Author(s): Das, S. ; Amaral, J. S. ; De, K. ; Willinger, M. ; Goncalves, J. N. ; Roy, A. ; Dhak, P. ; Giri, S. ; Majumder, S. ; Silva, C. J. R. ; Gomes, M. J. M. ; Mahapatra, P. K. ; Amaral, V. S.
Date: 2013
Persistent ID: http://hdl.handle.net/10773/19216
Origin: RIA - Repositório Institucional da Universidade de Aveiro
Subject(s): GIANT MAGNETORESISTANCE; PHASE-TRANSITION; MANGANITES; LAMNO3; SIZE
We report an unusual high-temperature ferromagnetic transition in bulk single-phase nanocrystalline La0.95Sr0.05MnO3+delta, achieved through localized strain and inhomogeneous Sr-doping. Magnetization measurements show a well defined transition at 290K and a broad one at similar to 150 K. HRTEM imaging reveals the strain on the highly crystalline nanometer sized grains and Sr-doping gradients, while oxygen homogeneity at the grain interfaces is confirmed by EELS-spectra. The magnetic behavior, far from the expected bulk phase diagram, shows how local doping and strain can strongly tune the macroscopic properties of a bulk material. (C) 2013 American Institute of Physics. [http://dx.doi.org/10.1063/1.4793657]
