153 citations · 1.3k across the 59 of their papers we have counts for
18 papers · 1 filter
From phonons to domain walls, the central peak and critical slowing down
Ekhard K. H. Salje, Annette Bussmann-Holder
We investigate perovskite oxides from different aspects, namely their pseudoharmonic dynamical properties, their dynamical properties when strong anharmonicity exists and the intri…
The incredible diversity of structural and magnetic instabilities in EuTiO3: from paramagnetic to spin glass, spin liquid and antiferromagnetic order
Annette Bussmann-Holder, Reinhard K. Kremer, Efthymios Liarokapis +1
The perovskite oxide EuTiO3 (ETO) has attracted increased scientific interest due to its potential multiferroic properties and magnetic activity above and below its structural phas…
Local positional and spin symmetry breaking as a source of magnetism and insulation in paramagnetic EuTiO3
Oleksandr I. Malyi, Xin-Gang Zhao, Annette Bussmann-Holder +1
We consider theoretically the paramagnetic phases of EuTiO3 that represent configurations created by two sets of microscopic degrees of freedom (m-DOF): positional symmetry breakin…
Magnetic field driven novel phase transitions in EuTiO
P. Pappas, M. Calamiotou, M. Polentarutti +3
The influence of an external static magnetic field (up to 480 mT)on the structural properties of EuTiO (ETO) polycrystalline samples was examined by powder XRD at the Elettra s…
Magnetic interactions and the puzzling absence of any Raman mode in EuTiO3
P. Pappas, E. Liarokapis, M. Calamiotou +1
Polycrystalline ceramic samples and a single crystal of EuTiO3 have been investigated by Raman spectroscopy in the temperature range 80-300 K. Although synchrotron XRD data clearly…
Unconventional co-existence of insulating nano-regions and conducting filaments in reduced SrTiO3: mode softening, local piezoelectricity and metallicity
Annette Bussmann-Holder, Hugo Keller, Arndt Simon +2
Doped SrTiO3 becomes a metal at extremely low doping concentrations n and is even superconducting with the superconducting transition temperature adopting a dome-like shape with th…
Transparent EuTiO3 films: a novel two-dimensional magneto-optical device for light modulation
Annette Bussmann-Holder, Krystian Roleder, Benjamin Stuhlhofer +6
The magneto-optical activity of high quality transparent thin films of insulating EuTiO3 (ETO) deposited on a thin SrTiO3 (STO) substrate with both being non-magnetic materials are…
Pressure-Temperature phase diagram of multiferroic EuTiO
P. Parisiades, E. Liarokapis, J. Köhler +2
The structural transformation of multiferroic EuTiO has been intensively investigated by synchrotron x-ray diffraction at pressures up to 50.3 GPa and temperatures from 50 to 5…
Spin-lattice coupling induced weak dynamical magnetism in EuTiO_3 at high temperatures
Z. Guguchia, H. Keller, R. K. Kremer +5
EuTiO_3, which is a G-type antiferromagnet below T_N = 5.5 K, has some fascinating properties at high temperatures, suggesting that macroscopically hidden dynamically fluctuating w…
Elastic Anomalies Associated with the Antiferroelectric Phase Transitions of PbHfO3 Single Crystals
Jae-Hyeon Ko, Krystian Roleder, Andrzej Majchrowski +1
The temperature dependence of the elastic properties of antiferroelectric PbHfO3 was investigated by Brillouin scattering. The two structural phase transitions of antiferroelectric…
Lattice and polarizability mediated spin activity in EuTiO_3
K. Caslin, R. K. Kremer, Z. Guguchia +3
EuTiO_3 is shown to exhibit novel strong spin-charge-lattice coupling deep in the paramagnetic phase. Its existence is evidenced by an, until now, unknown response of the paramagne…
Nonlinear pressure dependence of T_N in almost multiferroic EuTiO_3
Z. Guguchia, K. Caslin, R. Kremer +7
The antiferromagnetic (AFM) phase transition temperature T_N of EuTiO_3 has been studied as a function of pressure p. The data reveal a nonlinear dependence of T_N on p with T_N in…
Magnetic field enhanced structural instability in EuTiO_{3}
Z. Guguchia, H. Keller, J. Kohler +1
EuTiO_{3} undergoes a structural phase transition from cubic to tetragonal at T_S = 282 K which is not accompanied by any long range magnetic order. However, it is related to the o…
Hybrid paramagnon phonon modes at elevated temperatures in EuTiO3
A. Bussmann-Holder, Z. Guguchia, J. Köhler +3
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 ET…
The polarizability model for ferroelectricity in perovskite oxides
Annette Bussmann-Holder
This article reviews the polarizability model and its applications to ferroelectric perovskite oxides. The motivation for the introduction of the model is discussed and nonlinear o…
Structural instability of EuTiO3 from X-ray powder diffraction
J. Köhler, R. Dinnebier, A. Bussmann-Holder
We have recently predicted and subsequently verified experimentally by specific heat measurements that EuTiO3 undergoes a structural phase transition at elevated temperature TS = 2…
Tuning the structural instability of SrTiO_3 by Eu doping: The phase diagram of Sr_1-xEu_xTiO_3
Z. Guguchia, A. Shengelaya, H. Keller +2
The phase diagram of Sr_1-xEu_xTiO_3 is determined experimentally by electron paramagnetic resonance and resistivity measurements and analyzed theoretically within the self-consist…
Interplay between proton ordering and ferroelectric polarization in H-bonded KDP-type crystals
S. Koval, J. Kohanoff, R. L. Migoni +1
The origin of ferroelectricity in KH_2PO_4 (KDP) is studied by first-principles electronic structure calculations. In the low-temperature phase, the collective off-center ordering…