The magnetic properties of iridium in mixed-metal oxides

Temperature and composition dependence of crystal structures and magnetic and electronic properties of the double perovskitesLa2−xSrxCoIrO6Narayanan1, Mikhailova2, Senyshyn3 et al. 2010Phys. Rev. B8413651View full textAdd to dashboardCite

“…The temperature dependence of resistivity was also measured in an external magnetic field of B =1 T. No significant magnetoresistance effect was detected nor any anomalies at the magnetic-ordering temperatures. Similar systematic investigations of the influence of the A-site cation on the transport properties of double perovskites are reported for La 1+x Sr 1−x CoRuO 6 …”

“…4,5 Much later crystal structures and magnetic properties were determined for B = Mn, Co, Ni, and Zn and bandstructure calculations ͓only local-density approximation ͑LDA͔͒ were performed for B = Mn, Co, and Fe. [6][7][8] At room temperature the double perovskites with B = Co, Ni, and Zn adopt a monoclinic P2 1 / n superstructure while the underlying space group of La 2 MnIrO 6 was not determined. A high degree of cation disorder, i.e., an occupation of the B site with BЈ and vice versa, was also reported for the compounds La 2 BIrO 6 with B = Mn and Fe due to the small differences in charge and ionic radii between the B and BЈ = Ir ions.…”

The crystal growth and magnetic properties of Ln2LiIrO6 (Ln=La, Pr, Nd, Sm, Eu)

“…It is known that Ir(V) has a nonmagnetic ground state and, therefore, at low temperatures contributes very little to the magnetic susceptibilities [9,10,23] of Pr 2 LiIrO 6 , Nd 2 LiIrO 6 , Sm 2 LiIrO 6 , and Eu 2 LiIrO 6 , which are dominated by the magnetism of the rare earth cations. At higher temperatures, however, the Ir(V) species does contribute to the susceptibility, which is not negligible for Eu 2 LiIrO 6 and important for Sm 2 LiIrO 6 .…”

“…Magnetic measurements were not performed for La 2 LiIrO 6 as the magnetic properties have been previously published [9,10]. The samples were measured under both zero field cooled (ZFC) and field cooled (FC) conditions in applied fields of 1 and 10 kG over the temperature range of 2 KpTp300 K. The samples were contained in gel capsules suspended in a plastic straw for immersion into the SQUID.…”

Structural Chemistry and Electronic Properties of the Hexagonal Perovskites BaIr1−xCoxO3−δ (x=0.5, 0.7, 0.8)

“…Although the system adopts the structure of the 6H polymorph (in the notation of (1)) for all values of x, the magnetic behavior changes progressively from that of a weak ferromagnet (x"0) to that of an antiferromagnet (x"2). The observation of a spontaneous magnetization (¹ "108 K) in Ba CoIr O was particularly interesting in view of the ferromagnetism of metallic BaIrO \B (8), and led us to investigate other mixed Co/Ir perovskites (6,9). In this paper we describe the structural and magnetic properties of three di!erent perovskite polymorphs in the system BaIr \V Co V O \B .…”