Assistant Professor,  University of São Paulo, São Paulo, Brazil.
Physics Institute,  Department of Applied Physics
Phone: +55 11 3091 70 70
Email: fgarcia-at-if.usp.br

Research interests
X-ray spectroscopy of quantum materials
  • Magnetism and structure in itinerant magnets
  • Magnetism and structure in frustrated magnets

2018 -  Nosso grupo est
á recrutando estudantes interessadxs em projetos experimentais e teóricos. Veja aqui possíveis projetos!

2018 - New papers !!!

          A new spin liquid candidate

            Magnetic interactions can be frustrated.  In saying that we mean that it is possible that not all constraints dictated by the kind of magnetic  interaction will be satisfied in a given system. As an example, think of spins in a triangular lattice or, to be more precise, think of spins in the corners of a equilateral triangle. Suppose now that the spins interact antiferromagnetically or, in plain words, that the interactions dictate that they must be anti aligned. You can arrange two of the spins like that.  But what about the third? For the third spin, you must choose either of the other two  to satisfy the anti alignment rule! You cannot satisfy both constraints at the same time. This is an example of a geometric frustration (you can learn more here).

             The main effect of frustration is to suppress order. In some cases, the system is strongly frustrated and long range magnetic order is not observed down to the lowest temperatures. This lack of long range order creates a problem: what happens with the system entropy? The third law of thermodynamics states that the variation of entropy must go to zero while approaching the ground state. A magnetic ordered state has zero entropy and thus fulfills the requirement of the third law, but if frustration suppresses order, something else must occur. 
             One such thing is the formation of a spin liquid state. Such state is a quantum many body state of highly entangled spins. The ground state is dynamical but exhibits correlation and the entropy of the system is fully recovered. In our paper, we propose a new candidate to host such exotic ground state. This paper is part of the Marter's work of Marli Cantarino, a student in our group. 

             M.R. Cantarino, R.P. Amaral, R.S. Freitas, J.C.R. Araújo, R. Lora-Serrano, H. Luetkens, C. Baines, S. Bräuninger, V. Grinenko, R. Sarkar, H.H. Klauss, E. C. Andrade, F. A. Garcia - "Spin Liquid Behavior in the Disordered Double Perovskite BaTi1/2Mn1/2O3" (arXiv:1802.09950)

2014 - present - Assistant Professor - University of São Paulo, São Paulo, Brazil
2012 - 2014 - Pos-doc researcher - UNICAMP, Campinas, Brazil
2011 - 2012 - Pos-doc researcher - Max Plack Institute - CPFS,  Dresden, Germany

2007 - 2010 -  Doctor of Sciences - UNICAMP, Campinas, Brazil

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