CONFERENCE SCOPE:
Advanced nanomaterials
INSTITUTION:
University of São Paulo, Brazil
TITLE:
Revisiting permanent magnets RECo5
ABSTRACT:
In this talk, we revisit the low-lying energy scales responsible for the excellent magnetic properties in the family of compounds RECo5 (RE= Nd, Sm and Y). We focus our discussion on the role that crystal electric field (CEF) plays in both magnetic anisotropy and spin reorientation of the single crystal NdCo5 is investigated by inelastic neutron scattering (INS) and theoretical calculations [1]. Besides, we discuss a systematic study of Sm substitution in YCo5, namely, the polycrystal SmxY1-xCo5 (x = 0 to 1) [2]. Combining bulk physical properties (electrical transport, magnetization and specific heat) and x-ray spectroscopies (XRD, XPS and XAS) we reveal how f-electrons influence different magnetic, electronic and valence states leading to a rich variety of phase transitions, electronic correlations and energy excitations which create new routes for the realization of hard magnets at the nanoscopic scale.
References:
[1] F. Passos et al. Phys. Rev. B 108, 174409 (2023)
[2] F. Passos, et al. SciPost Phys. Proc. 11, 021 (2023)
BIO:
Prof. Julio Larrea is currently the head of the Laboratory for Quantum Matter under Extreme Conditions (LQMEC), at the University of São Paulo. He completed his PhD at the Brazilian Research Center for Physics (CBPF), doing several postdocs in the Laboratory for Quantum Magnetism at the Ecolé Polytechnique Fédérale de Lausanne, EFPL (Switzerland) and the Institute of Solid State Physics, Vienna University of Technology, TUWIEN (Austria). His research is eager to deal with the synthesis of materials (both bulk and nanoscopic systems) and the development of state-of-the-art experimental methods under extreme conditions (very-low temperatures, High Pressures and intensive magnetic fields) with the aim to uncover novel states in correlated quantum matter, to understand the underlying physics in quantum phase transitions, to get advance in the development of new generation of permanent magnets and to reveal the fate of topological quantum phases.