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Berlin 2018 – scientific programme

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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 8: Multiferroics and magnetoelectrics I (joint session MA/KFM)

KFM 8.6: Talk

Tuesday, March 13, 2018, 11:00–11:15, EB 202

Soft modes in Ca3Mn2O7 - Direct observation of the order parameters in a hybrid improper ferroelectric material — •Dirk Wulferding1,2, Alexander Glamazda3,1, Peter Lemmens1,2, Bin Gao4, Sang-Wook Cheong4, and Kwang-Yong Choi51IPKM, TU-BS, Braunschweig, Germany — 2LENA, TU-BS, Braunschweig, Germany — 3ILTPE, NASU, Kharkov, Ukraine — 4Rutgers Univ., New Jersey, USA — 5Chung-Ang Univ., Seoul, Korea

In hybrid improper ferroelectric materials the order parameter is still under debate, but predicted to be a combination of rotation and tilting modes. In the title compound Ca3Mn2O7 we observe anomalous softening of rotation and tilting phonons through the transition from the ferroelectric to the paraelectric phase. This clearly underlines their role as order parameters. In addition, a coupling of the soft mode to the magnetic and the electronic subsystems is characterized through an observation of anomalous magnetic and multiphonon Raman scattering. Work supported by the Quantum- and Nanometrology initiative "QUANOMET" within project NL-4, DFG-RTG 1952/1 "NanoMet", Korea NRF Grants (No. 2009-0093817, 2012-046138), and the NSF MRI Grant No. MRI-1532006.

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