Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 113, Issue 32, Pages 8945-8950Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1606637113
Keywords
charge stripe; charge order; nickelate; strongly correlated materials; transition metal oxides
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Funding
- US Department of Energy, Office of Science, Basic Energy Sciences, Materials Science and Engineering Division
- Divisions of Chemistry (CHE) and Materials Research (DMR), National Science Foundation [NSF/CHE-1346572]
- US DOE [DE-AC02-06CH11357]
- Division Of Chemistry
- Direct For Mathematical & Physical Scien [1346572] Funding Source: National Science Foundation
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The quasi-2D nickelate La4Ni3O8 (La-438), consisting of trilayer networks of square planar Ni ions, is a member of the so-called T' family, which is derived from the Ruddlesden-Popper (R-P) parent compound La4Ni3O10-x by removing two oxygen atoms and rearranging the rock salt layers to fluorite-type layers. Although previous studies on polycrystalline samples have identified a 105-K phase transition with a pronounced electronic and magnetic response but weak lattice character, no consensus on the origin of this transition has been reached. Here, we show using synchrotron X-ray diffraction on high-pO(2) floating zone-grown single crystals that this transition is associated with a real space ordering of charge into a quasi-2D charge stripe ground state. The charge stripe superlattice propagation vector, q = (2/3, 0, 1), corresponds with that found in the related 1/3-hole doped single- layer R-P nickelate, La5/3Sr1/3NiO4 (LSNO-1/3; Ni2.33+), with orientation at 45 degrees to the Ni-O bonds. The charge stripes in La-438 are weakly correlated along c to form a staggered ABAB stacking that reduces the Coulomb repulsion among the stripes. Surprisingly, however, we find that the charge stripes within each trilayer of La-438 are stacked in phase from one layer to the next, at odds with any simple Coulomb repulsion argument.
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