Regensburg 2000 – wissenschaftliches Programm
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TT: Tiefe Temperaturen
TT 17: Postersitzung II: Pinning und Vortexdynamik (1-8), Supraleitung: Theorie (9-13), Korrelierte Elektronen (14-48), Niederdimensionale Systeme (49-68), Quantenflüssigkeiten (69-75)
TT 17.28: Poster
Mittwoch, 29. März 2000, 14:30–18:00, A
Anomalous Behavior of the Hall Coefficient and the Resistivity in Nearly Antiferromagnetic Metals — •Hiroshi kontani1,2, Kazuki Kanki3, and Kazuo Ueda2 — 1Theoretische Physik III, Universität Augsburg, 86135 Augsburg — 2ISSP, University of Tokyo, Japan — 3Osaka Prefecture University, Japan
The Hall coefficient (RH) of high-Tc cuprates in the normal state shows the notable non-Fermi liquid behavior: RH follows a Curie-Weiss type temperature dependence, and |RH| ≫ 1/|ne| at low temperatures. Similar anomalous behaviors of RH are observed in various nearly antiferromagnetic (AF) metals, e.g., κ-(BEDT-TTF) organic superconductors and V2O3. Here, we give the theoretical explanation of this long-standing problem from the standpoint of the nearly AF Fermi liquid. We study the vertex corrections for the current in order to satisfy the conserving laws, and find out that they give the divergent behavior of RH as the AF correlation length grows. This mechanism of vertex corrections have been overlooked previously in the relaxation-time approximation. Moreover, we perform the numerical calculations for high-Tc cuprates and for κ-(BEDT-TTF) salts, based on the fluctuation-exchange (FLEX) approximation which is a kind of the spin-fluctuation theory. The obtained results explain the characteristic behaviors of RH well.