X-ray Spectroscopy of Quantum Materials

LATEST NEWS

Last update: 28/08/2025

• The group is out for a talk (Fernando) and poster presentations (Victor and Leonardo) at the RIXS/REXS conference at the CNPEM campus.  Former group member Marli will be there for a talk, as well as many other past and present collaborators!

• A new collaboration paper, authored by Karina Torres, was just accepted in ACS Omega! This work is part of Karina's PhD work, which I co-advised and was financed by FAPESP.  Congratulations Karina !!!

• Our collaboration paper with the Ames National Lab/Iowa State University is now published (see https://arxiv.org/abs/2506.10905 for the pre-print or Phys. Rev. B 111, 245160, 2025). The paper introduces CeCo2Al8 as a new anisotropic Kondo Lattice for which T*_K  (the Kondo coherence temperature) is anisotropic i.e: it depends on the direction of the resistivity measurements. We speculate that this may be linked to the Fermi surface anisotropy. However, we do not discard that the Kondo hybrization itself may be anisotropic. 

• Fapesp fellowships for Howard and Esther approved!! Congrats to you both!

• During the EOSBF 2025 in Belém, our group contributed two oral presentations and an invited talk. The invited talk was about our ARPES works in the past years and our oral contributions presented some more recent RIXS work by our group. Hopefully, we will have a lot of people in Cuiaba next year for the EOSBF 2026!!

• Congratulation to Victor Carreira for his oral presentation in EOSBF 2025 (Belém)!

• From April 24 to 30, our group will be at the IPE beamline of the LNLS for RIXS experiments. We will work with the correlated insulator BaFe2S3, probing its unconventional electronic properties.  See some photos.

• Esther Leite and Henrique Gabriel joined our research group as, respectively, undergraduate and master students. Welcome for you both!

• A new collaboration paper, authored by Karina Torres, was just published in Dalton Transactions! This work is part of Karina's PhD work, which I co-advise and is financed by FAPESP. Congratulations Karina !!!

• Leonardo Donatello just joined our group for an undergrad research program. Leonardo will work with RIXS of correlated materials. FAPESP will finance Leonardo's work. 

• Our group welcomes Howard Brian, a new graduate student at our institute. Howard will investigate the synthesis and characterization of ternary Y-Fe-Ge compounds.  FAPESP will finance Howard' work. 

• We welcome Gabriela Scavone, a new undergrad student joining our reasearch group. For six months, Gabriela will learn the basics of X-ray diffraction experiments and then we will think of a research project. Wellcome Gabriela!!! 

• From 05/02  to 10/02 our group (me + Victor) will go to SIRIUS to join a research project led by Prof. Alberto de La Torre Duran from Northeastern University. Experiments will be performed at the IPE beamline.  FAPESP will finance our field work. 

• CNPq reasearch grant (international collaboration) approved! With Prof. Raquel Ribeiro, from Iowa State University/Ames National Laboratory, Prof. Eric Andrande from IFUSP and Dr. Marli Cantarino from the ESRF,  our group will investigate the magnetic anisotropy in mixed valence rare-earth based materials. We will focus on anisotropic Kondo lattices and on ferromagnetic Kondo lattices.

• FAPESP research grant approved! With colleagues Abner de Siervo (UNICAMP), Eduardo Bittar (CBPF) and Walber Brito (UFMG), our group will investigate high temperature superconductivity and other electronic orders on Hund's metals. Please see related IC and Master fellowship opportunities.

• Our new paper on the electronic structure of Cr-substituted BaFe2As2 is now published on Sci Post Physics!  Read some comments about this paper. 

• Congratulations to (now) Dr. Rodrigo Calle, who defended his doctor thesis.  Good job Rodrigo!!!

• A new collaboration paper, led by colleagues from the Iowa State University/Ames National Laboratory, is now out at the Arxivs.

• Congratulations to Dr. Marli Cantarino, former student in our group, who received a prize for "best graduate student paper" and a honorable mention for "best PhD thesis" from our graduate school.  Dr. Marli is now a postdoctoral researcher at the ESRF.