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

By Olle Gunnarsson

Alkali-doped fullerides have attracted robust curiosity because their construction turned attainable approximately fifteen years in the past. This e-book provides contemporary paintings which could remedy interesting difficulties coming up from numerous awesome houses. for instance, those solids are superconductors with excessive transition temperatures, even if the similarity among the digital and phonon strength scales may still suppress superconductivity. furthermore, the Ioffe–Regel situation for electric conductivity is strongly violated. The e-book indicates why superconductivity is however attainable, due to an area pairing mechanism. The Ioffe–Regel situation is derived quantum-mechanically, and it's defined why the underlying assumptions are violated for fullerides and high-Tc cuprates, for instance. The ebook treats digital and delivery homes, 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.

Show description

Read Online or Download Alkali-Doped Fullerides: Narrow-Band Solids with Unusual Properties PDF

Best atomic & nuclear physics books

Quarks Leptons and the Big Bang

Quarks, Leptons and the massive Bang, 3rd variation, is a transparent, readable and self-contained advent to particle physics and similar components of cosmology. It bridges the distance among non-technical well known debts and textbooks for complex scholars. The publication concentrates on featuring the topic from the trendy point of view of quarks, leptons and the forces among them.

Atomic Spectra and Radiative Transitions

Atomic Spectra and Radiative Transitions covers the systematics of atomic spectra, non-stop spectrum radiation, and the excitation of atoms. This moment version has extra chapters on relativistic corrections within the spectra of hugely charged ions, which rounds off the former therapy. vast tables of oscillator strengths (both dipole and quadrupole), possibilities and move sections of radiative transitions whole this textbook, making it important additionally as a reference paintings.

Festkörperphysik

Zero. Einleitung. - 1. Starres Gitter. - 1. 1. Kristallographische Grundlagen. - 1. 1. 1. Punktgitter. - 1. 1. 2. Kristallgitter. - 1. 2. Beugung von Strahlung an Kristallgittern. - 1. 2. 1. Beugung von Röntgenstrahlen. - 1. 2. 2. Beugung von Korpuskularstrahlung. - 1. three. Bindung im Festkörper. - 1. four. Gitterstörungen.

Brownian movement and molecular reality

Early experiences by way of Einstein and Perrin supplied a few of the first proof for the lifestyles of molecules. Perrin, a Nobel Laureate, wrote this vintage to provide an explanation for his measurements of displaced debris of a resin suspended in water. It brought the concept that of Avogadro's quantity, besides different groundbreaking paintings.

Additional resources for Alkali-Doped Fullerides: Narrow-Band Solids with Unusual Properties

Sample text

11 Schematic representation of various phonons in A 3 C 6 o compounds. The figure shows, from left to right, (a) librations, (b) intermolecular C 6 o-C 6 o phonons, (c) AC6o phonons and (d)-(e) intramolecular H 9 modes. The figure indicates the radial and tangential character of the low-lying and and high-lying H 9 modes, respectively (After Hebard 1 1 1 ). correspondingly. The multiplet effects are often neglected, because they cause a substantial complication of the calculations. The estimates above suggest, however, that these effects are important.

The result is an effective contribution to the hopping between molecules. Thus there is a contribution to the hopping between the mth t\u orbital on the molecule at Ri and the m th orbital on the molecule at Rj E t- • tima £ tlu jm a _ £ /n -IQ\ S where the sum is over the alkali atoms closest to the two Ceo molecules, and tima is the hopping matrix element between the t\u orbital m on the molecule at Ri and the s-orbital on the alkali atom a. 79 Fig. 7 compares this tight-binding calculation with the full LDA band structure calculation.

7 eV. 3 eV. 25). 25), the two electrons in C^Q" adjust to have minimum interaction. 25), which should also be appropriate for the doped case. 1 Coulomb interaction interaction 27 in solid Ceo Theoretical estimates Above we considered a free molecule. We now turn to a Ceo solid. In this case U is strongly screened by the polarization of the surrounding molecules. ,90 and insert the Ceo molecules in an fee lattice and assign a polarizability a to each molecule. An electron is added to the central molecule, and the surrounding molecules are allowed to be polarized in a self-consistent way, both by the electron on the central molecule and by the polarization of the molecules themselves.

Download PDF sample

Rated 4.68 of 5 – based on 26 votes