Proper and improper SrRuO 3 phase and corresponding itinerant ferromagnetic behavior

摘要: SrRuO 3 is a very important member of layered Ruddlesden-Popper series Sr n+1 Ru n O 3n+1 compounds; where (= 1, 2, and ∞) indicates number RuO 6 octahedral layers per formula unit. Structural, transport magnetic properties in vary with different values ‘n’. For example; 2 4 (n=1) possible p-wave spin-triplet superconductor [1], O7 (n=2) bilayered paramagnetic metal quantum criticality [2], 10 (n=3) structurally distorted ferromagnetic (or metamagnetic) [3] (n=∞) perovskite structured [4,5]. Due to its itinerant behavior ability easy epitaxial growth on many substrates, vastly used as conducting electrode multilayer device applications, tunnel junctions, electronic tuning, dynamic random access memory switchable acoustic wave resonators, spintronic devices more.31-38 The single crystals show long range ordering at 165 K (T C , Curie temperature) low temperature moment ∼1.6 μB/Ru [6-10]. But, achieving these experimentally for polycrystalline not due reasons such volatile nature . It has been reported earlier that vacancies created the deficiency responsible getting reduced T moment. In our experiment, it observed leading formation secondary 7 phase system. We increasing extended annealing. evolution accompanied change resistivity particular processing condition, it's ) high 164 ordered μ B /Ru achieved, which almost equal shown by crystal. Additionally, metal-metal transition be affected presence shows lowest system exhibits best response. This correlation ferromagnetism an indirect evidence itineration electrons. Moreover, crossover from Fermi liquid (FL) non-Fermi (NFL) like have all systems near 40–50 K.