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Orbital magnetism in double perovskite compounds under extreme conditions by synchrotron radiation techniques

Grant number: 16/24137-3
Support type:Scholarships abroad - Research Internship - Post-doctor
Effective date (Start): February 01, 2017
Effective date (End): January 31, 2018
Field of knowledge:Physical Sciences and Mathematics - Physics - Condensed Matter Physics
Principal researcher:Narcizo Marques de Souza Neto
Grantee:Carlos Augusto Escanhoela Júnior
Supervisor abroad: Daniel Haskel
Home Institution: Centro Nacional de Pesquisa em Energia e Materiais (CNPEM). Ministério da Ciência, Tecnologia e Inovações (Brasil). Campinas , SP, Brazil
Research place: Advanced Photon Source (APS), United States  


We propose to study the electronic and magnetic properties of "Iridates" (Iridium containing oxides) where sizable spin-orbit interactions in third-row transition metal Ir ions lead to novel properties not achievable in oxides with first- and second-row transition metal ions. Double perovskite Sr2FeIrO6 displays competition between ferromagnetic and antiferromagnetic interactions, and the magnetic ground state can be tuned by alteration of Ir valence and/or lattice distortion. The layered iridate, Na2IrO3, displays competition between isotropic and anisotropic exchange interactions with a ground state in proximity to a a quantum spin liquid. We will use pressure as an external parameter to tune the electronic and magnetic ground states and probe emergence of novel properties at low temperatures with x-ray absorption near edge spectroscopy (XANES), x-ray magnetic circular dichroism (XMCD) and x- ray resonant magnetic scattering (XRMS) techniques at synchrotron light sources. These project includes commissioning of a panoramic diamond anvil cell (DAC) for XRMS measurements. The post-doctoral scientist Dr. Escanhoela will collaborate with the Magnetic Materials Group of the Advanced Photon Source (APS - USA) under the scientific supervision of Dr. Daniel Haskel, where he will perform experiments with techniques and instrumentation that are not yet available in Brazil. (AU)

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Scientific publications (4)
(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)
ESCANHOELA JR, C. A.; FABBRIS, G.; SUN, F.; PARK, C.; GOPALAKRISHNAN, J.; RAMESHA, K.; GRANADO, E.; SOUZA-NETO, N. M.; VAN VEENENDAAL, M.; HASKEL, D.. Tuning magnetic coercivity with external pressure in iron-rhenium based ferrimagnetic double perovskites. Physical Review B, v. 98, n. 5, . (16/24137-3)
VEIGA, L. S. I.; ETTER, M.; GLAZYRIN, K.; SUN, F.; ESCANHOELA, C. A. JR; FABBRIS, G.; MARDEGAN, J. R. L.; MALAVI, P. S.; DENG, Y.; STAVROPOULOS, P. P.; et al. Pressure tuning of bond-directional exchange interactions and magnetic frustration in the hyperhoneycomb iridate beta-Li2IrO3. Physical Review B, v. 96, n. 14, . (13/14338-3, 16/24137-3)
LAGUNA-MARCO, M. A.; ARIAS-EGIDO, E.; PIQUER, C.; CUARTERO, V; HERNANDEZ-LOPEZ, L.; KAYSER, P.; ALONSO, J. A.; BARKER, J. A. T.; FABBRIS, G.; ESCANHOELA JR, C. A.; et al. Magnetism of Ir5+-based double perovskites: Unraveling its nature and the influence of structure. Physical Review B, v. 101, n. 1, . (16/24137-3)
PAJEROWSKI, D. M.; ESCANHOELA, JR., C. A.; HASKEL, D.; PRISK, T. R.; FRONTZEK, M. D.; PHELAN, D.; MIHALIK, JR., M.; MIHALIK, M.. Nd ordering, cluster formation, and the origin of negative magnetization in NdMn0.8Fe0.2O3+delta. Journal of Magnetism and Magnetic Materials, v. 497, . (16/24137-3)

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