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Superconductivity from Doping Symmetric Mass Generation Insulators: Application to La$_3$Ni$_2$O$_7$ under Pressure
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abstract
We investigate the bilayer nickelates as a platform to realize the symmetric mass generation (SMG) insulator, a featureless Mott insulator that arises due to the Lieb-Schultz-Mattis (LSM) anomaly cancellation in bilayer spin-1/2 lattice systems. Through a single-orbital bilayer square lattice model involving intralayer hopping $t$ and interlayer superexchange interaction $J$, we demonstrate the emergence of high-temperature superconductivity (SC) upon doping the SMG insulator. The SC phase features $s$-wave interlayer spin-singlet pairing and exhibits a crossover between the BCS and BEC limits by tuning the $J/t$ ratio. We estimate the SC transition temperature $T_c$ from both the weak and strong coupling limits at the mean-field level. Our findings offer insights into the experimentally observed decrease in $T_c$ with pressure and the strange metal behavior above $T_c$. Additionally, we propose that both Ni $3d_{z^2}$ and $3d_{x^2-y^2}$ orbitals can exhibit superconductivity in La$_3$Ni$_2$O$_7$ under pressure, but their $T_c$ should vary in opposite ways under doping. This characteristic difference suggests a potential experimental pathway to identify which electronic orbital plays the principal role in the formation of superconductivity in this system.
Forward citations
Cited by 5 Pith papers
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Spin correlations in La$_3$Ni$_2$O$_7$ thin films
RIXS on strained La3Ni2O7 films shows the interlayer exchange Jz is enhanced under compressive strain (superconducting films) and suppressed under tensile strain, supporting spin-fluctuation-mediated interlayer pairing.
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Magnetic Order in bilayer Ruddlesden-Popper Nickelates
Combining superexchange with RKKY interactions between orbital-selective local moments reproduces the (π/2,π/2) magnetic order and ~80 meV spin excitations of bilayer nickelate La₃Ni₂O₇.
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Evolution from intralayer to interlayer superconductivity in a bilayer $t$-$J$ model
In a bilayer t-J-J⊥ ladder, increasing the interlayer spin coupling J⊥ drives a transition from intralayer to interlayer superconductivity, with a charge-density-wave intermediate phase at low doping and enhanced inte...
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Filling and Interlayer Superexchange Control Superconductivity in La$_3$Ni$_2$O$_7$
The superconducting T_c of La3Ni2O7 is controlled by the d_x2-y2 orbital filling and the interlayer magnetic exchange J_perp, so clean electron doping should raise T_c.
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Orbital-selective correlation effects and superconducting pairing symmetry in a multiorbital $t$-$J$ model for bilayer nickelates
In a bilayer two-orbital t-J model for La3Ni2O7, the leading pairing is either extended s-wave or d_{x^2-y^2}-wave, and moving the z2 bonding band through the Fermi level switches the dominant pairing orbital from z2 ...
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