Strongly correlated electron phenomena in Pr-based filled skutterudite compounds

Maple, M. B.; Henkie, Z.; Yuhasz, W. M.; Ho, P. C.; Yanagisawa, Tatsuya; Sayles, T. A.; Butch, Nicholas P.; Jeffries, J. R.; Pietraszko, A.

doi:10.1016/j.jmmm.2006.10.508

Cited by 54 publications

(36 citation statements)

References 48 publications

(97 reference statements)

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“…The rate of decrease of the superconducting transition temperature T c with Nd concentration is nearly the same in the (Pr 1−x Nd x )Os 4 Sb 12 and Pr(Os 1−y Ru y ) 4 Sb 12 alloy systems [8], contrary to the behavior of "conventional" superconductors where magnetic impurities are much more effective than nonmagnetic ones in suppressing T c . There is evidence that Nd substitution does not affect the Pr 3+ CEF splitting nearly as strongly as Ru doping [6].…”

Section: Introductionmentioning

confidence: 97%

“…An example is the filled skutterudite family of isostructural lanthanide intermetallics [1], where the unconventional heavy-fermion superconductor PrOs 4 Sb 12 and its alloys have been the subject of considerable interest [2,3]. The isomorph NdOs 4 Sb 12 is a ferromagnet with Curie temperature T C ≃ 0.8 K [4][5][6]. In order to elucidate the interplay between the superconductivity of PrOs 4 Sb 12 and the ferromagnetism of NdOs 4 Sb 12 , the alloy system Pr 1−x Nd x Os 4 Sb 12 has been investigated.…”

Section: Introductionmentioning

confidence: 99%

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Muon spin rotation and relaxation inPr1−xNdxOs4
MacLaughlin
¹
,
Ho
²
,
Shu
³

et al. 2014
Phys. Rev. B
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Muon spin rotation and relaxation (µSR) experiments have been carried out to characterize magnetic and superconducting ground states in the Pr1−xNdxOs4Sb12 alloy series. In the ferromagnetic end compound NdOs4Sb12 the spontaneous local field at positive-muon (µ + ) sites below the ordering temperature TC is greater than expected from dipolar coupling to ferromagnetically aligned Nd 3+ moments, indicating an additional indirect RKKY-like transferred hyperfine mechanism. For 0.45 ≤ x ≤ 0.75, µ + spin relaxation rates in zero and weak longitudinal applied fields indicate that static fields at µ + sites below TC are reduced and strongly disordered. We argue this is unlikely to be due to reduction of Nd 3+ moments, and speculate that the Nd 3+ -µ + interaction is suppressed and disordered by Pr doping. In an x = 0.25 sample, which is superconducting below Tc = 1.3 K, there is no sign of "spin freezing" (static Nd 3+ magnetism), ordered or disordered, down to 25 mK. Dynamic µ + spin relaxation is strong, indicating significant Nd-moment fluctuations. The µ + diamagnetic frequency shift and spin relaxation in the superconducting vortex-lattice phase decrease slowly below Tc, suggesting pair breaking and/or possible modification of Fermi-liquid renormalization by Nd spin fluctuations. For 0.25 ≤ x ≤ 0.75, the µSR data provide evidence against phase separation; superconductivity and Nd 3+ magnetism coexist on the atomic scale.

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Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Muon spin rotation and relaxation inPr1−xNdxOs4
MacLaughlin
¹
,
Ho
²
,
Shu
³

et al. 2014
Phys. Rev. B
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“…[2][3][4][5] These compounds crystallize in the cubic Im3 space group, and are characterized by a large unit cell which includes icosahedral pnictogen (X) cages that surround the Ln ions. The crystal structure is shown in Fig.…”

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confidence: 99%

Unusual local disorder in NdOs4Sb12and PrOs4Sb
Keiber
¹
,
Bridges
²
,
Baumbach
³

et al. 2012
Phys. Rev. B
16
3
17
0
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We present a temperature-dependent, extended x-ray absorption fine structure (EXAFS) analysis of the filled skutterudite compounds NdOs4Sb12, PrOs4Sb12 and EuOs4Sb12. Although the interpretation of recent ultrasonic measurements suggested off-center displacements for Nd and Pr in NdOs4Sb12 and PrOs4Sb12, the EXAFS analysis shows that the Nd-Sb, Pr-Sb, and Sb-Sb peaks are well ordered. Surprisingly however, the second neighbor Nd-Os and Pr-Os peaks are highly disordered, even at low temperatures, and the Os-Os peak also has some disorder in the Nd and Pr systems. In contrast to the anomalous results for the Pr and Nd samples, neither the Eu-Sb, Eu-Os, nor the Os-Os peak is disordered at low temperature for EuOs4Sb12. For all three systems within estimated errors, the rare earth atom is on-center inside the Sb cage. We propose that for the Nd and Pr compounds, the Os cage distorts, with some of the Os atoms moving either towards or away from the Nd or Pr atoms, such that the Nd-Sb, Pr-Sb and Sb-Sb pair distances have very little disorder. Some possible distortion models are suggested and the possible ramifications for thermoelectric and transport properties are discussed.

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“…Although quite rare in Sm-based systems, the Kondo effect is observed in SmSn 3 and SmFe 4 P 12 as − ln T dependence of the resistivity 4,5 . Recent extensive work on filled skutterudite compounds 6,7 has elucidated that when located at a highly symmetric center of a cage, the Sm ion may induce interesting physical properties. SmRu 4 P 12 shows a metal-insulator transition at T MI = 16.5 K and an octupole order below T MI has been proposed to explain the sharp drop in the elastic constant 8,9 .…”

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confidence: 99%

Strong valence fluctuation effects in SmTr2Al20(Tr=T

Sakai

Nakatsuji

2011

Phys. Rev. B

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Strongly correlated electron phenomena in Pr-based filled skutterudite compounds

Cited by 54 publications

References 48 publications

Muon spin rotation and relaxation inPr1−xNdxOs4
MacLaughlin
¹
,
Ho
²
,
Shu
³

et al. 2014
Phys. Rev. B
Self Cite

Muon spin rotation and relaxation inPr1−xNdxOs4
MacLaughlin
¹
,
Ho
²
,
Shu
³

et al. 2014
Phys. Rev. B
Self Cite

Unusual local disorder in NdOs4Sb12and PrOs4Sb
Keiber
¹
,
Bridges
²
,
Baumbach
³

et al. 2012
Phys. Rev. B
16
3
17
0
View full text Add to dashboard Cite

Strong valence fluctuation effects in SmTr2Al20(Tr=T

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Strongly correlated electron phenomena in Pr-based filled skutterudite compounds

Cited by 54 publications

References 48 publications

Muon spin rotation and relaxation inPr1−xNdxOs4MacLaughlin1, Ho2, Shu3 et al. 2014Phys. Rev. BSelf Cite

Muon spin rotation and relaxation inPr1−xNdxOs4MacLaughlin1, Ho2, Shu3 et al. 2014Phys. Rev. BSelf Cite

Unusual local disorder in NdOs4Sb12and PrOs4SbKeiber1, Bridges2, Baumbach3 et al. 2012Phys. Rev. B163170View full textAdd to dashboardCite

Strong valence fluctuation effects in SmTr2Al20(Tr=T

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Muon spin rotation and relaxation inPr1−xNdxOs4
MacLaughlin
¹
,
Ho
²
,
Shu
³

et al. 2014
Phys. Rev. B
Self Cite

Muon spin rotation and relaxation inPr1−xNdxOs4
MacLaughlin
¹
,
Ho
²
,
Shu
³

et al. 2014
Phys. Rev. B
Self Cite

Unusual local disorder in NdOs4Sb12and PrOs4Sb
Keiber
¹
,
Bridges
²
,
Baumbach
³

et al. 2012
Phys. Rev. B
16
3
17
0
View full text Add to dashboard Cite