Berlin 2008 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 32: Correlated Electrons: Poster Session

TT 32.55: Poster

Donnerstag, 28. Februar 2008, 14:00–18:00, Poster B

Unusual increase of the hole mobility in the quasi-1D Sr₁₄Cu₂₄O₄₁ upon Zn doping — •M. Yehia¹, P. Ribeiro¹, F. Kretzschmar¹, V. Kataev¹, C. Hess¹, R. Klingeler¹, B. Büchner¹, H. ElHaes², G. Roth², U. Ammerahl³, and A. Revcolevschi³ — ¹Leibniz-Institute for Solide State and Materials Research, IFW-Dresden, 01171 Dresden, Germany — ²RWTH-Aachen, 52056 Aachen, Germany — ³Laboratoire de Physico-Chimie de l’État Solide, Université Paris-Sud, 91405 Orsay, France

Single crystals of Sr₁₄Cu_24−xZn_xO₄₁ (0 ≤ x ≤ 0.75) were studied using ESR, static magnetization and conductivity measurements. ESR measurements reveal a remarkable influence of the hole dynamics on the Cu-spin relaxation for all values of x and suggest an increase of the hole mobility and a decrease of the charge ordering temperature. This is consistent with the conductivity measurements σ (T) which imply a significant increase of σ with increasing Zn content reflecting the enhancement of the hole mobility. Static magnetization shows that a spin-gap like feature is preserved for all Zn concentrations. We discuss possible scenarios for the remarkable impact of the Zn doping on the spin relaxation and conductivity.