Spin density wave and superconductivity in the bilayer t−J model of La3Ni2O7 under renormalized mean-field theory

Yang Tian; Yan Chen

doi:10.1103/c6b5-4dkj

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Spin density wave and superconductivity in the bilayer t−J model of La3Ni2O7 under renormalized mean-field theory

Yang Tian, Yan Chen

DOI 10.1103/c6b5-4dkj · Physical Review B

T1

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Abstract

Motivated by the recently discovered bilayer nickelate superconductor, the pressurized La3Ni2O7, we present a renormalized mean-field theory of a bilayer single-orbital t−J model, highlighting the interplay between magnetism and superconductivity. We analyze the pairing symmetry and magnetic properties of the system, predicting two distinct states in which magnetism and superconductivity coexist. As hole doping increases, the magnetic order is rapidly suppressed. The interlayer hopping t⊥ and coupling J⊥ promote a transition from intralayer d-wave pairing to s-wave pairing, which is accompanied by a shift from antiferromagnetic order to a double spin stripe configuration. The latter has been extensively observed in ambient and high-pressure experiments. Our study offers theoretical insights into the coexistence of spin density waves and superconductivity.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
La3Ni2O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	80	Pressure not reported	unknown
La4Ni3O10 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	30	Pressure not reported	unknown