Antiferromagnetic ordering in Sr₂CrO₄

Abstract

The magnetic ground state of Sr2CrO4 with a distorted honeycomb lattice was investigated by means of measurements of the magnetic susceptibility, high-field magnetization process, and electron spin resonance (ESR). Antiferromagnetic ordering was observed clearly below TN = 3.2 K, while the magnetic ground state had been thought to be a spin-singlet state. A two-sublattice model with biaxial anisotropy was applicable for the observed ESR modes. Plateau-like behavior and a sharp kink were detected in the magnetization curve.

Optical and magnetic properties of Gd1−x Sr x CrO3 (0 ⩽ x ⩽ 0.15)

“…Further, it has to be noted that the 3d transition metal ions in presence of alkaline ions at high temperature may initiate the platform for the evolution of various lower symmetric K 2 NiF 4 and K 3 Ni 2 F 7 -type structures. Nevertheless, according to the previous literature [27,28], it is difficult to synthesize Cr-based K 2 NiF 4 and K 3 Ni 2 F 7 -type compounds only at high temperature in ambient pressure; and, high pressure synthesis is necessary to successfully synthesize such hettotype K 2 NiF 4type structures. However, β-Sr 2 CrO 4 and monazite-type SrCrO 4 compounds can exist under ambient pressure, and can be synthesized under flowing oxygen gas at high temper ature and normal precipitation method, respectively [28,29].…”

“…Nevertheless, according to the previous literature [27,28], it is difficult to synthesize Cr-based K 2 NiF 4 and K 3 Ni 2 F 7 -type compounds only at high temperature in ambient pressure; and, high pressure synthesis is necessary to successfully synthesize such hettotype K 2 NiF 4type structures. However, β-Sr 2 CrO 4 and monazite-type SrCrO 4 compounds can exist under ambient pressure, and can be synthesized under flowing oxygen gas at high temper ature and normal precipitation method, respectively [28,29]. Still considering the possibility of formation of few percentages of such phases at the present synthesis condition, we have performed mixed phase refinement for x = 0.15 sample with the combination of orthorhombic phase of pristine GdCrO 3 and various lower symmetric structures by trial and error method, and obtained the best fitted result using orthorhombic phase of both GdCrO 3 and monazite-type structure of SrCrO 4 [30] (space group P2 1 /n) as displayed in the lower panel of figure 1 The variation of lattice parameters and unit cell volume related to the perovskite GdCrO 3 phase with the compositions are shown in figures 1(c) and (d), respectively.…”