XXXVII International Symposium on Dynamical Properties of Solids (DyProSo2019)

Session

Afternoon Session 1

9 Sept 2019, 14:05

11. Intimate link between Charge Density Wave, Pseudogap and Superconducting Energy Scales in Cuprates

Alain Sacuto (University Paris Diderot )

09/09/2019, 14:05

Oral

The cuprate high temperature superconductors develop spontaneous charge density wave (CDW) order below a temperature $T_{\rm CDW}$ and over a wide range of hole doping ($p$). An outstanding challenge in the field is to understand whether this modulated phase is related to the more exhaustively studied pseudogap and superconducting phases. To address this issue, it is important to extract the...

23. Spin-lattice coupling in the quantum spin ice candidate Tb2Ti2O7 revealed by THz spectroscopy

Sophie De Brion (Institut Néel)

09/09/2019, 14:25

Oral

In geometrically frustrated magnetism, the very nature of the ground state of Tb2Ti2O7, has remained a long standing conundrum. In this pyrochlore material, no conventional spin-ice or long-range magnetic order is stabilized, even at very low temperatures. Quantum fluctuations are suspected of being at the origin of such an exotic quantum phase, yet so far has lacked conclusive evidence. Using...

13. Sub-THz Raman response and critical dynamics in BaTiO3

Marc Fontana (Univ Lorraine, Metz, France)

11/09/2019, 13:45

Oral

Sub-THz Raman response and critical dynamics in BaTiO3 (talk)
Marc D. Fontana1,2*, Ninel Kokanyan1,2, and Thomas H. Kauffmann1,2
1Université de Lorraine, CentraleSupélec, LMOPS, F-57000 Metz, France
2Laboratoire Matériaux Optiques, Photonique et Systèmes, CentraleSupélec, Université Paris-Saclay, 57070, Metz, France
marc.fontana@univ-lorraine.fr
BaTiO3 (BTO) is considered as a textbook...

18. Narrow Optical Gap Ferroelectric Bi2ZnTiO6 Thin Films Deposited by RF Sputtering

Fábio Figueiras (IFIMUP & Physics and Astronomy Department, Sciences Faculty, Porto University)

11/09/2019, 14:05

Oral

This work reports the deposition of single phase Bi2ZnTiO6 thin films onto Pt/Si-based substrates using rf-sputtering method and the respective structural, morphological, optical and local ferroelectric characterization. The thin film grows in the polycrystalline form with tetragonal P4mm symmetry identified by X-ray diffraction. The lack of spatial inversion centre was confirmed by the second...

25. Electron localizations in alloy exhibiting nanotwinning

Martin Zelený (Faculty of Mechanical Engineering, Brno University of Technology)

11/09/2019, 14:25

Oral

Ni$_{2}$MnGa is a multiferroic ferromagnetic shape memory alloy in which a large spontaneous deformation up to 12% has been observed after application of an external magnetic field [1]. The key to material functionalities is the ferroelastic microstructure of martensite with deep hierarchical twinning up to nanoscale [2]. However, the microscopic origin of the martensitic transformation...

42. Molecular dynamics simulations of ferroelectric perovskites (BaTiO3 , BiFeO3) based on the effective Hamiltonian approach

Antonín Klíč

11/09/2019, 14:45

Oral

The theoretical description of ferroelectric perovskite materials at finite temperatures is commonly analyzed using Landau-Ginzburg type phenomenological models, and Monte-Carlo [MC] or molecular dynamics [MD] simulations. The parametrization of the phenomenological potentials originates from experimental data or from first principal calculations [1]. The MC and MD simulations use as bases the...

24. Tetragonal Ferroelectric Phase of GdMnO3 Epitaxial Thin Film Grown onto SrTiO3 (001)

Pedro Machado (FACULTY OF SCIENCES OF THE UNIVERSITY OF PORTO (IFIMUP))

11/09/2019, 15:05

Student Communication

High quality GdMnO3 thin films were deposited on SrTiO3 (001)-oriented substrates by RF magnetron sputtering. The structure, microstructure and polar properties were investigated in detail. The films grown up to a 35 nm thickness exhibit an epitaxial non-relaxed tetragonal symmetry, where the basal lattice parameters are imposed by the cubic symmetry of the substrate, contrarily to the...

28. Unravelling the Magnetoelectric Coupling Mechanisms in TbMnO_3 through Fe3+ substitution

André Maia (IFIMUP-IN, Institute of Nanoscience and Nanotechnology, Department of Physics and Astronomy of Faculty of Sciences, University of Porto, Portugal )

11/09/2019, 15:15

Student Communication

Multiferroics, such as orthorhombic rare-earth manganites, where both magnetic and ferroelectric orders coexist and are coupled to one another, have attracted great interest. The simultaneity of magnetic and ferroelectric phases gives rise to important effects associated with the cross correlation between order parameters and external fields. A remarkable consequence is that the elementary...