Magnetic phase diagram of La${}_{2-x}$Sr${}_x$CoO${}_4$ revised using muon-spin relaxation

Abstract

We report the results of a muon-spin relaxation ($\mu$SR) investigation of La${}_{2-x}$Sr${}_x$CoO${}_4$, an antiferromagnetic insulating series which has been shown to support charge ordered and magnetic stripe phases and an hourglass magnetic excitation spectrum. We present a revised magnetic phase diagram, which shows that the suppression of the magnetic ordering temperature is highly sensitive to small concentrations of holes. Distinct behavior within an intermediate $x$ range ($0.2\le x\lesssim 0.6$) suggests that the putative stripe ordered phase extends to lower $x$ than previously thought. Further charge doping ($0.67\le x\le 0.9$) prevents magnetic ordering for $T\gtrsim 1.5\mathrm{K}$

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Cited by in corpus (4)

• Direct evidence for charge stripes in a layered cobalt oxide
• Incommensurate spin correlations in highly oxidized cobaltates La${}_{2-x}$Sr${}_x$CoO${}_4$
• Possible stripe phases in the multiple magnetization plateaus in TbB${}_4$ derived from single-crystal neutron diffraction under pulsed high magnetic fields
• Stability of charge-stripe ordered La2-xSrxNiO4+delta at one third doping