Charge Condensation and Lattice Coupling Drives Stripe Formation in Nickelates

Abstract

Revealing the predominant driving force behind symmetry breaking in correlated materials is sometimes a formidable task due to the intertwined nature of different degrees of freedom. This is the case for La2-xSrxNiO4+δ in which coupled incommensurate charge and spin stripes form at low temperatures. Here, we use resonant X-ray photon correlation spectroscopy to study the temporal stability and domain memory of the charge and spin stripes in La2-xSrxNiO4+δ. Although spin stripes are more spatially correlated, charge stripes maintain a better temporal stability against temperature change. More intriguingly, charge order shows robust domain memory with thermal cycling up to 250 K, far above the ordering temperature. These results demonstrate the pinning of charge stripes to the lattice and that charge condensation is the predominant factor in the formation of stripe orders in nickelates.

7 pages; accepted in Physical Review Letters

References in corpus (7)

• Theory of Intertwined Orders in High Temperature Superconductors
• Resonant Elastic Soft X-Ray Scattering
• Strong Superexchange in a $d^{9-\delta }$ Nickelate Revealed by Resonant Inelastic X-Ray Scattering
• Spin stripe order in a square planar trilayer nickelate
• Microscopic origin of diagonal stripe phases in doped nickelates
• Magnetization of La(2-x)Sr(x)NiO(4+ delta) (0 < x < 0.5) and observation of novel memory effects
• Static and fluctuating stripe order observed by resonant soft x-ray diffraction in La1.8Sr0.2NiO4

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• Evolution of the metallic state of LaNiO${}_3$/LaAlO${}_3$ superlattices measured by ${}^8$Li $\beta$-detected NMR
• Magnetic excitations and absence of charge order in the van der Waals ferromagnet Fe${}_{4.75}$GeTe${}_2$