Quantum criticality at the end of a pseudogap phase in superconducting infinite-layer nickelates
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arXiv
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| Autori principali: | , , , , , , , |
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| Natura: | Preprint |
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2025
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| author | Iorio-Duval, C. Beauchesne-Blanchet, E. Perreault, F. González, J. L. Santana Sun, W. Nie, Y. F. Gourgout, A. Grissonnanche, G. |
| author_facet | Iorio-Duval, C. Beauchesne-Blanchet, E. Perreault, F. González, J. L. Santana Sun, W. Nie, Y. F. Gourgout, A. Grissonnanche, G. |
| contents | In many unconventional superconductors, the strange-metal regime is thought to emerge from quantum criticality, yet in cuprates this link is obscured by the enigmatic pseudogap. Superconducting infinite-layer nickelates provide a new arena to test this paradigm but are constrained to thin films, precluding calorimetry. We use the Seebeck coefficient as a low-temperature proxy for entropy per carrier and uncover a clear quantum-critical thermodynamic signature: in La$_{1-x}$Sr$_x$NiO$_2$ at the onset of $T$-linear resistivity ($x=0.20$), $S/T$ diverges logarithmically upon cooling, $S/T \propto \log T$. Boltzmann transport based on ARPES-derived band structure reproduces the high-temperature magnitude and sign of $S/T$ and reveals a threefold mass renormalization at the Fermi level. To identify the terminating phase, we analyze Hall data across Nd$_{1-x}$Sr$_x$NiO$_2$ and show that its temperature evolution is quantitatively captured by a minimal two-band model in which a strongly correlated Ni-$d_{x^2-y^2}$ Fermi surface exhibits Planckian $T$-linear scattering while the rare-earth Nd-$s$ pocket remains Fermi-liquid-like. Inverting the zero-temperature Hall response reveals a collapse of the Ni-$d_{x^2-y^2}$ band carrier density from $1+p$ to $p$ holes across the critical doping, without long-range magnetic order -- mirroring the cuprate pseudogap transition in cuprates. These results establish a quantum critical point at the end of a pseudogap-like phase in infinite-layer nickelates and unify the broader paradigm among correlated superconductors that strange metal behaviour is intimately linked to quantum criticality. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_12786 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Quantum criticality at the end of a pseudogap phase in superconducting infinite-layer nickelates Iorio-Duval, C. Beauchesne-Blanchet, E. Perreault, F. González, J. L. Santana Sun, W. Nie, Y. F. Gourgout, A. Grissonnanche, G. Strongly Correlated Electrons Superconductivity In many unconventional superconductors, the strange-metal regime is thought to emerge from quantum criticality, yet in cuprates this link is obscured by the enigmatic pseudogap. Superconducting infinite-layer nickelates provide a new arena to test this paradigm but are constrained to thin films, precluding calorimetry. We use the Seebeck coefficient as a low-temperature proxy for entropy per carrier and uncover a clear quantum-critical thermodynamic signature: in La$_{1-x}$Sr$_x$NiO$_2$ at the onset of $T$-linear resistivity ($x=0.20$), $S/T$ diverges logarithmically upon cooling, $S/T \propto \log T$. Boltzmann transport based on ARPES-derived band structure reproduces the high-temperature magnitude and sign of $S/T$ and reveals a threefold mass renormalization at the Fermi level. To identify the terminating phase, we analyze Hall data across Nd$_{1-x}$Sr$_x$NiO$_2$ and show that its temperature evolution is quantitatively captured by a minimal two-band model in which a strongly correlated Ni-$d_{x^2-y^2}$ Fermi surface exhibits Planckian $T$-linear scattering while the rare-earth Nd-$s$ pocket remains Fermi-liquid-like. Inverting the zero-temperature Hall response reveals a collapse of the Ni-$d_{x^2-y^2}$ band carrier density from $1+p$ to $p$ holes across the critical doping, without long-range magnetic order -- mirroring the cuprate pseudogap transition in cuprates. These results establish a quantum critical point at the end of a pseudogap-like phase in infinite-layer nickelates and unify the broader paradigm among correlated superconductors that strange metal behaviour is intimately linked to quantum criticality. |
| title | Quantum criticality at the end of a pseudogap phase in superconducting infinite-layer nickelates |
| topic | Strongly Correlated Electrons Superconductivity |
| url | https://arxiv.org/abs/2510.12786 |