Effect of very high pressure on the structural and dynamical properties of perovskites

• Grant number: 17/11025-5
• Support Opportunities: Scholarships abroad - Research
• Start date: January 15, 2018
• End date: January 14, 2019
• Field of knowledge: Physical Sciences and Mathematics - Physics - Condensed Matter Physics
• Principal Investigator: Ariano De Giovanni Rodrigues
• Grantee: Ariano De Giovanni Rodrigues
• Host Investigator: Andrea Gauzzi
• Host Institution: Centro de Ciências Exatas e de Tecnologia (CCET). Universidade Federal de São Carlos (UFSCAR). São Carlos , SP, Brazil
• Institution abroad: Université Pierre et Marie Curie (Paris 6), France

Abstract

This propose refers to research activities that shall carried out at the Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie (IMPMC) of the Université Pierre et Marie Curie. This project aims at using high-pressure as a clean control parameter to establish relationships between the structures and magnetic/ferroelectric properties of multiferroics. We propose the accomplishment of Raman measurements at high pressure in well-characterized samples of transition-metal substituted perovskites. Since the evolution of Raman modes with pressure is strongly dependent on local structural changes, these analyses will enable us study influence of the lattice distortions induced by substitutions on the ferroelectricity and address the interplay between the magnetic response and the structural disorders. On the other hand, mixed-valence quadruple perovskite NaMn3Mn4O12 offers an original opportunity to study multiferroicity in the absence of disorder. A systematic study of the effect of pressure on the charge-ordered phase transition in this system shall be conducted by means of in situ x-ray diffraction, Raman spectroscopy and electrical transport measurements using diamond-anvil cells and a special Bridgman-type cell. The study of the behavior of the phonon modes and structural changes at critical pressures combined with transport measurements as a function of pressure shall enable us to study the role of the Jahn-Teller dynamics on the Verwey transition and of the metal-insulator transition controlled by orbital ordering. (AU)

Scientific publications

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

CUNHA, T. R.; SAMPAIO, D. V.; PENA, R. B.; MOULTON, B. J. A.; LANCELOTTI, R. F.; ALABARSE, F. G.; RODRIGUES, A. D.; PIZANI, P. S.. Thermal expansion and compressibility of alamosite (PbSiO3) determined by in-situ synchrotron X-ray diffraction. CERAMICS INTERNATIONAL, v. 48, n. 23, p. 5-pg., 2022-11-07. (16/18567-5, 17/11025-5, 17/11868-2, 19/12383-8)