Transport in granular materials
Jeudi 14/02/2008, 11:00
Petit Amphi, LPS Bât. 510, Orsay
Transport properties of granular metals are discussed taking into account effects of Coulomb interaction. An important region of temperatures is identified where the behavior of the granular metals is drastically different from that of homogeneously disordered metals. In this region of not very low temperatures that can easily be excessed experimentally the resistivity logarithmically depends on temperature in all dimensions of the array of the grains. Both the longitudinal and Hall resistivity are calculated. Although the longitudinal resistivity is very sensitive to intergrain tunneling, the Hall resistivity does not depend on this parameter giving a direct information about the carrier concentration inside the grains.