Stripe disorder and dynamics in the hole-doped antiferromagnetic insulator La5/3Sr1/3CoO4

Abstract

We report on an investigation into the dynamics of the stripe phase of La5/3Sr1/3CoO4, a material recently shown to have an hour-glass magnetic excitation spectrum. A combination of magnetic susceptibility, muon-spin relaxation and nuclear magnetic resonance measurements strongly suggest that the physics is determined by a disordered configuration of charge and spin stripes whose frustrated magnetic degrees of freedom are strongly dynamic at high temperature and which freeze out in a glassy manner as the temperature is lowered. Our results broadly confirm a recent theoretical prediction, but show that the charge quenching remains incomplete well below the charge ordering temperature and reveal, in detail, the manner in which the magnetic degrees of freedom are frozen.

5 pages, 4 figures. (Revised data analysis, discussion and supplemental information is now included)

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Cited by in corpus (10)

• Hour-glass magnetic excitations induced by nanoscopic phase separation in cobalt oxides La${}_{2-x}$Sr${}_x$CoO${}_4$
• Direct evidence for charge stripes in a layered cobalt oxide
• Incommensurate spin correlations in highly oxidized cobaltates La${}_{2-x}$Sr${}_x$CoO${}_4$
• Effective decoupling of ferromagnetic sublattices by frustration in Heusler alloys
• Local magnetism, magnetic order and spin freezing in the 'nonmetallic metal' FeCrAs
• Possible stripe phases in the multiple magnetization plateaus in TbB${}_4$ derived from single-crystal neutron diffraction under pulsed high magnetic fields
• Elementary excitation in the spin-stripe phase in quantum chains
• Magnetic phase diagram of La${}_{2-x}$Sr${}_x$CoO${}_4$ revised using muon-spin relaxation
• Study of long-range orders of hard-core bosons coupled to cooperative normal modes in two-dimensional lattices
• Investigation of spin-phonon coupling and local magnetic properties in magnetoelectric Fe2TeO6