Nanoscale inhomogeneity of charge density waves dynamics in La${}_{2-x}$Sr${}_x$NiO${}_4$

Abstract

While stripe phases with broken rotational symmetry of charge density appear in many complex correlated systems, the heterogeneity of spatial ordering and dynamics remains elusive. This missing info is at the heart of understanding the structure and function relation in quantum complex materials. We focus here on the spatial heterogeneity of the motion of charge density wave (CDW) at nanoscale in the archetypal case of La${}_{2-x}$Sr${}_x$NiO${}_{4+y}$ perovskite at low temperature. We report compelling evidence that the unconventional increasing motion of CDW at T < 50K is related with the decreasing of its correlation length using resonant soft X-ray photon correlation spectroscopy (XPCS). The key result of this work is the direct visualization of nanoscale spatial inhomogeneity of CDW relaxation dynamics by scanning micro X-ray diffraction (SmXRD) showing a nanoscale landscape of percolating short range dynamic CDW puddles competing with large quasi-static CDW puddles giving rise to a novel form of nanoscale phase separation of the incommensurate stripes order landscape.

15 pages, 3 figures

References in corpus (16)

• Direct observation of competition between superconductivity and charge density wave order in YBa2Cu3Oy
• Scale-free structural organization of oxygen interstitials in La2CuO4+y
• Optimum inhomogeneity of local lattice distortions in La2CuO4+y
• Inhomogeneous superconductivity and the "pseudogap state of novel superconductors
• Charge density waves in cuprate superconductors beyond the critical doping
• Direct observation of nanoscale interface phase in the superconducting chalcogenide K${}_x$Fe${}_{2-y}$Se${}_2$ with intrinsic phase separation
• Electronic phase separation: recent progress in the old problem
• Scanning micro X-ray diffraction unveils the distribution of oxygen chains nano-puddles in YBa2Cu3O6.33
• Multiscale distribution of oxygen puddles in 1/8 doped YBa2Cu3O6.67
• Intrinsic arrested nanoscale phase separation near a topological Lifshitz transition in strongly correlated two-band metals
• Enhanced electron-phonon coupling for charge-density-wave formation in La${}_{1.8-x}$Eu${}_{0.2}$Sr${}_x$CuO${}_{4+\delta }$
• Microscopic origin of diagonal stripe phases in doped nickelates
• Ubiquitous Charge Order Correlations in High-Temperature Superconducting Cuprates
• Charge Condensation and Lattice Coupling Drives Stripe Formation in Nickelates
• Measurement of spin dynamics in a layered nickelate using x-ray photon correlation spectroscopy: Evidence for intrinsic destabilization of incommensurate stripes at low temperatures
• X-rays writing/reading of Charge Density Waves in the CuO2 plane of a simple cuprate superconductor

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