Download Alkali-Doped Fullerides: Narrow-Band Solids with Unusual by Olle Gunnarsson PDF

By Olle Gunnarsson

Alkali-doped fullerides have attracted powerful curiosity on account that their construction grew to become attainable approximately fifteen years in the past. This publication offers contemporary paintings which could remedy interesting difficulties coming up from various awesome homes. for instance, those solids are superconductors with excessive transition temperatures, even if the similarity among the digital and phonon power scales may still suppress superconductivity. furthermore, the Ioffe–Regel situation for electric conductivity is strongly violated. The booklet exhibits why superconductivity is however attainable, due to an area pairing mechanism. The Ioffe–Regel is derived quantum-mechanically, and it really is defined why the underlying assumptions are violated for fullerides and high-Tc cuprates, for instance. The publication treats digital and delivery houses, reviewing theoretical and experimental effects. It makes a speciality of superconductivity, electric conductivity and metal–insulator transitions, emphasizing the electron–electron and electron–phonon interactions in addition to the Jahn–Teller impression.

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34)] or electron-phonon interaction [Eq. 36)] terms in the Hamiltonian. All these terms do not change the number of electrons on a given site, and therefore they commute with P ' 1 ' . 2 Nonzero matrix elements d / for transitions between t\u and t\q orbitals mm * in units of A. Comp. gives the vector component (x, y or z) of d and Orient, gives the orientation of the molecule (x or y). tm (m) 2 3 1 3 1 2 1 3 2 3 1 2 hg (m) 3 2 3 1 2 1 3 1 3 2 2 1 Comp. Orient. 77 We next consider the commutator with P ' 2 ' .

The remaining 240 electrons provide a background dielectric function, but are otherwise not involved in an essential way, due to the much higher energies needed for exciting these 240 electrons into higher unoccupied bands. This structure is not seen for RbgCeo, for which the t\u band is filled and no oscillations are possible. Electron-plasmon 0 5 10 coupling 15 20 25 30 E N E R G Y (eV) 37 35 40 Fig. 1 A - 1 . The figure illustrates a a + n plasmon at about 25-27 eV and a TT plasmon at about 8 eV (after Sohmen and Fink 1 1 8 ).

8) destroys a Eu phonon with the quantum numbers v and M and i>\ma creates a t\g electron. 4 Electron-plasmon coupling Fig. 12 shows the electron energy loss spectrum -Im l/e(w,q) as a function of energy for Ceo-118 The spectrum has a very pronounced peak at about 25-27 eV. This corresponds to a collective oscillation involving all 240 electrons, referred to as a a + IT plasmon. At about 8 eV there is a second collective excitation corresponding to a 7r plasmon, where primarily the 60 7r electrons are involved.

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