Hour-glass magnetic spectrum in an insulating, hole-doped antiferromagnet

Abstract

Superconductivity in layered copper-oxide compounds emerges when charge carriers are added to antiferromagnetically-ordered CuO2 layers. The carriers destroy the antiferromagnetic order, but strong spin fluctuations persist throughout the superconducting phase and are intimately linked to super-conductivity. Neutron scattering measurements of spin fluctuations in hole-doped copper oxides have revealed an unusual `hour-glass' feature in the momentum-resolved magnetic spectrum, present in a wide range of superconducting and non-superconducting materials. There is no widely-accepted explanation for this feature. One possibility is that it derives from a pattern of alternating spin and charge stripes, an idea supported by measurements on stripe-ordered La1.875Ba0.125CuO4. However, many copper oxides without stripe order also exhibit an hour-glass spectrum$. Here we report the observation of an hour-glass magnetic spectrum in a hole-doped antiferromagnet from outside the family of superconducting copper oxides. Our system has stripe correlations and is an insulator, which means its magnetic dynamics can conclusively be ascribed to stripes. The results provide compelling evidence that the hour-glass spectrum in the copper-oxide superconductors arises from fluctuating stripes.

arXiv comment13 pages, 4 figures, to appear in Nature

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• Progress in Neutron Scattering Studies of Spin Excitations in High-Tc Cuprates
• Stacked Charge Stripes in Quasi-Two_Dimensional Trilayer Nickelate La4Ni3O8
• Materials Design for New Superconductors
• Dominant Kitaev interactions in the honeycomb materials Na${}_3$Co${}_2$SbO${}_6$ and Na${}_2$Co${}_2$TeO${}_6$
• Spin stripe order in a square planar trilayer nickelate
• Empirical Magnetic Structure of Frustrated Spin Systems
• Neutron scattering studies on stripe phases in non-cuprate materials
• Hour-glass magnetic excitations induced by nanoscopic phase separation in cobalt oxides La${}_{2-x}$Sr${}_x$CoO${}_4$
• Influence of long-range interactions on charge ordering phenomena on a square lattice
• Superconductivity in high-$T_c$ and related strongly correlated systems from variational perspective: Beyond mean field theory
• Magnon spectrum of the helimagnetic insulator Cu2OSeO3
• Direct evidence for charge stripes in a layered cobalt oxide
• Hour-glass magnetic spectrum in a stripe-less insulating transition metal oxide
• Soft striped magnetic fluctuations competing with superconductivity in Fe_{1+x}Te
• Competing itinerant and local spin interactions in kagome metal FeGe
• The Magnetic Structure of Paramagnetic MnO
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• Incommensurate spin correlations in highly oxidized cobaltates La${}_{2-x}$Sr${}_x$CoO${}_4$
• (PI,0) antiferromagnetic spin excitations in superconducting Rb0.82Fe1.68Se2
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• Stripe disorder and dynamics in the hole-doped antiferromagnetic insulator La5/3Sr1/3CoO4
• Stripes in cuprate superconductors: Excitations and dynamic dichotomy
• Magnetic hour-glass dispersion and its relation to high-temperature superconductivity in iron-tuned Fe${}_{1+y}$Te${}_{0.7}$Se${}_{0.3}$
• Hourglass dispersion in overdoped single-layered manganites
• Energy-dependent crossover from anisotropic to isotropic magnetic dispersion in lightly-doped La1.96Sr0.04CuO4
• The Hour-Glass Magnetic Spectrum Arising from a Striped, Cluster Spin Glass Ground State in La1.75Sr0.25CoO4
• Magnetic phase diagram of La${}_{2-x}$Sr${}_x$CoO${}_4$ revised using muon-spin relaxation
• 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
• Electronic transport through correlated electron systems with nonhomogeneous charge orderings
• Study of long-range orders of hard-core bosons coupled to cooperative normal modes in two-dimensional lattices
• Violation of Luttinger's theorem in the simplest doped Mott insulator: Falicov-Kimball model in strong correlation limit
• Evolution of valence-specific spin states and local distortions in La${}_{2-x}$Sr${}_x$CoO${}_4$
• Variational Monte Carlo study of spin dynamics in underdoped cuprates
• Inverse Melting of an Electronic Liquid Crystal