info:eu-repo/semantics/article
Zener relaxation in manganites?
Fecha
2006-10-11Registro en:
Salva, Horacio Ramon; Ghilarducci, Ada Albertina; Seiro, Silvia S.; Leyva de Guglielmino, Ana Gabriela; Sanchez, Rodolfo Daniel; Zener relaxation in manganites?; Elsevier Science; Physica B: Condensed Matter; 384; 1-2; 11-10-2006; 62-64
0921-4526
CONICET Digital
CONICET
Autor
Salva, Horacio Ramon
Ghilarducci, Ada Albertina
Seiro, Silvia S.
Leyva de Guglielmino, Ana Gabriela
Sanchez, Rodolfo Daniel
Resumen
We conducted internal friction (IF) and elastic modulus measurements on several manganites in the temperature range 100-500 K. The La1-xCaxMnO3 series, with x=0, 0.1, 0.2, 0.33 and 1, was studied showing the magnetic phase transitions and two additional IF peaks around 320 and 400 K, respectively. Both, peaks associated to relaxations, present activation enthalpies of 2-3 and 3-6 eV, whose intensity depends on x. In this work we associate the 400 K IF peak to a Zener relaxation of the cations that occupied the same crystallographic site. We believe that the 320 K IF peak is due to different crystalline states of the samples.