Atomic order and the interaction of electron and magnetic subsystems in epitaxial LaSr(Ca)MnO films
|Vladimir D. Okunev 1,2, Z. A. Samoilenko 1,2, T. A. Dyachenko 1, A. Abaloshev 2, M. Baran 2, P. Gierłowski 2, S. J. Lewandowski 2, Andrzej Szewczyk 2, Henryk Szymczak 2, R. Szymczak 2|
1. National Academy of Sciences of Ukraine, A.Galkin Donetsk Institute for Physics & Technology (DonPTI NASU), Roza Luxemburg 72, Donetsk 83114, Ukraine
The effect of structure on the optical, transport and magnetic properties of single-crystalline thin LaSr(Ca)MnO films with metallic clusters coherently contained within the basic crystallographic matrix was investigated. The films were grown by pulsed laser deposition. With growth temperature Ts in the 450 C < Ts <600 C range, the films are composed predominantly of a rhombohedral (dielectric) matrix and rhombohedral (metallic) clusters. Magnetic properties are similar to those of clusterized spin glasses and show a characteristic difference between Field Cooled (FC) and Zero Field Cooled (ZFC) magnetization M values in low (< 1kOe) magnetic fields. For growth temperature Ts >= 650 C, the film structure changes to rhombic matrix and rhombic clusters. This change is accompanied by a 3-9 orders of magnitude increase of film conductivity and the appearance of a, characteristic for manganites R(T) curve showing minima and maxima. magnetization at low temperatures is increased by an order of magnitude in comparison to the Ts <= 600C case.
Presentation: poster at E-MRS Fall Meeting 2003, Symposium D, by Vladimir D. Okunev
See On-line Journal of E-MRS Fall Meeting 2003
Submitted: 2003-05-27 15:26 Revised: 2009-06-08 12:55