Hour-glass magnetic excitations induced by nanoscopic phase separation in cobalt oxides La${}_{2-x}$Sr${}_x$CoO${}_4$

Abstract

The magnetic excitations in the cuprate superconductors might be essential for an understanding of high-temperature superconductivity. In these cuprate superconductors the magnetic excitation spectrum resembles an hour-glass and certain resonant magnetic excitations within are believed to be connected to the pairing mechanism which is corroborated by the observation of a universal linear scaling of superconducting gap and magnetic resonance energy. So far, charge stripes are widely believed to be involved in the physics of hour-glass spectra. Here we study an isostructural cobaltate that also exhibits an hour-glass magnetic spectrum. Instead of the expected charge stripe order we observe nano phase separation and unravel a microscopically split origin of hour-glass spectra on the nano scale pointing to a connection between the magnetic resonance peak and the spin gap originating in islands of the antiferromagnetic parent insulator. Our findings open new ways to theories of magnetic excitations and superconductivity in cuprate superconductors.

arXiv commentNature Communications 5, 5731 (2014)

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• Electronic phase separation: recent progress in the old problem
• Magnon spectrum of the helimagnetic insulator Cu2OSeO3
• Direct evidence for charge stripes in a layered cobalt oxide
• Incommensurate spin correlations in highly oxidized cobaltates La${}_{2-x}$Sr${}_x$CoO${}_4$
• CDW and similarity of the Mott-Insulator-to-Metal transition in cuprates with the gas to liquid-liquid transition in supercooled water
• Distinct nature of static and dynamic magnetic stripes in cuprate superconductors
• Cation spin and superexchange interaction in oxide materials below and above spin crossover under high pressure
• Direct Visualization of Spatial inhomogeneity of Spin Stripes Order in La1.72Sr0.28NiO4
• Functional Nanoscale Phase Separation and Intertwined Order in Quantum Complex Materials
• Dynamics of Phase Separated States in the Double Exchange Model
• Magnetic phase diagram of La${}_{2-x}$Sr${}_x$CoO${}_4$ revised using muon-spin relaxation
• Theoretical investigation of excitonic magnetism in LaSrCoO${}_4$
• Complex spin-density-wave ordering in La${}_4$Ni${}_3$O${}_{10}$
• Magnetic excitations of the charge stripe electrons below half doping in La(2-x)Sr(x)NiO4, x = 0.45 and x = 0.4
• Dislocations as a boundary between charge density wave and oxygen rich phases in a cuprate high temperature superconductor
• Stability of charge-stripe ordered La2-xSrxNiO4+delta at one third doping
• The flux dynamics behavior of the two competing high temperature superconducting phases in underdoped LaCuO4.06
• Complex lattice and charge inhomogeneity favoring quantum coherence in high temperature superconductors
• Lattice, Charge and Spin phase inhomogeneity in complex striped quantum matter
• Evolution of valence-specific spin states and local distortions in La${}_{2-x}$Sr${}_x$CoO${}_4$