part 2. Novel phenomena in 4d- and 5d-transition metal oxides. Spin-orbit interactions in Ruddlesden-Popper phases Sr[subfield n+1]Ir[subfield n]O[subfield 3n+1] (n = 1, 2, and ∞) ; Magnetic frustration ; Lattice-driven ruthenates ; Current control of structural and physical properties in spin-orbit- coupled Mott insulators