Growth of Sr₆Rh₅O₁₅ Single Crystals from High-Temperature Solutions:  Structure Determination Using the Traditional 3-D and the 4-D Superspace Group Methods and Magnetic Measurements on Oriented Single Crystals

Abstract

Single crystals of Sr6Rh5O15 were grown from a molten potassium carbonate flux. The structure was solved by both the traditional 3-D crystallographic approach and the 4-D superspace group approach using JANA2000. Both methods produced an equivalent structure determination, thereby confirming the 4-D superspace group approach as an effective structure solution method for 3-D commensurate composite structures. Sr6Rh5O15 corresponds to the n = 1, m = 1 member of the A3n+3mA'nB3m+nO9m+6n family of 2H hexagonal perovskite-related oxides. This compound is characterized by pseudo-one-dimensional polyhedral chains of four face-sharing RhO6 octahedra followed by one RhO6 trigonal prism. These chains in turn are separated by [Sr](infinity) chains. Magnetic measurements were carried out on oriented single crystals, and a very large magnetic anisotropy in the magnetic susceptibility was observed.

Spin‐flip transition and non‐one‐dimensional magnetic coupling in quasi‐one‐dimensional oxygen deficient Sr6Co5O15–δ

“…At 12 K, when the direction of the magnetic field parallel to the c-axis, in the low-field region, the magnetization shows a nearly linear increase with increasing magnetic field, and then a spin-flip transition is observed at a magnetic field around 7 T. However, in the case of the magnetic-field direction perpendicular to the c-axis, the magnetization increases almost linearly. The observed large anisotropy is similar to the results of susceptibility measurement of Sr 6 Co 5 O 14.7 [19] and Sr 6 Rh 5 O 15 [28].…”

Magnetic properties ofSr3NiIrO6andSr3CoIrO6: Magnetic hysteresis with coercive fields of up to 55 T

“…1(b)] [13]. Ni 2+ is surrounded by a trigonal bipyramid of oxygen atoms, while the Ir 4+ ion sits in a distorted octahedral oxygen cage [11,13,18]. Magnetic frustration is intrinsic to such a structure, and can result from antiferromagnetic interactions within the triangular lattice in the ab plane, and from frustration between nearest-neighbor and next-nearest-neighbor interactions along the c-axis chains [11,14,[19][20][21].…”

“…In the latter compound, the magnetic wave function is referred to as a J eff = 1 2 state, where J eff is an effective total angular momentum. However, as already noted, compared to Sr 2 IrO 4 , which has an octahedral oxygen cage around the Ir 4+ ion [1,27], the oxygen cages in Sr 3 NiIrO 6 and Sr 3 CoIrO 6 are trigonally distorted [11,13,18]. Recently, resonant inelastic x-ray scattering (RIXS) measurements were combined with electronicstructure calculations incorporating noncubic crystal-field effects and spin-orbit coupling [10]; these calculations [see schematic in Fig.…”

“…Soon after their synthesis [12], it was realized [13,14] that the interplay of electron correlations, magnetic frustration, reduced dimensionality, and magnetocrystalline anisotropy could lead to interesting physics; subsequently the structural and magnetic properties have been the subject of several studies (e.g., Refs. [13][14][15][16][17][18]). The salient structural details [11,13,15,18] are shown in Figs.…”

“…[13][14][15][16][17][18]). The salient structural details [11,13,15,18] are shown in Figs. 1(a) and 1(b) for Sr 3 NiIrO 6 .…”