Electrical transport in Na, K, Rb, and Cs fullerides: Phase formation, microstructure, and metallicity

Stepniak, F.; Benning, P. J.; Poirier, D. M.; Weaver, J. H.

doi:10.1103/physrevb.48.1899

Cited by 96 publications

(37 citation statements)

References 47 publications

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“…The electrical resistivity ρ approaches a minimum at x = 3, where it reaches typical values of high resistivity metals [167,168]. The low electrical conductivity can be explained by the relatively weak overlap of the electron wavefunctions between the adjacent C 3− 60 ions and by the merohedral disorder in the alignment of adjacent C 3− 60 ions.…”

Section: (4b) Normal State Propertiesmentioning

confidence: 98%

Solid State and Magnetic Properties of Pure, Intercalated and Superconducting Fullerenes

Buntar¹,

Sauerzopf²,

Weber³

1997

Aust. J. Phys.

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A review of some of the solid state and the magnetic properties of fullerenes is presented. We summarise and discuss experimental results on magnetism of pure C60, C70 and higher fullerenes. The main features of the structure and the magnetic properties of intercalated fullerenes, such as metallofullerenes, TDAE-C60 and polymeric A1C60, are presented. Attention is also paid to the mixed state properties of fullerene superconductors, especially to the evaluation of the critical fields and the characteristic lengths of these materials. Some new experimental results on this subject are also presented.

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Section: (4b) Normal State Propertiesmentioning

confidence: 98%

Solid State and Magnetic Properties of Pure, Intercalated and Superconducting Fullerenes

Buntar¹,

Sauerzopf²,

Weber³

1997

Aust. J. Phys.

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“…In Fig. 2 [26][27][28] while there is a metallic and even superconductivity character in 3 negatively charged fullerenes [29][30][31]. Despite this knowledge a full understanding of metallic behavior of fullerides is still lacking.…”

Section: Resultsmentioning

confidence: 99%

Multiconfigurational Study of the Electronic Structure of Negatively Charged Fullerens

Naderi¹,

Veryazov²

2017

JCCE

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Multiconfigurational second order perturbation theory was employed in order to describe the ground and excited states of . Different choices of the active spaces are discussed and the possibility to apply multiconfigurational theory to study is investigated. The calculations were performed for all possible spin states (for selected charge) and show the preference of low spin state. The energy difference between twoand pairs -and -shows that the probability to create a charge alternation in fullerides is small.

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“…Stepniak et al have reported that the thin film samples of Rb x C 60 can be described within the framework of granular metal theory. 28 The sample Sm 6 C 60 shows a weak localization behavior at low temperature and the ratio ρ(4.2K)/ρ(290K) is only 1.7. In addition, the transport at low temperature can be explained by the granular metal theory.…”

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confidence: 95%

Structure and properties of a fullerideSm6C60

Chen

Liu

et al. 1999

Phys. Rev. B

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A novel fulleride Sm 6 C 60 has been synthesized using high temperature solid state reaction. The Rietveld refinement on high resolution synchrotron Xray powder diffraction data shows that Sm 6 C 60 is isostructural with bodycentered cubic A 6 C 60 (A=K, Ba). Raman spectrum of Sm 6 C 60 is similar to that of Ba 6 C 60 , and the frequencies of two A g modes in Sm 6 C 60 are nearly the same as that of Ba 6 C 60 , suggesting that Sm is divalent and hybridization between C 60 molecules and the Sm atom could exist in Sm 6 C 60 . Resistivity measurement shows a weak T-linear behavior above 180 K, the transport at low temperature is mainly dominated by granular-metal theory.PACS numbers: 71.20. Tx, 67.57.Hi Alkali intercalation into the C 60 host lattice is a successful technique for synthesizing new fullerides.1 Hereafter, an extensive research has been concentrated on the intercalation of a wide variety of atoms or molecules in the C 60 solids. Intercalation of alkali metals in the C 60 solids yields various structural compounds A x C 60 (x=1, 3, 4, 6) with different physical property.2-6 Among these, the superconducting compounds, A 3 C 60 , has attracted considerable interest.3 In this system, the fcc lattice parameter and band filling are tunable by changing the intercalants, T c goes up with increasing lattice parameter, 7 while it rapidly decreases when the nominal valence ( n ) shifts from the half-filling n=3 of t 1u band. 8The study was then extended to the alkali-earth series of AE x C 60 , 9-12 the electrons are introduced by intercalation of alkali-earth metals into the next lowest unoccupied molecular orbital with t 1g symmetry. The superconducting compounds with various structures and critical temperatures were prepared (Ca 5 C 60 , Ba 4 C 60 , Sr 4 C 60 ).9,13 Such tolerance for the C 60 molecular valence in t 1g superconductors makes a striking contrast with the strict constraint for the valence state in the case of t 1u superconductors.The rare-earth metals were also intercalated into the C 60 solids, but only one phase RE 2.75 C 60 (RE=Yb, Sm) was discovered so far.14,15 In this system, the basic structure of 1

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Electrical transport in Na, K, Rb, and Cs fullerides: Phase formation, microstructure, and metallicity

Cited by 96 publications

References 47 publications

Solid State and Magnetic Properties of Pure, Intercalated and Superconducting Fullerenes

Solid State and Magnetic Properties of Pure, Intercalated and Superconducting Fullerenes

Multiconfigurational Study of the Electronic Structure of Negatively Charged Fullerens

Structure and properties of a fullerideSm6C60

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