Anisotropy of the mixed-state resistance of Tl₂Ba₂CaCu₂O₈ single crystals

¹Lehrstuhl für Experimentalphysik I, Universität Augsburg, Memminger Str. 6, D-86135 Augsburg, Germany
²Institute of Solid State Physics, Russian Academy of Sciences, 142432 Chernogolovka, Moscow District, Russia

Received 5 June 1996, revised version 30 November 1996, accepted 30 November 1996

Keywords: High-T_c-Superconductors; Electrical Transport; Pancake and Josephson vortices

Cristallization of electrons confined to a lattice

Max-Planck-Institut für Physik komplexer Systeme, Bayreuther Str. 40, D-01187 Dresden, Germany

Received 30 October 1996, accepted 20 December 1996

Keywords: Electron crystallization; Charge ordering; Yb₄As₃

A unified treatment of Ising model magnetizations

¹ Fachbereich Physik, Freie Universität Berlin, Arnimallee 14, D-14195 Berlin, Germany

Received 28 October 1996, revised version 25 November 1996, accepted 9 December 1996

Keywords: Ising model; Magnetization; Functional equations; Surfaces; Corners

Similarity renormalization of the electron-phonon coupling

Institut für Theoretische Physik, Ruprecht-Karls-Universit&aunl;t, Philosophenweg 19, D-69120 Heidelberg, Germany

Received 12 August 1996, revised version 20 December 1996, accepted 6 January 1997

Keywords: Electron-phonon coupling; Effective interactions; Superconductivity

Studying invisible axion models at high temperature

Dipartimento di Fisica, Universita di Roma and Instituto Nazionale di Fisica Nucleare, sez di Roma, P.le A. Moro 5, I-00185 Roma, Italy

Received 10 November 1996, accepted 14 January 1997

Keywords: Strong CP conservation; Axions; Vacuum phase transitions; Higgs scalar fields