Phase diagram of low doping manganites

R. DE RENZI; G. ALLODI; G. AMORETTI; M. CESTELLI GUIDI; S. FANESI; G. GUIDI; F. LICCI; A. CANEIRO; F.D. PRADO; R.D. SANCHEZ; S. OSEROFF; A. AMATO

PHYSICA B - CONDENSED MATTER

ELSEVIER SCIENCE BV

Lugar: Amsterdam; Año: 2000 vol. 289 p. 85 - 88

0921-4526

We present a study performed on several LaMnO3`x@2compositions. Detailed analysis around x"0.09 detects phaseseparation between a higher transition, ¹#, and a lower one ¹N, with coexisting #uctuating and magnetically orderedclusters (the Ne`el point, ¹N, being the onset of an inhomogeneous non-collinear antiferromagnetic order detected byneutrons). The ordered clusters give rise to an extremely fast, static Kubo}Toyabe muon depolarization, while mixedstatic and dynamic local "elds are detected inside the #uctuating clusters. Below ¹Nprecession frequency lines areresolved, despite the huge broadening introduced by localized Mn4` ordered moments. A phase diagram is obtained andbrie#y discussed in the context of electronic phase separation.