Palestrante: Dra. Carlene Paula Silva de Farias – DFMC/IFGW/UNICAMP

Abstract: This seminar will be divided into two parts. In the first part, I will talk about the recent results concerning the stability of spin-liquid (SL) states in a realistic three - dimensional body-centered tetragonal (BCT) lattice as a consequence of frustration [Phys. Rev. B 94, 134420 (2016)]. We consider the Heisenberg model in tis particular structure which presents the competition between antiferromagnetic (AF) and spin liquid phases. The antiferromagnetic state is study in the framework of spin - wave analysis whereas the spin liquid analysis has been carried out in an algebraic SU (n) generalization of the spin liquid representation. In the second part, I will present an effective theory of Raman scattering experiments that takes into account these particular phases. Finally, I will discuss the relevance of the results for correlated systems with BCT crystal structure. Particularly, providing insight about the mysterious hidden order phase displayed by the heavy fermion compound URu2Si2.