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- W2976100168 abstract "The recent observation of superconductivity at relatively high temperatures in hole doped NdNiO$_2$ has generated considerable interest, particularly due to its similarity with the infinite layer cuprates. Building on the observation that the Ni$^{2+}$ ions resulting from hole doping are commonly found in the spin-triplet state, we introduce and study a variant of the $t-J$ model in which the holes carry S=1. We name this new model the Type II $t-J$ model. We find two distinct mechanisms for $d$ wave superconductivity. In both scenarios the pairing is driven by the spin coupling $J$. However, coherence is gained in distinct ways in these two scenarios. In the first case, the spin-one holes condense leading to a $d$ wave superconductor along with spin-symmetry breaking. Different orders including spin-nematic orders are possible. This scenario is captured by a spin one slave boson theory. In the second scenario, a coherent and symmetric $d$ wave superconductor is achieved from Kondo resonance: spin one holes contribute two electrons to form large Fermi surface together with the spin 1/2 singly occupied sites. The large Fermi surface then undergoes $d$ wave pairing because of spin coupling $J$, similar to fermion superconductor. We propose a three-fermion parton theory to treat these two different scenarios in one unified framework and calculate its doping phase diagram within a self consistent mean field approximation. Our study shows that a combination of cuprate physics and heavy fermion physics may emerge in the type II $t-J$ model." @default.
- W2976100168 created "2019-10-03" @default.
- W2976100168 creator A5043780039 @default.
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- W2976100168 date "2019-09-27" @default.
- W2976100168 modified "2023-09-27" @default.
- W2976100168 title "Kondo resonance and $d$-wave superconductivity in the $t-J$ model with spin one holes: possible applications to the nickelate superconductor Nd$_{1-x}$Sr$_x$NiO$_2$" @default.
- W2976100168 hasPublicationYear "2019" @default.
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