Crystal structures and magnetic properties of ordered perovskites Sr₂LnRuO₆(Ln = Eu-Lu)

Abstract

The perovskite-type compounds Sr2LnRuO6 (Ln = Eu-Lu) have been synthesized, and their crystal structures and magnetic properties have been investigated. Powder x-ray diffraction measurements and the Rietveld analysis show that they are monoclinic with space group P21/n and that Ln3+ and Ru5+ ions are structurally ordered. These compounds show complex magnetic transitions at low temperatures. These transitions are considered to be antiferromagnetic ones from large negative Weiss constants. Below the transition temperatures, there is a large difference in the temperature dependence of the magnetic susceptibility measured under the zero-field cooled condition and under the field cooled condition, which shows the existence of a weak ferromagnetic moment associated with the antiferromagnetism.

Crystal structures and magnetic properties of lanthanide containing borates LnM(BO3)2 (Ln=Y, Ho–Lu; M=Sc, Cr)

“…Such a structural feature has been of great interest in the sight of the magnetism because the existence of Ln-O-Cr superexchange pathway may bring about anomalous magnetic properties due to the magnetic interaction between f and d electrons which has been reported for ordered double perovskites A 2 LnMO 6 (A = alkali earth; M = 4d, 5d transition metal) [6][7][8][9][10]. Nevertheless, the physical properties of LnCr(BO 3 ) 2 are unknown although long time has passed since first synthesis to our best knowledge.…”

High-temperature thermoelectric properties of the double-perovskite ruthenium oxide (Sr1−xLax)2ErRuO6

“…[15][16][17][18][19] In addition, a possible high-temperature superconductivity has been discussed in Sr 2 LRu 1−x Cu x O 6 .…”

Antiferromagnetic transitions of osmium-containing rare earth double perovskites Ba2LnOsO6 (Ln=rare earths)

“…Such highly oxidized cations from the second or third transition series sometimes show quite unusual magnetic behavior. Any of the double perovskites Ba 2 LnRuO 6 (Ln = La ~ Lu) [2,4,5,[9][10][11][12] and Sr 2 LnRuO 6 (Eu ~ Lu) [3,4,[6][7][8][12][13][14] show an antiferromagnetic transition at low temperatures, and the transition temperature is higher than that for the compounds in which the magnetic ion at the B site is Ru 5+ ion only. Among them, the transition temperature for Ba 2 PrRuO 6 is astonishingly as high as 117 K [10], and Ba 2 NdRuO 6 transforms to the antiferromagnetic state at 57 K [9].…”

“…Not the A site ions but the B site ions normally determine the physical properties of the perovskites [1] The solid-state chemistry of such mixed-metal oxides containing platinum group metals has attracted a great deal of interest. The preparation, crystal structures and magnetic properties of double perovskite oxides containing Ru ion, A 2 LnRuO 6 (A = alkali-earth metals), where Ln represents a rare earth ion, have been studied [2][3][4][5][6][7][8][9][10][11][12][13][14]. The electronic configuration of Ru 5+ is…”