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The quasi-two-dimensional nickelate La4Ni3O8 (La-438) is an anion deficientn=3 Ruddlesden-Popper (R-P) phase that consists of trilayer networks of squareplanar Ni ions, formally assigned as Ni1+ and Ni2+ in a 2:1 ratio. Whileprevious studies on polycrystalline samples have identified a 105 K phasetransition with a pronounced electronic and magnetic response but weak latticecharacter, no consensus on the origin of this transition has been reached. Herewe show using synchrotron x-ray diffraction on high-pO2 floating-zone grownsingle crystals that this transition is driven by a real space ordering ofcharge into a quasi-2D charge stripe ground state. The charge stripesuperlattice propagation vector, q=(2/3, 0, 1), corresponds with that found inthe related 1/3-hole doped single layer Ruddlesden-Popper nickelate,La5/3Sr1/3NiO4 (LSNO-1/3, Ni2.33+) with orientation at 45-degrees to the Ni-Obonds. Like LSNO-1/3, the charge stripes in La-438 are weakly correlated alongthe c axis to form a staggered ABAB stacking that minimizes the Coulombrepulsion among the stripes. Surprisingly, however, we find that the chargestripes within each trilayer of La-438 are stacked in phase from one layer tothe next, at odds with any simple Coulomb repulsion argument.

Stacked Charge Stripes in Quasi-Two_Dimensional Trilayer Nickelate La4Ni3O8