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Spin Stripe Order in a Square Planar Trilayer Nickelate



Junjie Zhang, D. M. Pajerowski, A. S. Botana, Hong Zheng, Leland Harriger, Jose Rodriguez Rivera, J. Ruff, N. J. Schreiber, B. Wang, Yu-Sheng Chen, Wangchun Chen, M. R. Norman, S. Rosenkranz, J. F. Mitchell, D. Phelan


Trilayer nickelates, which exhibit a high degree of orbital polarization combined with an electron (d8.67) corresponding to overdoped cuprates, have been recognized as promising candidates 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, but a longstanding issue has been the origin of an anomaly in the magnetic susceptibility at the transition and whether it signifies 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 uncorrelated along the crystallographic c-axis. Comparison of the charge and spin stripe order parameters reveals that, in contrast to single-layer nickelates such as La2-xSrxNiO4 as well as the majority of oxides including manganites, cobalates, and cuprates, these orders simultaneously appear, thus demonstrating a stronger coupling between spin and charge.
Physical Review Letters


Neutron Scattering, Nickelates, Superconductivity, Charge Stripe Order, Spin Stripe Order


Zhang, J. , Pajerowski, D. , Botana, A. , Zheng, H. , Harriger, L. , Rodriguez Rivera, J. , Ruff, J. , Schreiber, N. , Wang, B. , Chen, Y. , Chen, W. , Norman, M. , Rosenkranz, S. , Mitchell, J. and Phelan, D. (2019), Spin Stripe Order in a Square Planar Trilayer Nickelate, Physical Review Letters, [online], (Accessed July 21, 2024)


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Created June 17, 2019, Updated October 12, 2021