Spin fluctuations in the skutterudite compound LaFe4Sb12

Viennois, R.; Charar, S.; Ravot, D.; Haen, P.; Mauger, A.; Bentien, Anders; Paschen, S.; Steglich, F.

doi:10.1140/epjb/e2005-00250-0

Cited by 44 publications

(44 citation statements)

References 56 publications

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“…We note that these two values are significantly higher than for most of the thermoelectric materials and even than for Zn 4 Sb 3 for which Caillat et al found Γ = 1.57 [2] (in a recent work an even smaller value (Γ = 1.35) has been found [64]). In the case of filled skutterudites such as RFe 4 Sb 12 that have roughly the same lattice thermal conductivity than ZnSb above 300 K, we have found previously Γ = 1.5 for the lattice Grüneisen parameter close to room temperature [68].…”

Section: Asmentioning

confidence: 61%

Physical properties of thermoelectric zinc antimonide using first-principles calculations

et al. 2012

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Abstract:We report first principles calculations of the structural, electronic, elastic and vibrational properties of the semiconducting orthorhombic ZnSb compound. We study also the intrinsic point defects in order to eventually improve the thermoelectric properties of this already very promising thermoelectric material.Concerning the electronic properties, in addition to the band structure, we show that the Zn (Sb) crystallographically equivalent atoms are not exactly equivalent from the electronic point of view. Lattice dynamics, elastic and thermodynamic properties are found to be in good agreement with the experiments and they confirm the non equivalency of the zinc and antimony atoms from the vibrational point of view. The calculated elastic properties show a relatively weak anisotropy and the hardest direction is the y direction. We observe the presence of low energy modes involving both Zn and Sb atoms at about 5-6 meV, similarly to what has been found in Zn 4 Sb 3 and we suggest that the interactions of these modes with acoustic phonons could explain the relatively low thermal conductivity of ZnSb. Zinc vacancies are the most stable defects and this explains the intrinsic p-type conductivity of ZnSb.

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Section: Asmentioning

confidence: 61%

Physical properties of thermoelectric zinc antimonide using first-principles calculations

et al. 2012

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“…There are, however, also indications for the presence of ferromagnetic spin fluctuations. 39,42,43 The Curie temperature of polycrystalline NaFe 4 Sb 12 increases approximately linearly with pressure ͑at 1.42 GPa by +4.2 K͒ with a rate of Ϸ3 K/ GPa, i.e., by +3.7% / GPa. Also, an increase of the coercive field at 1.8 K by Ϸ20% and upturn of M͑H͒ for temperatures below Ϸ15 K was observed at low temperatures and maximum applied pressure ͑1.42 GPa͒.…”

Section: B Paramagnetic Moment Of the [Fe 4 Sb 12 ] Polyanionmentioning

confidence: 97%

Magnetic, thermal, and electronic properties of iron-antimony filled skutteruditesMFe4Sb12(M=
Schnelle
¹
,
Leithe‐Jasper
²
,
Rösner
³

et al. 2008
Phys. Rev. B
97
11
54
0
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The magnetic susceptibility, field-dependent heat capacity, and electrical transport properties ͑resistivity and Hall effect͒ are investigated for filled skutterudites MFe 4 Sb 12 with M = Na, K, Ca, Sr, Ba, Yb, and La. is paramagnetic with predominantly antiferromagnetic fluctuations. The decrease of the low-temperature specific heat with magnetic field is investigated. A large positive magnetoresistance is observed for both ferromagnetic and nearly ferromagnetic compounds, while that of the La compound is small. Size and temperature dependence of the Hall coefficient points to a compensation of hole and electron carriers. The temperature dependence of the resistivity displays different characteristic power laws and an anomaly around 80 K. These observations can be explained by details of the electronic structure. A systematic variation of the properties with charge transfer from the cation M to the ͓Fe 4 Sb 12 ͔ polyanion is recognized.

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“…4,5 Most of the Ce-based skutterudites show the semiconducting behavior, whereas Ce-based antimonides CeFe 4 Sb 12 and CeRu 4 Sb 12 are semi-metallic exhibiting a non-Fermi liquid behavior. [6][7][8] Pr-based skutterudites are particularly interesting in which a hybridization and multipoleinteraction of 4f -electrons are believed to play an important role for the anomalous properties.…”

Section: Introductionmentioning

confidence: 99%

de Haas–van Alphen Study of the Pr-based Filled Skutterudite PrOs₄P₁₂

et al. 2008

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We have succeeded in observing the de Haas-van Alphen effect in PrOs4P12 which shows no anomaly down to 50 mK in contrast to PrFe4P12 and PrRu4P12. The Fermi surface (FS) topology is reasonably explained by the energy band structure calculation based on a full potential linearized augmented-plane-wave method within the local-density-approximation. Whereas the localized nature of 4f -electrons, we have confirmed a highly enhanced cyclotron effective mass up to 18m0 in PrOs4P12, which is enhanced 3.8 times compared to that of LaOs4P12. No nesting property with q = (1, 0, 0) in the FS of PrOs4P12 has been confirmed, which suggests both the 4f -electron's contribution and the FS nesting property play the role for the phase transitions in PrFe4P12 and PrRu4P12.

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Spin fluctuations in the skutterudite compound LaFe4Sb12

Cited by 44 publications

References 56 publications

Physical properties of thermoelectric zinc antimonide using first-principles calculations

Physical properties of thermoelectric zinc antimonide using first-principles calculations

Magnetic, thermal, and electronic properties of iron-antimony filled skutteruditesMFe4Sb12(M=
Schnelle
¹
,
Leithe‐Jasper
²
,
Rösner
³

et al. 2008
Phys. Rev. B
97
11
54
0
View full text Add to dashboard Cite

de Haas–van Alphen Study of the Pr-based Filled Skutterudite PrOs₄P₁₂

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Spin fluctuations in the skutterudite compound LaFe4Sb12

Cited by 44 publications

References 56 publications

Physical properties of thermoelectric zinc antimonide using first-principles calculations

Physical properties of thermoelectric zinc antimonide using first-principles calculations

Magnetic, thermal, and electronic properties of iron-antimony filled skutteruditesMFe4Sb12(M=Schnelle1, Leithe‐Jasper2, Rösner3 et al. 2008Phys. Rev. B9711540View full textAdd to dashboardCite

de Haas–van Alphen Study of the Pr-based Filled Skutterudite PrOs4P12

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About

Magnetic, thermal, and electronic properties of iron-antimony filled skutteruditesMFe4Sb12(M=
Schnelle
¹
,
Leithe‐Jasper
²
,
Rösner
³

et al. 2008
Phys. Rev. B
97
11
54
0
View full text Add to dashboard Cite

de Haas–van Alphen Study of the Pr-based Filled Skutterudite PrOs₄P₁₂