Regensburg 2000 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 22: Postersitzung III: Supraleitende Anwendungen (1-4) Massive HTSL, Bandleiter, Filme (5-26), Transport in HTSL (27-30), Elektronenstruktur in Supraleitern (31-43), Borkarbide (44-50), Quantenphasen- und Metall-Isolator-Überg
änge (51-69)

TT 22.43: Poster

Donnerstag, 30. März 2000, 14:00–17:30, A

Antiferromagnetism and charge mobility in lightly hole doped La_2−xSr_xCuO₄ — •M. Hücker¹, B. Büchner¹, R. Gross¹, A. Hosni¹, H.-H. Klauß², C. Pflitsch¹, and J. Pommer¹ — ¹II. Physikalisches Institut, Universität zu Köln, D-50937 Köln — ²Institut für Metallphysik und Nukleare Festkörperphysik, TU Braunschweig, D-38106 Brauschweig

We have measured the magnetic susceptibility, the uniform magnetization M in magnetic fields up to 16T, the µSR, and the resistivity ρ of several series of Zn (0 ≤ z ≤ 0.25) and Sr (0 ≤ x < 0.05) doped La₂CuO₄. The dilution of the Cu spin lattice by non-magnetic Zn impurities causes an increase of the Néel temperature in lightly hole-doped compounds. This increase of T_N correlates with an increase of ρ, i.e. a decrease of the charge mobility. Moreover, the charge carrier motion strongly influences the temperature dependence of the staggered magnetization which we obtain from the µSR data as well as from an analysis of the non-linear field dependence of M. In addition, the latter allows to analyze details of the magnetic coupling and the temperature dependence of the magnetic correlation length. (supported by the DFG through SFB 341)