Year: 2025
Type: preprint
Abstract: The bilayer nickelate La$_3$Ni$_2$O$_7$ has recently emerged as a high-temperature superconductor with unusual spin stripe order in its ambient pressure phase. We propose a microscopic Hamiltonian that faithfully reflects the crystalline symmetry of this system, with the primary aim of addressing its unconventional magnetism at ambient pressure. Using state-of-the-art density matrix renormalization group calculations, we show that $(π/2,π/2)$ spin stripe order arises in our model at sizable Hund's coupling $J_H$ from a hidden quasi-one-dimensionality and persists over a range of electron concentrations. In the more symmetric high-pressure regime, our model exhibits enhanced interlayer pairing tendencies when the interlayer antiferromagnetic coupling $J_{\bot}$ becomes sufficiently large. Our results provide a microscopic origin of the diagonal spin stripes and identify Hund's coupling $J_H$ and interlayer coupling $J_{\bot}$ as key ingredients governing magnetic order and pairing tendencies in La$_3$Ni$_2$O$_7$.
Source: arXiv (Cornell University)
DOI: 10.1103/zqg5-gzbq
Language: English
Subfield: Condensed Matter Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Awards: G1286251239, Emergent Phenomena in Quantum Systems Theory Center, G2371548206, G237429762, G3702897590, G4711507462, G5473946529, G5570207115, Jenseits Thermalisierung: Die Erforschung des mikroskopischen Ursprungs nichtthermischen Verhaltens in VielteilchenQuantenzuständen, G6550344761, G7283024673, G911061179, G969889393
OpenAlex ID: W7084626281
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