ARPES study of the electronic structure in iron-based superconductors

• Grant number: 20/13701-0
• Support Opportunities: Scholarships abroad - Research Internship - Doctorate
• Start date: May 15, 2021
• End date: February 14, 2022
• Field of knowledge: Physical Sciences and Mathematics - Physics - Condensed Matter Physics
• Principal Investigator: Fernando Assis Garcia
• Grantee: Marli dos Reis Cantarino
• Supervisor: Claude Monney
• Host Institution: Instituto de Física (IF). Universidade de São Paulo (USP). São Paulo , SP, Brazil
• Institution abroad: Université de Fribourg, Switzerland
• Associated to the scholarship: 19/05150-7 - Electronic structure and magnetic excitations of magnetic superconductors, BP.DR

Abstract

Iron-based superconductors (FeSC) are an interesting family of materials in which high-temperature superconductivity appears. The understanding of the superconducting transition so far relates this phase with magnetic fluctuations in the system. Indeed, under the effect of electron or hole doping, magnetic order is suppressed and superconductivity emerges. Due to the itinerant behavior of spins in this family of materials, the Fermi Surface (FS) topology is a relevant parameter to understand the formation of the superconducting ground state. The FS of a material can be determined by Angle-Resolved PhotoEmission Spectroscopy (ARPES) experiments. We propose an exchange period in the group of Prof. Dr. Claude Felix Monney at the University of Fribourg, during which the candidate will further her knowledge about the technique and perform ARPES experiments of selected FeSC materials. Experiments will be performed at the in-house ARPES facility at the University of Fribourg and on synchrotron facilities in Europe (including as well RIXS experiments). Moreover, we propose time-resolved ARPES experiments of small band gap semiconductors in preparation for future studies of the FeSC by this kind of ultrafast spectroscopy. (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)

DE ABRANTES, JULIANA G.; CANTARINO, MARLI R.; DA SILVA NETO, WAGNER R.; FREIRE, VICTORIA V.; FIGUEIREDO, ALVARO G.; GERMANO, TARSIS M.; MOUNSSEF, BASSIM, JR.; BITTAR, EDUARDO M.; LEITHE-JASPER, ANDREAS; GARCIA, FERNANDO A.. Vibrational and structural properties of the RFe4Sb12 (R = Na, K, Ca, Sr, Ba) filled skutterudites. PHYSICAL REVIEW MATERIALS, v. 6, n. 8, p. 10-pg., 2022-08-16. (19/05150-7, 20/13701-0, 19/25665-1)

DE FIGUEIREDO, A. G.; CANTARINO, M. R.; NETO, W. R. DA SILVA; PAKUSZEWSKI, K. R.; GROSSI, R.; CHRISTOVAM, D. S.; SOUZA, J. C.; PIVA, M. M.; FREITAS, G. S.; PAGLIUSO, P. G.; et al. Orbital localization and the role of the Fe and As 4p orbitals in BaFe2As2 probed by XANES. Physical Review B, v. 105, n. 4, JAN 21 2022. (17/10581-1, 18/11364-7, 19/05150-7, 15/15665-3, 20/12283-0, 20/13701-0, 19/23879-4, 19/04196-3)