References 68 publications

Atomic dynamics of low-lying rare-earth guest modes in heavy fermion filled skutteruditesROs4Sb12(
Tsutsui
¹
,
Uchiyama
²
,
Sutter
³

et al. 2012
Phys. Rev. B
Self Cite
27
2
10
0
View full text Add to dashboard Cite

Atomic dynamics of low-lying rare-earth guest modes in heavy fermion filled skutteruditesROs4Sb12(
Tsutsui
¹
,
Uchiyama
²
,
Sutter
³

et al. 2012
Phys. Rev. B
Self Cite
27
2
10
0
View full text Add to dashboard Cite

Suppression of ferromagnetic spin fluctuations in the filled skutterudite superconductor SrOs4As12 revealed by As75

²⁷Al-NMR/NQR Spectral Analysis of Single Crystal PrTa₂Al₂₀

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Possible Mass Enhancement by Multipole Fluctuations Excited via the Singlet–Triplet Crystal Electric Field States in PrOs4Sb12: Sb-NMR Studies Using a Single Crystal

Cited by 17 publications

References 68 publications

Atomic dynamics of low-lying rare-earth guest modes in heavy fermion filled skutteruditesROs4Sb12(Tsutsui1, Uchiyama2, Sutter3 et al. 2012Phys. Rev. BSelf Cite272100View full textAdd to dashboardCite

Atomic dynamics of low-lying rare-earth guest modes in heavy fermion filled skutteruditesROs4Sb12(Tsutsui1, Uchiyama2, Sutter3 et al. 2012Phys. Rev. BSelf Cite272100View full textAdd to dashboardCite

Suppression of ferromagnetic spin fluctuations in the filled skutterudite superconductor SrOs4As12 revealed by As75

27Al-NMR/NQR Spectral Analysis of Single Crystal PrTa2Al20

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Possible Mass Enhancement by Multipole Fluctuations Excited via the Singlet–Triplet Crystal Electric Field States in PrOs₄Sb₁₂: Sb-NMR Studies Using a Single Crystal

Atomic dynamics of low-lying rare-earth guest modes in heavy fermion filled skutteruditesROs4Sb12(
Tsutsui
¹
,
Uchiyama
²
,
Sutter
³

et al. 2012
Phys. Rev. B
Self Cite
27
2
10
0
View full text Add to dashboard Cite

Atomic dynamics of low-lying rare-earth guest modes in heavy fermion filled skutteruditesROs4Sb12(
Tsutsui
¹
,
Uchiyama
²
,
Sutter
³

et al. 2012
Phys. Rev. B
Self Cite
27
2
10
0
View full text Add to dashboard Cite

²⁷Al-NMR/NQR Spectral Analysis of Single Crystal PrTa₂Al₂₀