Single Crystal Growth of Pure Co3+ Oxidation State Material LaSrCoO4

Abstract

Abstract:We report on the single crystal growth of the single-layer perovskite cobaltate LaSrCoO 4 that was grown by the optical floating zone method using high oxygen pressures. Phase purity and single crystallinity were confirmed by X-ray diffraction techniques. The pure Co 3+ oxidation state was confirmed by X-ray absorbtion spectroscopy measurements. A transition to a spin glass state is observed at ∼7 K in magnetic susceptibility and specific heat measurements.

Correlation between Structural and Transport Properties of Ca-Doped La Nickelates and Their Electrochemical Performance

“…Oxides with a perovskite-related Ruddlesden-Popper (R-P) structure, particularly Ln 2 NiO 4+δ (Pr, Nd, La), have been reported to have high levels of mixed ionic and electronic conductivity in addition to fast oxygen transport [1][2][3][4][5]. Such properties are among the main requirements for oxygen separation membranes and air electrodes of intermediate temperature electrochemical devices [6][7][8][9][10][11].…”

Review on quasi-2D square planar nickelates

“…oxygen, nitrogen, etc. ), floating zone techniques have brought new opportunities in exploration of novel quantum states and become an expanding frontier in new materials synthesis and discovery 13,15,33,47,[99][100][101][102][103][104] . Specifically, most inert (e.g.…”

Pressure-induced spin-state ordering in Sr$_2$CoO$_3$F

“…Ferromagnetism is observed also in strained films of LaCoO 3 [5,6], although its insulating character suggests that a different mechanism is at play. In the layered perovskite LaSrCoO 4 lowtemperature spin glass behavior was reported [7]. Compounds from the (Pr 1−y Y y ) x Ca 1−x CoO 3 family exhibit a 'hidden' order at temperatures as high as 130 K, which breaks time-reversal symmetry, but does not exhibit ordered moments [8,9].…”

“…In contrast, Sr 2 CoO 3 F, a recently synthesized compound [20], contains HS Co 3+ ions that order antiferromagnetically below T N = 323 K at ambient pressure [21]. Unlike its layered analog LaSrCoO 4 [7], Sr 2 CoO 3 F is free from structural disorder. Under pressure, the ground-state configuration changes from HS to LS.…”