Hybrid paramagnon phonon modes at elevated temperatures in EuTiO3

Abstract

EuTiO3 (ETO) has recently experienced an enormous revival of interest because of its possible multiferroic properties which are currently in the focus of research. Unfortunately ETO is an unlikely candidate for enlarged multifunctionality since the mode softening - typical for ferroelectrics - remains incomplete, and the antiferromagnetic properties appear at 5.5K only. However, a strong coupling between lattice and Eu spins exists and leads to the appearance of a magnon-phonon-hybrid mode at elevated temperatures as evidenced by electron paramagnetic resonance (EPR), muon spin rotation (μSR) experiments and model predictions based on a coupled spin-polarizability Hamiltonian. This novel finding supports the notion of strong magneto-dielectric (MD) effects being realized in ETO and opens new strategies in material design and technological applications.

9 pages, 4 figures

References in corpus (5)

• musrfit: A free platform-independent framework for muSR data analysis
• Magnetodielectric effect and optic soft mode behaviour in quantum paraelectric EuTiO3 ceramics
• Lattice dynamical analogies and differences between SrTiO3 and EuTiO3 revealed by phonon-dispersion relations and double-well potentials
• Tuning the structural instability of SrTiO_3 by Eu doping: The phase diagram of Sr_1-xEu_xTiO_3
• Terahertz and infrared spectroscopic evidence of phonon-paramagnon coupling in hexagonal piezomagnetic YMnO3

Cited by in corpus (7)

• Magnetism in Semiconducting Molybdenum Dichalcogenides
• Magnetic field enhanced structural instability in EuTiO_{3}
• Spin-lattice coupling induced weak dynamical magnetism in EuTiO_3 at high temperatures
• Nonlinear pressure dependence of T_N in almost multiferroic EuTiO_3
• Pressure-Temperature phase diagram of multiferroic EuTiO${}_3$
• Magnetic interactions and the puzzling absence of any Raman mode in EuTiO3
• Magnetic field driven novel phase transitions in EuTiO${}_3$