Spin Stripe Order in a Square Planar Trilayer Nickelate.
Journal Article
·
· Physical Review Letters
Trilayer nickelates, which exhibit a high degree of orbital polarization combined with an electron count (d(8.67)) corresponding to overdoped cuprates, have been identified as a promising candidate platform for achieving high-T-c superconductivity. One such material, La4Ni3O8, undergoes a semiconductor-insulator transition at similar to 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. 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:
- Argonne National Laboratory (ANL)
- Sponsoring Organization:
- USDOE Office of Science - Office of Basic Energy Sciences - Materials Sciences and Engineering Division; USDOE Office of Science - Office of Basic Energy Sciences - Scientific User Facilities Division; National Science Foundation (NSF); National Institute of Standards and Technology (NIST)
- DOE Contract Number:
- AC02-06CH11357
- OSTI ID:
- 1532474
- Journal Information:
- Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 24 Vol. 122; ISSN 0031-9007
- Country of Publication:
- United States
- Language:
- English
Hund's metal physics: From SrNiO 2 to LaNiO 2
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