About

The Instituto de Ciencia de Materiales de Madrid (ICMM) is an institute of the Consejo Superior de Investigaciones Cientificas (CSIC) (Spanish National Research Council) founded in December 1986, that belongs to the Area of Science and Technology of Materials, one of the eight Areas in which the CSIC divides its research activities.

 

Our mission is to create new fundamental and applied knowledge in materials of high technological impact, their processing and their transfer to the productive sectors at local, national and European scales (the true value of materials is in their use), the training of new professionals, and the dissemination of the scientific knowledge.

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Biomimetismo y Bioinspiracion: fuentes de conocimiento para innovar en Ciencia de Materiales

Clément Sanchez  read more

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Non-planar Nanostructures at Atomic Scale
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Experimental Evidence of the Origin of Nanophase Separation in Low Hole-Doped Colossal Magnetoresistant Manganites

Cortes-Gil, R; Ruiz-Gonzalez, ML; Gonzalez-Merchante, D; Alonso, JM; Hernando, A; Trasobares, S; Vallet-Regi, M; Rojo, JM; Gonzalez-Calbet, JM

While being key to understanding their intriguing physical properties, the origin of nanophase separation in manganites and other strongly correlated materials is still unclear. Here, experimental evidence is offered for the origin of the controverted phase separation mechanism in the representative La1-xCaxMnO3 system. For low hole densities, direct evidence of Mn4+ holes localization around Ca2+ ions is experimentally provided by means of aberration-corrected scanning transmission electron microscopy combined with electron energy loss spectroscopy. These localized holes give rise to the segregated nanoclusters, within which double exchange hopping between Mn3+ and Mn4+ remains restricted, accounting for the insulating character of perovskites with low hole density. This localization is explained in terms of a simple model in which Mn4+ holes are bound to substitutional divalent Ca2+ ions.

Nano Lett., 2016

Figure 1. HAADF images along (a) [100] and (b) [101] corresponding to La0.9Ca0.1MnO3. The basic perovskite (ABO3) unit cell has been marked in yellow in both images. At the bottom, schematic models for the cationic position and enhanced details of the HAADF images have been inserted. Among A columns, atomic columns of different brightness, better perceived from a distance, reflecting different La and Ca occupations are arrowed in green and yellow, respectively.

Publications Highlights

ICMM-2016 - Sor Juana Inés de la Cruz, 3, Cantoblanco, 28049 Madrid, Spain. Tel: +34 91 334 9000. Fax: +34 91 372 0623. info@icmm.csic.es