IUVSTA 15th International Vacuum Congress (IVC-15), AVS 48th International Symposium (AVS-48), 11th International Conference on Solid Surfaces (ICSS-11)
    Magnetic Interfaces and Nanostructures Tuesday Sessions
       Session MI-TuP

Paper MI-TuP5
Observation of the Two-stage Magnetic Transition and the CMR Effect in Aged La@sub 0.5@Sr@sub 0.5@CoO@sub 3-@@delta@ Films Prepared by Laser Ablation

Tuesday, October 30, 2001, 5:30 pm, Room 134/135

Session: Emerging Materials & Nanostructures Poster Session
Presenter: V.G. Prokhorov, Institut of Metal Physics, Ukraine
Authors: V.G. Prokhorov, Institut of Metal Physics, Ukraine
J.S. Park, Hanyang University, Korea
S.Y. Park, Hanyang University, Korea
Y.P. Lee, Hanyang University, Korea
K.W. Kim, Sunmoon University, Korea
V.M. Ishchuk, Insitute of Single Crystals, Ukraine
I.N. Chukanova, Institute of Single Crystals, Ukraine
Correspondent: Click to Email
The magnetic and transport investigations have been carried out for the as-deposited and the long-time aged La@sub 0.5@Sr@sub 0.5@CoO@sub 3-@@delta@ films prepared by pulsed laser deposition. It was shown that a decrease in the oxygen concenturation during aging of the film leads to the tetragonal distortion of the crystal lattice, to a shift of the metal-insulator transition temperature to a lower temperature(T@sub p@ = 250 K), and to the observation of a CMR effect (up to 3 % at magnetic field of 5 T). In addition to the usual ferromagnetic transition at T@sub c@ = 250 K, the second magnetic transition was observed at T@sub M@ = 50 K that is treated as the appearance of a cluster glass magnetic state. The non-monotonic behavior of the resistance observed in the low-temperature range, T < T@sub p@, is explained by the weak localization of the carriers.