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El Instituto de Ciencia de Materiales de Madrid (ICMM) es un Instituto del Consejo Superior de Investigaciones Científicas (CSIC), perteneciente al Área de Ciencia y Tecnología de Materiales.

 

La misión del ICMM es generar nuevos conocimientos básicos y aplicados en materiales y procesos con alto valor añadido y su transferencia a los sectores productivos de ámbito local, nacional y europeo (el verdadero valor de los materiales está en su uso), la formación de nuevos profesionales en el campo de los materiales y la divulgación del conocimiento científico.

 

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Spatial variation of a giant spin–orbit effect induces Landau-like levels in graphene
Fabián Calleja  leer más

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Ángeles Monge Bravo, del ICMM, Científica de mayo de 2016 en la web de AMIT.

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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.

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ICMM-2015 - Sor Juana Inés de la Cruz, 3, Cantoblanco, 28049 Madrid, España. Tel: +34 91 334 9000. Fax: +34 91 372 0623. info@icmm.csic.es