Dimensionality-driven metal–insulator transition in spin–orbit-coupled IrO 2
IrO 2 thin films with tunable electrical transport and magnetic behavior have been obtained through control of thickness.
77 NANOSCIENCE AND NANOTECHNOLOGY↗
Engineering topics
Piquer, C.
Publications and source records attributed to Piquer, C..
Magnetism of Ir 5 + -based double perovskites: Unraveling its nature and the influence of structure
A combination of x-ray-diffraction, x-ray absorption, x-ray magnetic circular dichroism, macroscopic magnetization, and muon-spin relaxation measurements is used to investigate the interplay between structure (both crystallography and microstructure) and magnetism in Sr 2 YIrO 6 as a function of both chemical (Ca-doping) and physical (hydrostatic) pressure. X-ray absorption spectroscopy clearly shows that the physical pressure is more effective in modifying the structure. On the other hand, the dichroic measurements evidence a constant magnetic signal with physical pressure and strong differences with Ca-doping. Muon-spin relaxation reveals the presence of magnetic order, even when this is hidden in the magnetization data. From the combined analysis, the magnetic results are explained in terms of the presence of Ir 6+ or Ir 4+ ions in magnetic clusters, most likely located at and triggered by antisite disorder. The measurements under high physical pressure indicate that the magnetic state is independent of the crystallographic details such as Ir-O distances and Ir-O-Y angles.
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND↗