Banca de QUALIFICAÇÃO: VICTOR BREDA ZACHE

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
STUDENT : VICTOR BREDA ZACHE
DATE: 22/08/2024
TIME: 10:30
LOCAL: Sala de Seminários I - Instituto Internacional de Física
TITLE:

Spin nematic phases for multipolar Kondo interactions in heavy-fermions materials

KEY WORDS:

heavy fermions, nematic phases, multipolar Kondo interaction, strongly correlated systems.

PAGES: 17
BIG AREA: Ciências Exatas e da Terra
AREA: Física
SUMMARY:

Heavy fermion compounds are typical examples of strongly correlated systems in Condensed Matter. Although they
have been known for many years, there is still much to explore regarding nematic phases in heavy fermions. A typical example
is the compound CeRhIn5, extensively studied in the literature over the past two decades, which offers an excellent
opportunity to test models explaining these exotic phases. In this work, starting from a two-dimensional model considering p
and f orbitals, we will develop an effective model for nematic phases using perturbation theory, treating the f orbitals as
quasi-localized. We will also study the phase diagram of the model employing a multipolar approach to interactions combined
with mean-field techniques. In doing so, we hope to identify the necessary conditions for a spontaneous rotational symmetry
breaking due to the coupling of conduction electrons with the quadrupole tensor of two localized spins. Such a mechanism can
be useful for controlling properties like the anisotropy of electrical resistivity in some material through magnetic interactions.

COMMITTEE MEMBERS:
Interno - 404927 - ALVARO FERRAZ FILHO
Presidente - ***.839.841-** - DMITRY MELNIKOV - UFRN
Interno - 1328776 - RAFAEL CHAVES SOUTO ARAUJO