Regensburg 2019 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 54: Correlated Electrons: Complex Oxides and Other Materials

TT 54.13: Talk

Thursday, April 4, 2019, 12:45–13:00, H22

Multiferroicity in Fe₄Ta₂O₉ — Soumendra Panja¹, Jitender Kumar¹, Luminita Harnagea¹, Arun Nigam², Ramesh Nath³, P . K Mukharjee³, and •Sunil Nair¹ — ¹IISER Pune, India — ²TIFR Mumbai, India — ³IISER Tvm, India

We report on the observation of multiple coupled magnetic and ferroelectric states in the Fe₄Ta₂O₉ system, which appears to be the only genuine multiferroic in its material class. We suggest that the observed properties arise as a consequence of an effective reduction in the dimensionality of the magnetic lattice, with the magnetically active Fe²⁺ ions preferentially occupying a quasi 2D buckled honeycomb structure. A rich variety of coupled magnetic and ferroelectric states are seen which is similar to that observed in the distorted Kagome systems.