Banca de QUALIFICAÇÃO: CESAR AUGUSTO SONEGO
Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.STUDENT : CESAR AUGUSTO SONEGO
DATE: 07/02/2023
TIME: 14:00
LOCAL: Auditório 801 no 8o andar do Bloco B do Campus Santo André da Universidade Federal do ABC
TITLE:
Study of Novel Magnetic Phases in Vanadium Sulfide Single Crystals
PAGES: 50
BIG AREA: Ciências Exatas e da Terra
AREA: Física
SUBÁREA: Física da Matéria Condensada
SUMMARY:
Strongly correlated electron systems are known to give rise to a variety of exotic properties and new quantum phases, such as non-Fermi liquids, high-temperature superconductors, heavy-fermion systems and quantum spin liquids. Transition metal chalcogenides such as the vanadium sulphides, V_xS_8, show an extremely broad variety of physical phenomena that can strongly depend on stoichiometry and purity. Structural, magnetic, and charge-density wave phase transitions may occur upon varying the temperature, pressure or chemical composition x. These compounds are interesting since the character of the d-electrons varies widely depending on x, ranging from weak itinerant-electron antiferromagnetism to considerably localized-electron antiferromagnetism. The focus of this work is in the weak itinerant antiferromagnets, in which the Néel temperature may be tuned to a quantum phase transition by applying hydrostatic pressure. As such, they are candidates to exhibit non-Fermi liquid behaviour and magnetically mediated superconductivity, where electrons are paired in a finite angular momentum state. Also, new magnetic phases can emerge in high purity single crystals of the compound V5S8 with high magnetic fields applied, being possible to prepare a magnetic phase diagram for the compound under study.
COMMITTEE MEMBERS:
Presidente - Interno ao Programa - 1734908 - FABIO FURLAN FERREIRA
Membro Titular - Examinador(a) Interno ao Programa - 1544408 - GUSTAVO MARTINI DALPIAN
Membro Titular - Examinador(a) Interno ao Programa - 1545447 - MARCOS ROBERTO DA ROCHA GESUALDI
Membro Suplente - Examinador(a) Interno ao Programa - 1760527 - FLAVIO LEANDRO DE SOUZA