Effect of heterovalent ion substitution on the crystalline structure and magnetic ordering of SrRuO3

Abstract

Structural and magnetic studies have been carried out on SrRu 1−x M x O 3 ͑M =Ga:x = 0.1; Cu and Zn: x = 0.1 and 0.2͒ in order to understand the dependence of the ferromagnetic transition temperature of SrRuO 3 on heterovalent magnetic and nonmagnetic cation substitution at the Ru site. Powder x-ray diffraction has been carried out to analyze the crystal structure using the Rietveld refinement procedure. T c decreases more rapidly for divalent cation dopants as compared to the trivalent cations. The refinement results show that there are distortions of the RuO 6 octahedra in the doped compounds, with little change in the lattice parameters. However, the direction and magnitudes of the tilt of the octahedra for all the compounds do not show correlation with the T c . Therefore, the change of T c is attributed to the charge and spin disorders introduced by the heterovalent dopant cations. The filled e g orbitals in Ga, Cu, and Zn ions are expected to have weak hybridization with the oxygen p orbitals as compared to the pristine compound, leading to a weakening of the overall ferromagnetic interactions between the Ru ions.

Synthesis, structures and properties of transition metal doped SrIrO3

“…Both Cu 2+ and Mn 3+ can be incorporated into SrRuO 3 , although the presence of the JT active cation is accompanied by a transition to a tetragonal structure. 15,29 Since both Zn 2+ and Ga 3+ have a d 10 electron conguration we explored the possibility of preparing samples of the type SrIr 1Àx Ga x O 3 for x ¼ 0.2, 0.33, 0.5, however we were unable to isolate single phase samples. Likewise attempts to introduce Al into SrIrO 3 were unsuccessful.…”

“…The structure was refined, from neutron diffraction data, in space group C2/c (no. 15) with a ¼ 5.60401(29), b ¼…”

Developing atomistic glass models using potential-free Monte Carlo method: From simple to complex structures

“…Basic steps involved in the rotation of a motif that is going to be placed at oxygen(r) are explained in Figure 1. In matrix notation the formula is given below 22 :…”