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Mechanism of the additional spin-density-wave order in La4Ni3O10

Ascertain the mechanism responsible for the additional spin-density-wave order at T_SDW2 ≈ 80 K in La4Ni3O10, distinguishing among spin reorientation, phase separation, or other phenomena.

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Background

Trilayer La4Ni3O10 exhibits intertwined charge and spin density waves in the low-pressure phase and superconductivity under high pressure. Two μSR studies report an additional SDW onset near 80 K.

The authors explicitly note that the underlying mechanism of this lower-temperature SDW is still unclear and suggest several possible scenarios that require resolution.

References

However, the underlying mechanism, whether involving a spin reorientation, a phase separation or other phenomena, still remains unclear .

— Recent progress in nickelate superconductors (2509.08386 - Wang et al., 10 Sep 2025) in Section 4.1 (43(10))