L. Mihaly

Single-Crystalline (KC60)n: A Conducting Linear Alkali Fulleride Polymer

Single crystals of a linear cycloadduct conducting polymer, (KC60)n, have been grown that are a few tenths of a millimeter in length. Partial oxidation under toluene transformed these crystals into bundles of fibers. The degree of polymerization exceeded 100,000.

Electronic properties of doped fullerenes

The most abundant fullerene molecule, C60, has just the right combination of size, chemical stability, and activity to serve as the building block for a large variety of solids with fascinating properties. After a short overview of the related carbon compounds, first the structures of the C60 molecule and the pure crystalline C60 are summarized. Experimental and theoretical works on the vibrational and the electronic properties of the molecule and the solid are reviewed. Next, some of the relevant concepts widely used in solid state phyics, like electron-phonon and electron-electron interactions, Hunds rule and Jahn-Teller distortion are discussed in the context of doped fullerides. The structural and electronic instabilities of the conducting C60 compounds are reviewed in detail. Finally, a few open questions are discussed.

Orthorhombic A1C60 : a conducting linear alkali fulleride polymer ?

Abstract We suggest that the orthorhombic phases of the alkali fullerides, o-A 1 C 60 (A=K, Rb, Cs), are linear polyners formed in the solid state at about 400 K by a [2+2] cycloaddition reaction between the fulleride ions of the fcc high temperature phase. The electronic structure of the linear polymers is quasi-one-dimensional.

Beta-amyloid deposition and Alzheimer's type changes induced by Borrelia spirochetes

The pathological hallmarks of Alzheimers disease (AD) consist of beta-amyloid plaques and neurofibrillary tangles in affected brain areas. The processes, which drive this host reaction are unknown. To determine whether an analogous host reaction to that occurring in AD could be induced by infectious agents, we exposed mammalian glial and neuronal cells in vitro to Borrelia burgdorferi spirochetes and to the inflammatory bacterial lipopolysaccharide (LPS). Morphological changes analogous to the amyloid deposits of AD brain were observed following 2-8 weeks of exposure to the spirochetes. Increased levels of beta-amyloid precursor protein (AbetaPP) and hyperphosphorylated tau were also detected by Western blots of extracts of cultured cells that had been treated with spirochetes or LPS. These observations indicate that, by exposure to bacteria or to their toxic products, host responses similar in nature to those observed in AD may be induced.

Observation and assignment of silent and higher-order vibrations in the infrared transmission of C60 crystals.

We report the measurement of infrared transmission of large

INFRARED AND RAMAN EVIDENCE FOR DIMERS AND POLYMERS IN RBC60

{\mathrm{C}}_{60}

Magnetoresistance in La1-xSrxCoO3 for 0.05 <~ x <~ 0.25.

single crystals. The spectra exhibit a very rich structure with over 180 vibratonal absorptions visible in the 100\char21{}4000

Quasiparticle damping in Bi2Sr2CaCu2O8 and Bi2Sr2CuO6.

{\mathrm{cm}}^{\mathrm{\ensuremath{-}}1}

Insulating and conducting phases of RbC60.

range. Many silent modes are observed to have become weakly IR active. We also observe a large number of higher-order combination modes. The temperature (77\char21{}300 K) and pressure (0\char21{}25 kbar) depedences of these modes were measured and are presented. Careful analysis of the IR spectra, in conjuction with Raman scattering data showing second-order modes and neutron scattering data, allows the selection of the 46 vibrational modes of

In situ infrared transmission study of Rb- and K-doped fullerenes

{\mathrm{C}}_{60}