Superconductivity of filled skutterudites<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">LaRu</mml:mi></mml:mrow><mml:mrow><mml:mn>4</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">As</mml:mi></mml:mrow><mml:mrow><mml:mn>12</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><

Shirotani, Ichimin; Uchiumi, Takanori; Ohno, Katsushi; Sekine, Chihiro; Nakazawa, Yasuhiro; Kanoda, K.; Todo, Synge; Yagi, T.

doi:10.1103/physrevb.56.7866

Cited by 195 publications

(96 citation statements)

References 18 publications

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“…Because they make very good thermoelectrics 21,22,47 , host unusual metalinsulator transitions [23][24][25] , can be rare-earth magnets, heavyfermion compounds [26][27][28][29][30] , non-Fermi liquids [31][32][33][34][35] , itinerant ferromagnets [36][37][38] and superconductors 27,[39][40][41][42][43][44][45][46] , and have been proposed as topological insulators 48 , filled skutterudites are a very important class of non-molecular solids. Because the electronic and magnetic properties of solids depend critically on the actual atoms making up the compounds in addition to the compound's electron count, expanding the filled skutterudites from primarily group 8 to group 9 metal-based compounds, as we have done in this study, affords the opportunity to observe many new physical properties.…”

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A large family of filled skutterudites stabilized by electron count

et al. 2015

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The Zintl concept is important in solid-state chemistry to explain how some compounds that combine electropositive and main group elements can be stable at formulas that at their simplest level do not make any sense. The electronegative elements in such compounds form a polyatomic electron-accepting molecule inside the solid, a 'polyanion', that fills its available energy states with electrons from the electropositive elements to obey fundamental electroncounting rules. Here we use this concept to discover a large family of filled skutterudites based on the group 9 transition metals Co, Rh, and Ir, the alkali, alkaline-earth, and rare-earth elements, and Sb 4 polyanions. Forty-three new filled skutterudites are reported, with 63 compositional variations-results that can be extended to the synthesis of hundreds of additional new compounds. Many interesting electronic and magnetic properties can be expected in future studies of these new compounds.

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A large family of filled skutterudites stabilized by electron count

et al. 2015

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“…For example, they show metal-insulator (M-I) transitions [1], superconductivity [2,3,4] and large thermoelectric performance [5] depending on the combination of elements. To seek out the origin of this anomalous behavior, one of the important factors that must be understood is the topology of the Fermi surface.…”

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confidence: 99%

“…Lj, 71.30.+h, 75.30.Mb Filled skutterudite compounds RM 4 X 12 (R = rareearth, M = Fe, Ru or Os; X = P, As or Sb) have attracted a great deal of interest in view of the origin of their dramatically variable physical properties. For example, they show metal-insulator (M-I) transitions [1], superconductivity [2,3,4] and large thermoelectric performance [5] depending on the combination of elements. To seek out the origin of this anomalous behavior, one of the important factors that must be understood is the topology of the Fermi surface.…”

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Charge-density-wave ordering in the metal-insulator transition compoundPrRu4P12

et al. 2004

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X-ray and electron diffraction measurements on the metal-insulator (M-I) transition compound PrRu4P12 have revealed the emergence of a periodic ordering of charge density around the Pr atoms. It is found that the ordering is associated with the onset of a low temperature insulator phase. These conclusions are supported by the facts that the space group of the crystal structure transforms from Im3 to Pm3 below the M-I transition temperature and also that the temperature dependence of the superlattice peaks in the insulator phase follows the squared BCS function. The M-I transition could be originated from the perfect nesting of the Fermi surface and/or the instability of the f electrons.PACS numbers: 61.10.-i, 61.14. Lj, 71.30.+h, 75.30.Mb Filled skutterudite compounds RM 4 X 12 (R = rareearth, M = Fe, Ru or Os; X = P, As or Sb) have attracted a great deal of interest in view of the origin of their dramatically variable physical properties. For example, they show metal-insulator (M-I) transitions [1], superconductivity [2,3,4] and large thermoelectric performance [5] depending on the combination of elements. To seek out the origin of this anomalous behavior, one of the important factors that must be understood is the topology of the Fermi surface. According to de Haas-van Alphen measurements, the shape of the Fermi surface in LaFe 4 P 12 is nearly cubic [6]. This implies the presence of nesting instability with a wave vector of q = (1,0,0). It was, thus, conjectured that some of the exotic properties in filled skutterudites originate from the nesting of the Fermi surface. To confirm this hypothesis, an intensive effort has been put. However, no clear evidence of nesting-induced phenomena has been identified so far.The filled skutterudite compound PrRu 4 P 12 , which is a metal at room temperature, has attracted a lot of attention due to interest in the origin of the M-I transition at T MI = 60 K [1]. Compared to other filled skutterudites, which show similar M-I transitions, PrRu 4 P 12 is unique since it has neither a magnetic anomaly at T MI , as seen in TbRu 4 P 12 [7], GdRu 4 P 12 [7], NdFe 4 P 12 [3] and SmRu 4 P 12 [8], nor anti-quadrupolar ordering as observed in PrFe 4 P 12 [9]. On the other hand, a subtle lattice distortion has been detected by electron diffraction measurements, which indicates weak superlattice spots at (h, k, l)(h + k + l = odd) below T MI [10]. To clarify the mechanism of the M-I transition, including the possibility of Fermi surface nesting, the precise crystal structure of the low temperature phase of PrRu 4 P 12 must be identified. To this end, we have carried out crystal structure analysis using electron and x-ray diffraction techniques.Single crystals of PrRu 4 P 12 were grown by a Sn flux method, which is described in detail elsewhere [10]. For electron diffraction measurements, the as-grown crystals were thinned down to 50 µm by mechanical polishing and then ion milled using an argon ion-beam thinning apparatus. For x-ray diffraction measurements, on the other hand, the as-g...

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“…Some of the variety of interesting physical properties displayed by filled skutterudite compound includes superconductivity [1,2], magnetic order [3,4], heavy fermion behaviour [5][6][7][8], non-Fermi liquid behaviour [9] and metal-insulator transition [10]. Heavy fermion superconductivity have been observed in PrOs 4 Sb 12 with an electronic specific heat coefficient γ = 350 mJ/mol·K 2 and a superconducting transition temperature T c = 1.85 K. Hence, PrOs 4 Sb 12 is a superconductor. One of the most important fundamental properties of this compound is its electronic structure.…”

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confidence: 98%

Photoemission study of the electronic structure of praseodymium filled skutterudite (PrOs4Sb12)

Akinlami¹,

Awobode²

2011

Semicond. Phys. Quantum Electron. Optoelectron.

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Abstract. Here we report the electronic structure of praseodymium filled skutterudite compound PrOs 4 Sb 12 . The theoretical photoemission spectrum (PES) at ћω = 21.2 eV shows four distinct structures peaking at about -0.2, -7.7, -13.7 and -18.2 eV. But on increasing the photon energy to 40.8 eV, the peak at -0.2 eV becomes a prominent or pronounced peak, the peak at -7.7 eV decreases in intensity, the peak at -13.7 eV increases intensity, the peak at -18.2 eV reduces in intensity and another peak emerges. These structures are interpreted to be associated with the density-of-states features on the basis of the results of band structure calculation. Hence, the peak at -0.2 eV arises from the symmetry point P at -11.61 eV, the peak at -7.7 eV comes from the symmetry point P at -11.62 eV, the peak at -13.7 eV arises from the symmetry point P at -11.88 eV and the peak at -18.2 eV arises from the symmetry point P at -11.88 eV. The PES energy level difference for PrOs 4 Sb 12 fell within the range -0.5 to -7.5 eV indicating that it can be used in designing electronic devices. The energies of specific electronic states in the band structure of PrOs 4 Sb 12 showed that it could be used for the development of solid-state devices.

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Superconductivity of filled skutteruditesLaRu4As12and<

Cited by 195 publications

References 18 publications

A large family of filled skutterudites stabilized by electron count

A large family of filled skutterudites stabilized by electron count

Charge-density-wave ordering in the metal-insulator transition compoundPrRu4P12

Photoemission study of the electronic structure of praseodymium filled skutterudite (PrOs4Sb12)

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