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KR: Fachgruppe Kristallographie

KR 2: Joint Session "Multiferroics I - Junctions and Thin Films / Magnetoelectric Coupling" (MA jointly with DF, DS, KR, TT), Organization: Manfred Fiebig (ETH Zürich)

KR 2.6: Vortrag

Montag, 26. März 2012, 11:15–11:30, EB 301

Guest molecules in ABX3 metal-organic frameworks: multiferroicity and magnetoelectricity — •Alessandro Stroppa¹, Prashant Jain², Paolo Barone¹, Martijn Marsman³, Juan Manuel Perez-Mato⁴, Anthony K. Cheetham⁵, Harold W. Kroto², and Silvia Picozzi¹ — ¹CNR-SPIN, L'Aquila, Italy — ²Department of Chemistry and Biochemistry, Florida State University Tallahassee, FL 32306 (USA) — ³University of Vienna, Faculty of Physics and Center for Computational Materials Science (Austria) — ⁴Departamento de Fisica de la Materia Condensada Facultad de Ciencia y Tecnologia, UPV/EHU, Bilbao (Spain) — ⁵Department of Materials Science and Metallurgy University of Cambridge (UK)

Metal-organic frameworks (MOFs) are increasingly regarded as promising materials. MOFs with perovskite architecture have recently branched out into the field of multiferroics, materials which have both magnetic and ferroelectric orders. Here, we focus on a MOF compound and theoretically show that it is ferroelectric and this ferroelectricity is the cause of a weak ferromagnetic coupling. In inorganic perovskite-like compounds, octahedral tilting and Jahn-Teller distortions are usually non-polar modes. In this MOF, however, their cooperative link to A-groups via hydrogen bondings finally breaks inversion symmetry, and induces a ferroelectric polarization. We show that the switching of polarization direction implies the reversal of the weak ferromagnetic component, therefore allowing the long-sought electrical control of the magnetization.