Synthesis and characterization of the new two-dimensional Heisenberg antiferromagnet double perovskite BaLaCuSbO₆

Abstract

The BaLaCuSbO(6) double perovskite has been successfully synthesized by solid state reaction under an air atmosphere. Its structure was refined using powder neutron diffraction in the monoclinic space group I2/m with a 4% antisite disorder on the B cations. Magnetic measurements give signs of 2D-antiferromagnetic behaviour with TN around 64 K. The Jahn-Teller distortion produced by Cu(2+) ions favours a crystallographic tetragonal distortion and consequently the in-plane super-superexchange antiferromagnetic interactions, J(90°), are favoured over the in-plane J(180°) antiferromagnetic exchange interactions. Both, J and J' magnetic interactions have been evaluated according to a Heisenberg antiferromagnetic rectangular model using an approximation to Curie's law in powers of J/T, being |J| around 10 times stronger than |J'|.

Chemical Substitution-Induced and Competitive Formation of 6H and 3C Perovskite Structures in Ba3–xSrxZnSb2O9: The Coexistence of Two Perovskites in 0.3 ≤ x ≤ 1.0

“…Woodward and his co-workers proposed that the allowed space groups for B-site ordered perovskite in the monoclinic system include C 2/ c , P 2 1 / c , and C 2/ m ( I 2/ m with a different cell choice) . Considering the group–subgroup relationship and the extinction condition of the XRD patterns, we found the most probable space group in our case was I 2/ m , although it was rarely seen; for instance, only a few Sb 5+ -based perovskites LaBaMSbO 6 (M = Mn 2+ , Ni 2+ , Cu 2+ , Zn 2+ ) possess this space group. ,,, …”

Diamagnetic d-Orbitals Drive Magnetic Structure Selection in the Double Perovskite Ba2MnTeO6

“…Sr 2 FeSbO 6 with partial cation ordering of Fe 3+ and the d 0 Sb 5+ , for instance, does have the expected Type I structure, but the B-sites are disordered in the Nb 5+ and Ta 5+ d 0 analogues leading to spin glass states. , Similarly, Sr 2 CrSbO 6 is a Type I antiferromagnet while the more distorted Ca 2 CrSbO 6 with larger octahedral tilting becomes ferromagnetic . SrLaNiSbO 6 and BaLaCuSbO 6 have the expected Type I and Néel magnetic structures, respectively. , …”

“…68 SrLaNiSbO 6 and BaLaCuSbO 6 have the expected Type I and Neél magnetic structures, respectively. 69,70 The d 10 /d 0 effect explains the observed magnetic structures in a large number of 3d transition metal double perovskites. This does not appear to be the case for 4d and 5d double perovskites, which have significant spin−orbit coupling and reduced on-site Coulombic repulsion compared to 3d transition metals.…”

“…59 SrLaNiSbO6 and BaLaCuSbO6 have the expected Type I and Néel magnetic structures, respectively. 60,61 Differences between d 10 Zn 2+ and Cd 2+ and d 0 Ca 2+ Ba2B'OsO6 Os 6+ (5d 2 ) compounds have also been reported, but the magnetic structures are not known. 18 Curiously, the Os 5+ (5d 3 ) perovskites Sr2B'OsO6 with d 10 Sc 3+…”

Tuning the S=1/2 square-lattice antiferromagnet Sr2Cu(TMustonen1, Vasala2, Schmidt3 et al. 2018Phys. Rev. B452550View full textAdd to dashboardCite

“…The QSL state on the square lattice is predicted to occur in a narrow parameter range between J2/J1 ≈ 0.4-0.6, where the magnetic frustration due to competing antiferromagnetic J1 and J2 interactions is maximized [6][7][8] . A limited number of model compounds that realize the S = 1/2 square-lattice Heisenberg model are known [9][10][11][12][13][14][15][16][17][18][19] , but none of them are in the spin liquid region of the phase diagram (Fig. 1a).…”