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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Forthcoming Events

MAY04/12:00

Fermi velocity renormalization of graphene (RELOADED)
Tobias Stauber  read more

MAY05/10:00

Science at synchrotrons and the ESRF EBS
Francesco Sette  read more

MAY08/12:00

The origins of life under a systems chemistry perspective
Carlos Briones  read more

News

Premio Nacional de la Academia de Ciencias de Cuba 2016. Colaboración del ICMM, Eduardo Ruiz-Hitzky y Pilar Aranda

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Jose S. Moya and José F. Bartolomé, ICMM, develops damage-tolerant, fatigue-resistant, and biocompatible ceramic–metal composite

The American Ceramic Society Read more

 

Nontrivial Role of Interlayer Cation States in Iron-Based Superconductors

Daniel Guterding, Harald O. Jeschke, I.I. Mazin, J.K. Glasbrenner, E. Bascones, and Roser Valentí

Unconventional superconductivity in iron pnictides and chalcogenides has been suggested to be controlled by the interplay of low-energy antiferromagnetic spin fluctuations and the particular topology of the Fermi surface in these materials. Based on this premise, one would also expect the large class of isostructural and isoelectronic iron germanide compounds to be good superconductors. As a matter of fact, they, however, superconduct at very low temperatures or not at all. In this work we establish that superconductivity in iron germanides is suppressed by strong ferromagnetic tendencies, which surprisingly do not originate from changes in bond angles or bond distances with respect to iron pnictides and chalcogenides, but are due to changes in the electronic structure in a wide range of energies happening upon substitution of atom species (As by Ge and the corresponding spacer cations). Our results indicate that superconductivity in iron-based materials may not always be fully understood based on d or d-p model Hamiltonians only.

Phys. Rev. Lett. 2017

Crystal structures of RbFe2 As2, YFe2 Ge2 and MgFeGe. The unit cells and interatomic distances are true to scale. The numbers next to the unit cells indicate the nominal valence of atoms at the same vertical positions.

Publications Highlights

ICMM-2017 - 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