Optical study of electronic structures and phonons in alkali-metal-doped<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">C</mml:mi></mml:mrow><mml:mrow><mml:mn>60</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>

Iwasa, Yoshihiro; Kaneyasu, T.

doi:10.1103/physrevb.51.3678

Cited by 57 publications

(81 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This would mean that in both orthorhombic and tetragonal crystals, the vibrational levels should show a threefold splitting. This is, however, not what Iwasa and Kaneyasu [4] have observed. At room temperature they saw a twofold splitting.…”

Section: Introductioncontrasting

confidence: 51%

“…Several experimental findings, both in isolated ions in solution [3] and in the solid state [4][5][6], have been explained by a Jahn-Teller distortion. However, the question remains hitherto unanswered how much the external crystal field influences the electronic and vibrational levels and how much the internal degrees of freedom contribute.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Infrared Signatures of the Dynamic Jahn-Teller Effect in Fullerene-Based Materials

Klupp¹

2006

AIP Conference Proceedings

View full text Add to dashboard Cite

Abstract. Temperature-dependent vibrational spectra show the evolution of dynamical Jahn-Teller states in A2C60 and A4C60 fulleride salts. Whereas at low temperature the external field of the cations determines the local symmetry, at high temperature the fullerene balls distort into a T>^ or T>^d symmetry, independent of the surrounding lattice. The average structure is preserved while the molecules show pseudorotation between possible potential minima.

show abstract

Section: Introductioncontrasting

confidence: 51%

Section: Introductionmentioning

confidence: 99%

Infrared Signatures of the Dynamic Jahn-Teller Effect in Fullerene-Based Materials

Klupp¹

2006

AIP Conference Proceedings

View full text Add to dashboard Cite

show abstract

“…Their optical conductivity indeed reveals the absence of the metallic Drude peak [33]. Electron energy loss spectroscopy experiments [34], as those displayed in figure 7 allow to evidence gaps ~0.5eV in the optical spectra.…”

Section: Evenly Charged Compounds: Mott Jahn-teller Insulatorsmentioning

confidence: 89%

“…Alternatively, infrared measurements allowed to detect the symmetry of the vibrational modes in K 4 C 60 [33] [42], and evidenced a change at 250K which could be connected with the electronic structure change seen in 1/T 1 in figure 8, which remains to be understood.…”

Section: -P5mentioning

confidence: 99%

Electronic Correlations, Jahn-Teller Distortions and Mott Transition to Superconductivity in Alkali-C₆₀Compounds

Alloul

2012

EPJ Web of Conferences

View full text Add to dashboard Cite

Abstract. The discovery in 1991 of high temperature superconductivity (SC) in A 3 C 60 compounds, where A is an alkali ion, has been rapidly ascribed to a BCS mechanism, in which the pairing is mediated by on ball optical phonon modes. While this has lead to consider that electronic correlations were not important in these compounds, further studies of various A n C 60 with n=1, 2, 4 allowed to evidence that their electronic properties cannot be explained by a simple progressive band filling of the C 60 six-fold degenerate t 1u molecular level. This could only be ascribed to the simultaneous influence of electron correlations and Jahn-Teller Distortions (JTD) of the C 60 ball, which energetically favour evenly charged C 60 molecules. This is underlined by the recent discovery of two expanded fulleride Cs 3 C 60 isomeric phases which are Mott insulators at ambient pressure. Both phases undergo a pressure induced first order Mott transition to SC with a (p, T) phase diagram displaying a dome shaped SC, a common situation encountered nowadays in correlated electron systems. NMR experiments allowed us to study the magnetic properties of the Mott phases and to evidence clear deviations from BCS expectations near the Mott transition. So, although SC involves an electron-phonon mechanism, the incidence of electron correlations has an importance on the electronic properties, as had been anticipated from DMFT calculations.

show abstract

“…2 Although their results show somewhat different Drude weight and MIR absorption energy from each other, the pronounced suppression of the Drude weight and the accompanying MIR absorption imply strong electronphonon and/or electron-electron interactions in this material.…”

Section: 2mentioning

confidence: 99%

Optical conductivity in normal-state fullerene superconductors

Yoo

Choi

2000

Phys. Rev. B

View full text Add to dashboard Cite

We calculate the optical conductivity () in the normal-state fullerene superconductors by selfconsistently including the impurity scatterings, the electron-phonon, and electron-electron Coulomb interactions. The finite bandwidth of the fullerenes and the vertex corrections are explicitly considered in calculating the renormalized Green's function. () is obtained by calculating the current-current correlation function with the renormalized Green's function in the Matsubara frequency and then performing analytic continuation to the real frequency at finite temperature. The Drude weight in () is strongly suppressed due to the interactions and transfered to the mid-infrared region around and above 0.06 eV, which is somewhat less pronounced and much broader compared with the experimental observation by DeGiorgi et al.

show abstract

Optical study of electronic structures and phonons in alkali-metal-dopedC60

Cited by 57 publications

References 37 publications

Infrared Signatures of the Dynamic Jahn-Teller Effect in Fullerene-Based Materials

Infrared Signatures of the Dynamic Jahn-Teller Effect in Fullerene-Based Materials

Electronic Correlations, Jahn-Teller Distortions and Mott Transition to Superconductivity in Alkali-C₆₀Compounds

Optical conductivity in normal-state fullerene superconductors

Contact Info

Product

Resources

About

Optical study of electronic structures and phonons in alkali-metal-dopedC60

Cited by 57 publications

References 37 publications

Infrared Signatures of the Dynamic Jahn-Teller Effect in Fullerene-Based Materials

Infrared Signatures of the Dynamic Jahn-Teller Effect in Fullerene-Based Materials

Electronic Correlations, Jahn-Teller Distortions and Mott Transition to Superconductivity in Alkali-C60Compounds

Optical conductivity in normal-state fullerene superconductors

Contact Info

Product

Resources

About

Electronic Correlations, Jahn-Teller Distortions and Mott Transition to Superconductivity in Alkali-C₆₀Compounds