Electronic structures and magnetic properties in Sr_1-xLa_xRuO₃(0.0⩽x⩽0.5)

Abstract

In order to find out more about the suppression of ferromagnetic (FM) interactions in Sr1-xLaxRuO3, electronic structures and magnetic properties have been investigated upon changing x from 0.0 to 0.5, using an XRD method with Rietveld analysis, a SQUID magnetometer and a DV-Xα computational method. In comparison with magnetic properties in Sr1-xCaxRuO3, FM interactions in Sr1-xLaxRuO3 are found to be suppressed very rapidly against x. Neither structural distortion nor cation-size disorder can account for such rapid suppression. Instead, this may be attributed to the effect of La-O hybridization created by La substitution for Sr. This hybridization effect weakens the FM order around Ru ions and, as a result, the long-range FM states are suppressed even if x is small. The DV-Xα cluster method was employed to estimate the energy difference between the up and down spin density of states in SrRuO3 and Sr0.5La0.5RuO3. This calculation predicts that Sr1-xLaxRuO3 contains La-O hybridization which suppresses FM interaction even at small x.

Ferromagnetic transition in the correlated4dperovskitesSrRu1−xRhYamaura1, Young2, Takayama‐Muromachi3 2004Phys. Rev. B253210View full textAdd to dashboardCite

“…The La data were quoted from two independent reports. 32,33 As shown in the plots, the two sets of La data are entirely consistent with each other, and clearly reveal that the La substitution for Sr remarkably changes the unit-cell size. In the La plots an anisotropic change of the unit-cell appears (approximately -1.4% along the a-axis, nearly zero along the b-axis, and 4.5% along the caxis), which might reflect a change in the Ru-O-bond distances as well as the degree of cooperative rotations of the RuO 6 octahedra.…”

“…This fact probably provides an advantage for the present investigation, because the influence of local-structure distortions is remarkably reduced over the whole Rh concentration, as the relation of the distortion to the magnetic order was frequently focused on as a significant issue in many experimental and theoretical studies. 9,14,15,32,34,35,36,37 The magnetic data for Sr(Ru,Rh)O 3 are presented in Figs.2 and 3. First, we shall focus on the end member SrRuO 3 (x=0.0).…”

Influence of Hydrostatic Pressure on Magnetic Properties of (Sr,La)(Ru,Cr,Mn)O3

“…The T C decreases to about 75 K for La 0.2 Sr 0.8 RuO 3 [7]. The substitution of Ru ion by Mn 4+ (d 3 ) eliminates one of the Ru t 2g electrons, weakens the itinerant character of the d electrons, and introduces antiferromagnetic (AFM) interactions.…”

“…Strong Ru t2g −O 2p hybridisation leads to an itinerant character of ferromagnetism in this compound, evidenced by metallic conductivity, reduced magnetic moment, and lack of saturation of magnetisation in dc field of 300 kOe [3,4]. Different substitutions in SrRuO 3 , namely, by lanthanide ions or alkaline earth ions at the A site [4][5][6][7] and 3d transition metal ions at the B site [8], result in rapid changes of magnetic properties. The heterovalent La 3+ substitution for Sr…”

Metal insulator transition and magnetotransport anomalies in perovskite SrIr0.5Ru0.5O3 thin films

“…[11][12][13][14][15] This replacement causes localized orbitals to hinder the hybridization of Ru orbitals and results in formation of spin clusters that affect both magnetism and transport. Recently, efforts have also been made to synthesize polycrystalline SrIrO 3 doped with 3d transition metals.…”