Non-Fermi-Liquid Transport Phenomena in Infinite-Layer Nickelates
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arXiv
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| Autores principales: | , |
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| Formato: | Preprint |
| Publicado: |
2024
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| _version_ | 1866909949733371904 |
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| author | Hiragami, Shinichi Onari, Seiichiro |
| author_facet | Hiragami, Shinichi Onari, Seiichiro |
| contents | Recently discovered superconducting infinite-layer nickelates $R$NiO$_2$ ($R$=Nd, La, Pr) attract increasing attention due to their similarities to cuprates. Both $R$NiO$_2$ and YBCO cuprates exhibit the non-Fermi-liquid transport behavior, characterized by resistivity proportional to temperature near the quantum critical point of the charge or spin density wave. In this study, we analyze the resistivity of infinite-layer nickelate Nd$_{0.85}$Sr$_{0.15}$NiO$_2$ based on a three-dimensional tight-binding model within the framework of the quasi-particle picture by applying linear response theory. We take account of the self-energy by the fluctuation-exchange approximation for the Ni orbital and the T-matrix approximation for an impurity effect on the Nd orbitals. We find that (i) the $T$-linear resistivity at low temperatures is derived from the spin fluctuations, and (ii) a negative and $T$-linear Seebeck coefficient is obtained. Therefore, NdNiO$_2$ behaves as a quasi-two-dimensional electron system, similar to CeCoIn$_5$. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2410_01412 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Non-Fermi-Liquid Transport Phenomena in Infinite-Layer Nickelates Hiragami, Shinichi Onari, Seiichiro Strongly Correlated Electrons Superconductivity Recently discovered superconducting infinite-layer nickelates $R$NiO$_2$ ($R$=Nd, La, Pr) attract increasing attention due to their similarities to cuprates. Both $R$NiO$_2$ and YBCO cuprates exhibit the non-Fermi-liquid transport behavior, characterized by resistivity proportional to temperature near the quantum critical point of the charge or spin density wave. In this study, we analyze the resistivity of infinite-layer nickelate Nd$_{0.85}$Sr$_{0.15}$NiO$_2$ based on a three-dimensional tight-binding model within the framework of the quasi-particle picture by applying linear response theory. We take account of the self-energy by the fluctuation-exchange approximation for the Ni orbital and the T-matrix approximation for an impurity effect on the Nd orbitals. We find that (i) the $T$-linear resistivity at low temperatures is derived from the spin fluctuations, and (ii) a negative and $T$-linear Seebeck coefficient is obtained. Therefore, NdNiO$_2$ behaves as a quasi-two-dimensional electron system, similar to CeCoIn$_5$. |
| title | Non-Fermi-Liquid Transport Phenomena in Infinite-Layer Nickelates |
| topic | Strongly Correlated Electrons Superconductivity |
| url | https://arxiv.org/abs/2410.01412 |