Low-Temperature Magnetization Study on the non-Kramers Cubic System Pr3Pd20Ge6

Arima, Hiroshi; Nogami, Atsushi; Tenya, Kenichi; Yokoyama, Makoto; Miyazaki, Shinta; Sakakibara, Toshiro; Nakayama, M.; Kimura, Noriaki; Aoki, Haruyoshi; Komatsubara, T.

doi:10.1143/jpsjs.71s.124

Cited by 2 publications

(4 citation statements)

References 10 publications

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“…We confirmed that the magnetic susceptibility showed no sign of magnetic ordering at the AFQ ordering temperature, T Q1 = 250 mK. These results are consistent with the previous dc susceptibility measurements reported by Amitsuka et al [25]. The lines displayed in Fig.…”

supporting

confidence: 93%

“…The analysis of elastic constants indicated that the minima at T Q1 and T Q2 were ascribed to the AFQ ordering of the 3 doublet at the 8c site and the FQ ordering of the 5 triplet at the 4a site, respectively. However, the dc magnetic susceptibility of Pr 3 Pd 20 Ge 6 shows no anomaly down to 80 mK [25]. The magnetic property of the 5 triplet ground state at the 4a site with rattling motions is an open question.…”

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confidence: 99%

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Magnetic ordering of hyperfine-coupled nuclear and4f-electron moments in the clathrate compoundPr3Pd20Ge6
Iwakami
¹
,
Namisashi
²
,
Abe
³

et al. 2014
Phys. Rev. B
3
0
1
0
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Complex ac susceptibility, χ = χ − iχ , measurements of the clathrate compound Pr 3 Pd 20 Ge 6 were performed in static fields up to 10 mT for H [001] and at temperatures down to 500 μK. Praseodymium (Pr) nuclear magnetic moments at the 8c site, where quadrupole moments of 4f electrons order at T Q1 = 250 mK, were found to order antiferromagnetically at 9 mK, as shown by a peak in χ and a substantial increase in thermal relaxation time. The large enhancement factor (1 + K 8c ) obtained by calculation of the hyperfine-enhanced nuclear susceptibility of Pr at the 8c site accounts for the high transition temperature of Pr nuclear magnetic moments and the large χ below 30 mK. From analysis of the crystalline electric field and the mean-field approximation, we conclude that a χ peak at 77 mK can be ascribed to an antiferromagnetic ordering of magnetic moments of 4f electrons at the 4a site. We found that nuclear and f-electron moments order separately on two sublattices in this compound. The temperature and magnetic field dependence of χ and χ between 30 and 60 mK are discussed in terms of dissipation phenomena.

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supporting

confidence: 93%

mentioning

confidence: 99%

Magnetic ordering of hyperfine-coupled nuclear and4f-electron moments in the clathrate compoundPr3Pd20Ge6
Iwakami
¹
,
Namisashi
²
,
Abe
³

et al. 2014
Phys. Rev. B
3
0
1
0
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“…This result indicates that the phase transition at T Q1 ¼ 0:25 K is the quadrupole ordering related to the nonmagnetic doublet À 3 at the 8c site. 19) Furthermore, the negative coupling constant g 0 À 3 ½8c for the 8c site suggests that the transition at T Q1 corresponds to the À 3 -type AFQ ordering.…”

Section: Quadrupole Susceptibilitymentioning

confidence: 99%

“…6) The magnetic susceptibility of Pr 3 Pd 20 Ge 6 , however, follows the Curie-Weiss law from 300 to 80 mK. 18,19) Previous ultrasonic measurements on Pr 3 Pd 20 Ge 6 showed a pronounced softening in the elastic constant C 44 down to 0.4 K, which is described in terms of the quadrupole susceptibility for the À 5 ground state system. 20) These experimental results imply that the magnetic À 5 triplet is a ground state for the CEF level scheme at the 4a site.…”

Section: Introductionmentioning

confidence: 96%

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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Low-Temperature Magnetization Study on the non-Kramers Cubic System Pr₃Pd₂₀Ge₆

Cited by 2 publications

References 10 publications

Magnetic ordering of hyperfine-coupled nuclear and4f-electron moments in the clathrate compoundPr3Pd20Ge6
Iwakami
¹
,
Namisashi
²
,
Abe
³

et al. 2014
Phys. Rev. B
3
0
1
0
View full text Add to dashboard Cite

Magnetic ordering of hyperfine-coupled nuclear and4f-electron moments in the clathrate compoundPr3Pd20Ge6
Iwakami
¹
,
Namisashi
²
,
Abe
³

et al. 2014
Phys. Rev. B
3
0
1
0
View full text Add to dashboard Cite

Quadrupole Ordering and Rattling Motion of Clathrate Compound Pr₃Pd₂₀Ge₆

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Low-Temperature Magnetization Study on the non-Kramers Cubic System Pr3Pd20Ge6

Cited by 2 publications

References 10 publications

Magnetic ordering of hyperfine-coupled nuclear and4f-electron moments in the clathrate compoundPr3Pd20Ge6Iwakami1, Namisashi2, Abe3 et al. 2014Phys. Rev. B3010View full textAdd to dashboardCite

Magnetic ordering of hyperfine-coupled nuclear and4f-electron moments in the clathrate compoundPr3Pd20Ge6Iwakami1, Namisashi2, Abe3 et al. 2014Phys. Rev. B3010View full textAdd to dashboardCite

Quadrupole Ordering and Rattling Motion of Clathrate Compound Pr3Pd20Ge6

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Low-Temperature Magnetization Study on the non-Kramers Cubic System Pr₃Pd₂₀Ge₆

Magnetic ordering of hyperfine-coupled nuclear and4f-electron moments in the clathrate compoundPr3Pd20Ge6
Iwakami
¹
,
Namisashi
²
,
Abe
³

et al. 2014
Phys. Rev. B
3
0
1
0
View full text Add to dashboard Cite

Magnetic ordering of hyperfine-coupled nuclear and4f-electron moments in the clathrate compoundPr3Pd20Ge6
Iwakami
¹
,
Namisashi
²
,
Abe
³

et al. 2014
Phys. Rev. B
3
0
1
0
View full text Add to dashboard Cite

Quadrupole Ordering and Rattling Motion of Clathrate Compound Pr₃Pd₂₀Ge₆