Gilbert Albinet

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2014 We calculate the a.c. frequency response of Sierpinski-gasket networks, in which the bonds consist of resistors R (or of impedances Zh) and all nodes are connected to the circuit ground by identical capacitors C (or by impedances Zv). The resulting complex, size-dependent admittance between any of the « principal » nodes and the circuit ground can be(More)
Binary disordered systems are usually obtained by mixing two ingredients in variable proportions: conductor and insulator, or conductor and super-conductor. They present very specific properties, in particular the second-order percolation phase transition, with its fractal geometry and the multi-fractal properties of the current moments. These systems are(More)
In a recent Letter, Toader et al. [1] claimed to provide definitive experimental evidence for ring-exchange terms in the Hamiltonian of La2CuO4 by comparing the experimental antiferromagnetic static spin structure factor S Q with high-temperature series expansion. Ring-exchange terms arise at intermediate coupling in the effective lowenergy theory for the(More)
Sample to sample fluctuations ofthe multifractal moments of percolating randomresistor networks are studied via Monte Carlo simulations. For systems of sire L, these fluctuations depend on ~hp, the deviation from the critical concentration, only through the scaled variable ~hpL~'~. At ~hp = 0, these fluctuations depend on h, the ratio of the good and bad(More)
We describe a two-dimensional (2D) and a three-dimensional (3D) percolation model for ionic conductor-insulator composites such as copper(I) bromide-titanium dioxide (CuBr-TiO2) or lithium iodidealumina (LiI-Al2O3). These composites present an enhanced conductivity closely related to the insulator concentration. This effect is explained by the formation of(More)
A model which describes the competition between chain melting and orientational ordering in a monomolecular layer of long-chain amphiphilic molecules is studied. This model is analogous to the Berker-Cardy-Nelson-Scalapino model for phase transitions in films of 'HeHe mixtures. Their Midgal-Kadanoff renormalization-group approach is applied to the present(More)