Density waves in low-pressure bilayer nickelates
Abstract
The low-pressure phase diagram of La3Ni2O7 provides an important reference for understanding its pressure-induced high-temperature superconductivity. While the spin-density-wave transition at TSDW≈150 K is increasingly well established, the origin of the second density-wave transition at TDW≈130 K has remained unresolved. Here, we perform unrestricted Hartree-Fock calculations to investigate the potential origin of the second transition. {Within the orthorhombic phase, the degeneracy between possible ordering wavevectors at QY=(0,π) and at QX=(π,0) is lifted and the electronic system} develops a double-stripe spin-density wave with ordering vector QY=(0,π). We identify that the pure double stripe spin state is unstable in La3Ni2O7 towards a commensurate charge-density wave instability, which favors a spin-modulated double stripe order with intertwined charge and spin instabilities and establish the hierarchy of ordered states in La3Ni2O7. We further discuss our results in the context of available experimental literature and propose further experimental tests to elucidate the origin of the SDW/DW states in this system.
Versions
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BibTeX
@misc{braz2026density,
title = {{Density waves in low-pressure bilayer nickelates}},
author = {Lauro B. Braz and Steffen Bötzel and Frank Lechermann and Igor Plokhikh and Rustem Khasanov and Luis G. G. V. Dias da Silva and Ilya M. Eremin},
howpublished = {arXiv},
year = {2026},
month = aug,
doi = {10.48550/arxiv.2606.29527},
eprint = {2606.29527},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2606.29527},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Density waves in low-pressure bilayer nickelates
AU - Lauro B. Braz
AU - Steffen Bötzel
AU - Frank Lechermann
AU - Igor Plokhikh
AU - Rustem Khasanov
AU - Luis G. G. V. Dias da Silva
AU - Ilya M. Eremin
PY - 2026
DA - 2026/08/10
PB - arXiv
DO - 10.48550/arxiv.2606.29527
UR - https://arxiv.org/abs/2606.29527
AB - The low-pressure phase diagram of La_3Ni_2O_7 provides an important reference for understanding its pressure-induced high-temperature superconductivity. While the spin-density-wave transition at T_SDW≈150 K is increasingly well established, the origin of the second density-wave transition at T_DW≈130 K has remained unresolved. Here, we perform unrestricted Hartree-Fock calculations to investigate the potential origin of the second transition. {Within the orthorhombic phase, the degeneracy between possible ordering wavevectors at Q_Y=(0,π) and at Q_X=(π,0) is lifted and the electronic system} develops a double-stripe spin-density wave with ordering vector Q_Y=(0,π). We identify that the pure double stripe spin state is unstable in La_3Ni_2O_7 towards a commensurate charge-density wave instability, which favors a spin-modulated double stripe order with intertwined charge and spin instabilities and establish the hierarchy of ordered states in La_3Ni_2O_7. We further discuss our results in the context of available experimental literature and propose further experimental tests to elucidate the origin of the SDW/DW states in this system.
ER -