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Spin Stripe Order in a Square Planar Trilayer Nickelate
Junjie Zhang1,2, D M Pajerowski3, A S Botana1,4
1Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA.
Physical Review Letters
|July 20, 2019
Summary
Trilayer nickelates like La₄Ni₃O₈ show magnetic ordering forming antiferromagnetic spin stripes. These spin stripes appear simultaneously with charge stripes, indicating a strong spin-charge coupling in this promising superconductor candidate.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Solid-State Chemistry
Background:
- Trilayer nickelates are promising for high-temperature superconductivity due to orbital polarization and electron counts similar to cuprates.
- La₄Ni₃O₈ exhibits a semiconductor-insulator transition at ~105 K, attributed to charge stripe formation.
- The origin of magnetic susceptibility anomalies and potential spin stripe formation in La₄Ni₃O₈ remained unclear.
Purpose of the Study:
- To investigate the magnetic ground state of the trilayer nickelate La₄Ni₃O₈.
- To determine if magnetic ordering involves spin stripes and its relationship to charge stripes.
- To compare the spin-charge coupling in La₄Ni₃O₈ with other low-dimensional correlated oxides.
Main Methods:
- Single crystal neutron diffraction (polarized and unpolarized) was employed.
- Analysis focused on identifying magnetic ordering and its correlation with charge stripes.
- Charge and spin stripe order parameters were compared.
Main Results:
- The ground state of La₄Ni₃O₈ was confirmed to be magnetic.
- Antiferromagnetic spin stripes, commensurate with charge stripes, were identified.
- Magnetic ordering occurs within uncorrelated trilayers along the c-axis.
Conclusions:
- Spin and charge stripes in La₄Ni₃O₈ appear simultaneously, unlike in related oxides.
- This simultaneous emergence indicates a stronger spin-charge coupling in trilayer nickelates.
- La₄Ni₃O₈ presents a unique platform for studying spin-charge interplay in correlated oxides.
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