Crystal Structure and Magnetic Properties of 6H-Perovskite Ba3NdRu2O9

Spin orders and lattice distortions of geometrically frustrated 6H-perovskites Ba3B′Ru2OSenn1, Kimber2, Arévalo‐López3 et al. 2013Phys. Rev. B3510623View full textAdd to dashboardCite

“…7(a)] observed Table III. The refined magnitude of 1.56(7)μ B at 20 K is consistent with the previously published result obtained from neutron powder diffraction of 1.65(8) at 10 K. 11 No direct evidence for simultaneous ordering of Ru moments at T 1 is observed, although this is known to occur in materials such as the related double perovskite Ba 2 NdRuO 6 . 18 Fits to our data show that any ferromagnetically ordered Ru component has magnitude substantially lower than 0.4μ B .…”

“…11 Peak splittings consistent with the reported distortion from hexagonal P 6 3 /mmc to monoclinic C2/c symmetry at 120 K were observed in the low-temperature FIG. 3.…”

“…17 Magnetic neutron diffraction peaks were observed below the previously reported T 1 = 25 K and T 2 = 18 K magnetic transitions. 11 Magnetic diffraction peaks [ Fig. 7(a)] observed Table III.…”

“…B = R 3+ (rare earth) and Y 3+ materials have Néel transitions at T N < 28 K and remain hexagonal down to 2 K, 3,10 except for B = Nd 3+ in which a transition to C2/c symmetry has been reported at 120 K in addition to two low-temperature transitions, at T 1 = 24 and T 2 = 17 K, observed in magnetization and heat capacity measurements. 11 Broad features in magnetic susceptibility and specific heat measurements at high temperatures were interpreted as evidence for local antiferromagnetic pairing within Ru 2 O 9 dimers. 3 Previous neutron powder diffraction data revealed ferromagnetic ordering of Nd 3+ moment in Ba 3 Nd 3+ Ru 2 O 9 below T 1 , but the nature of the further order at T 2 was unclear.…”

Layered perovskite-related ruthenium oxychlorides: crystal structure of two new compounds Ba5Ru2Cl2O9 and Ba6Ru3Cl2O12

“…However, the distance remains significantly greater than the distance between two BaO 3 layers (about 2.4 Å ). For M 3+ , Ba 3 MRu 2 O 9 compounds have been reported for all the other lanthanide ions [35][36][37][38] and for M=Y, In [35,37,39], the MOD of Ru is +4.5 and the metal-metal bond remains strong, the Ru-Ru distance is in the range 2.52-2.56 Å . For M 2+ cations (M=Ni, Co, Zn, Cu [36,39,40] and M=Mg, Ca, Cd, Sr [41][42][43]), the ruthenium is Ru(V), the metalmetal bond, although weaker, remains strong (the RuRu distance is in the range 2.65-2.70 Å ).…”