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Spin Stripe Order in a Square Planar Trilayer Nickelate

Journal Article · · Physical Review Letters
 [1];  [2];  [3];  [4];  [5];  [6];  [7];  [7];  [4];  [8];  [6];  [4];  [4];  [4];  [4]
  1. Argonne National Lab. (ANL), Argonne, IL (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  3. Argonne National Lab. (ANL), Argonne, IL (United States); Arizona State Univ., Tempe, AZ (United States)
  4. Argonne National Lab. (ANL), Argonne, IL (United States)
  5. National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States)
  6. National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States); Univ. of Maryland, College Park, MD (United States)
  7. Cornell Univ., Ithaca, NY (United States)
  8. Univ. of Chicago, IL (United States)
In this study, trilayer nickelates, which exhibit a high degree of orbital polarization combined with an electron count (d8.67) corresponding to overdoped cuprates, have been identified as a promising candidate platform for achieving high-Tc superconductivity. One such material, La4Ni3O8, undergoes a semiconductor-insulator transition at ∼105 K, which was recently shown to arise from the formation of charge stripes. However, an outstanding issue has been the origin of an anomaly in the magnetic susceptibility at the transition and whether it signifies the formation of spin stripes akin to single layer nickelates. Here we report single crystal neutron diffraction measurements (both polarized and unpolarized) that establish that the ground state is indeed magnetic. The ordering is modeled as antiferromagnetic spin stripes that are commensurate with the charge stripes, the magnetic ordering occurring in individual trilayers that are essentially uncorrelated along the crystallographic c axis. Lastly, a comparison of the charge and spin stripe order parameters reveals that, in contrast to single-layer nickelates such as La2-xSrxNiO4 as well as related quasi-2D oxides including manganites, cobaltates, and cuprates, these orders uniquely appear simultaneously, thus demonstrating a stronger coupling between spin and charge than in these related low-dimensional correlated oxides.
Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1528697
Alternate ID(s):
OSTI ID: 1532474
OSTI ID: 1546408
Journal Information:
Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 24 Vol. 122; ISSN 0031-9007; ISSN PRLTAO
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Hund's metal physics: From SrNiO 2 to LaNiO 2 journal October 2020

Figures / Tables (4)


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