Phase diagram of La5/8-yNdyCa3/8MnO3 manganites

J SACANELL P LEVY A G LEYVA F PARISI AND L GHIVELDER

JOURNAL OF PHYSICS CONDENSED MATTER

IoP

Año: 2007 vol. 19 p. 186226 - 186235

0953-8984

Abstract. We report a detailed study of the electric transport and magnetic properties of the La5/8-yNdyCa3/8MnO3 manganite system. Substitution of La3+ by smaller Nd3+ ions reduces the mean ionic radius of the A-site ion. We have studied samples in the entire range between La-rich and Nd-rich compounds (0.1<y<0.625). Results of dc magnetization and resistivity show that doping destabilizes the ferromagnetic (FM) character of the pure La compound and triggers the formation of a phase-separated state at intermediate doping. We have also found evidence of a dynamical behaviour within the phase-separated state. A phase diagram is constructed, summarizing the effect of chemical substitution on the system. Print publication: Issue 18 (8 May 2007)Received 24 October 2006, in final form 13 February 2007Published 13 April 2007