To Speak the Unspeakable

Gelfand, Elissa; Millett, Kate

doi:10.2307/4021793

Cited by 4 publications

(5 citation statements)

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“…also Ref. [5]). These methods are, however, computationally demanding and not particulary transparent, and much of the physical insight is lost in the complexity of mathematics.…”

mentioning

confidence: 82%

Electron–phonon coupling in charged buckminsterfullerene

Breda

Broglia

Roman

et al. 1998

Chemical Physics Letters

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A simple, yet accurate solution of the electron-phonon coupling problem in C 60 is presented. The basic idea behind it is to be found in the parametrization of the ground state electronic density of the system calculated making use of ab-initio methods, in term of sp 2+x hybridized orbitals. This parametrization allows for an economic determination of the deformation potential associated with the fullerene's normal modes. The resulting electron-phonon coupling constants are used to calculate Jahn-Teller effects in C − 60 , and multiple satellite peaks in the corresponding photoemission reaction. Theory provides an accurate account of the experimental findings.

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“…also Ref. [5]). These methods are, however, computationally demanding and not particulary transparent, and much of the physical insight is lost in the complexity of mathematics.…”

mentioning

confidence: 82%

Electron–phonon coupling in charged buckminsterfullerene

Breda

Broglia

Roman

et al. 1998

Chemical Physics Letters

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“…-So far we have considered the case of a rather wide though finite electronic band with full width W = 2.5 eV where W ≫ ω ln and the phonon structures in EDOS have a generic form. However, band structure calculations for one family of the known narrow materials -fulleride compounds -give a much smaller value W = 0.5 eV [25,26]. One expects that in this situation many of the discussed features should be significantly enhanced [13].…”

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confidence: 99%

Observation of phonon structure in electron density of states of a normal metal

Knigavko¹,

Ćarbotte²,

Marsiglio³

2005

Europhys. Lett.

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PACS. 71.10.Ay -Fermi-liquid theory and other phenomenological models. PACS. 71.38.-k -Polarons and electron-phonon interactions. PACS. 79.60.-i -Photoemission and photoelectron spectra.Abstract. -Within standard treatments of the interacting electron-phonon system the electron density of states (EDOS) shows no sign of the phonons when the system is in the normal state. On the other hand, emergence of a fine energy scale in the superconducting state makes the phonons readily observable in the EDOS and other spectroscopic quantities. Here we wish to re-examine the conditions under which phonon structure might be present in the normal state. Accounting for a finite, i.e. non-infinite, electronic bandwidth results in easily distinguishable phonon structure in the EDOS. We argue that for narrow band metals, the resolution of photoemission spectroscopy is sufficient for resolving these structures. Manifestations of finite band effects in K3C60 are discussed.c EDP Sciences

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“…isotope effect measurements [1,2] and others -see Refs. [3], [4], [5] and [6] for reviews), the key experiment, which is single electron tunneling at biases above the gap edge, has not yet been performed [7] to the extent that reproducible structure is observed. In fact, definitive results from single electron tunneling may be very difficult to achieve for two reasons.…”

mentioning

confidence: 99%

“…( 3) does not even follow in the weak coupling limit at finite temperature. With these limitations in mind, we proceed for the remainder of this paper using the explicit equation (3).…”

mentioning

confidence: 99%

Inversion of K3C60 reflectance data

1998

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We outline a procedure for obtaining the electron-phonon spectral density by inversion of optical conductivity data, a process very similar in spirit to the McMillan-Rowell inversion of tunelling data. We assume both electron-impurity (elastic) and electron-phonon (inelastic) scattering processes. This procedure has the advantage that it can be utilized in the normal state. Furthermore, a very good qualitative result can be obtained explicitly, without iteration. We illustrate this technique on recently acquired far-infrared data in K3C60. We show that the electron-phonon interaction is most likely responsible for superconductivity in these materials.

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To Speak the Unspeakable

Cited by 4 publications

References 0 publications

Electron–phonon coupling in charged buckminsterfullerene

Electron–phonon coupling in charged buckminsterfullerene

Observation of phonon structure in electron density of states of a normal metal

Inversion of K3C60 reflectance data

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