Exploring spin/orbital patterns in correlated oxides

ISBN-13: 9783659485664 / Angielski / Miękka / 2013 / 192 str.

Forte Filomena

Opis

Transition metal oxides show unconventional and competing phenomena, including metal-insulator transitions, superconductivity, magnetic and orbital orderings, colossal magnetoresistance, all being realized in the presence of orbital degeneracy. A formidable example is provided by the Ruddlesden-Popper series ruthenates (Sr, Ca)n+1RunO3n+1. In this book, mean-field and numerical calculations are presented, based on a theoretical model describing layered Ca-based ruthenates. The mechanism that can give rise to the orbital pattern consistent with the Mott insulating and G-type antiferromagnetic phase in the single layer Ca2RuO4 is studied. Moreover, the response to a spin/orbital polarizing field is analyzed, in connection to the highly field-tunable transport properties of Ca3Ru2O7. The second part of this book is devoted to the description of Resonant Inelastic X-Ray Scattering (RIXS), as a powerful tool to detect low-lying-energy electronic excitations. The ultrashort lifetime limit expansion of the RIXS cross-section is introduced and used to demonstrate that RIXS can be related to general correlation functions measuring e.g. two-magnon excitations and multi-orbiton excitations.

O autorze

Forte, FilomenaDr. Filomena Forte is currently researcher of the Italian National Research Council (CNR), at the SPIN Institute. She earned her master degree cum laude and her Ph.D. degree in Solid State Physics at the University of Salerno (Italy). Her main research interests lie in Strongly Correlated Systems, Spin-Orbital Physics, Advanced Spectroscopies.