Berlin 2012 – scientific programme

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KR: Fachgruppe Kristallographie

KR 4: Joint Session "Multiferroics III - Strain / New Routes towards Multiferroicity" (MA jointly with DF, DS, KR, TT)

KR 4.3: Talk

Tuesday, March 27, 2012, 10:00–10:15, EB 301

Induced magnetoelectric response in Pnma perovskites — •Eric Bousquet and Nicola Spaldin — Materials Department, ETH Zurich, Switzerland

We use symmetry analysis to show that the G, C and A-type antiferromagnetic Pnma perovskites can exhibit magnetoelectric (ME) responses when a ferroelectric instability is induced with epitaxial strain. Using first-principles calculations we compute the values of the allowed ME response in strained CaMnO₃ as a model system. Our results show that large linear and non-linear ME responses are present and can diverge when close to the ferroelectric phase transition. By decomposing the electronic and ionic contributions, we explore the detailed mechanism of the ME response.