Critical spin fluctuations across the superconducting dome in La$_{2-x}$Sr$_{x}$CuO$_4$
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arXiv
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| Main Authors: | , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866917527319216128 |
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| author | Radaelli, Jacopo Lipscombe, Oliver J. Zhu, Mengze Stewart, J. Ross Patel, Aavishkar A. Sachdev, Subir Hayden, Stephen M. |
| author_facet | Radaelli, Jacopo Lipscombe, Oliver J. Zhu, Mengze Stewart, J. Ross Patel, Aavishkar A. Sachdev, Subir Hayden, Stephen M. |
| contents | Overdoped cuprate superconductors are strange metals above their superconducting transition temperature. In such materials, the electrical resistivity has a strong linear dependence on temperature ($T$) and electrical current is not carried by electron quasiparticles as in conventional metals. Here we demonstrate that the strange metal behaviour co-exists with strongly temperature-dependent critical spin fluctuations showing dynamical scaling across the cuprate phase diagram. Our neutron scattering observations and the strange metal behaviour are consistent with a spin density wave quantum phase transition in a metal with spatial disorder in the tuning parameter. Numerical computations using a theory of spin density waves in a disordered metal yield an extended `Griffiths phase' with scaling properties in agreement with experimental observations. Thus we establish that low-energy spin excitations and spatial disorder are central to the strange metal behaviour. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_13600 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Critical spin fluctuations across the superconducting dome in La$_{2-x}$Sr$_{x}$CuO$_4$ Radaelli, Jacopo Lipscombe, Oliver J. Zhu, Mengze Stewart, J. Ross Patel, Aavishkar A. Sachdev, Subir Hayden, Stephen M. Superconductivity Overdoped cuprate superconductors are strange metals above their superconducting transition temperature. In such materials, the electrical resistivity has a strong linear dependence on temperature ($T$) and electrical current is not carried by electron quasiparticles as in conventional metals. Here we demonstrate that the strange metal behaviour co-exists with strongly temperature-dependent critical spin fluctuations showing dynamical scaling across the cuprate phase diagram. Our neutron scattering observations and the strange metal behaviour are consistent with a spin density wave quantum phase transition in a metal with spatial disorder in the tuning parameter. Numerical computations using a theory of spin density waves in a disordered metal yield an extended `Griffiths phase' with scaling properties in agreement with experimental observations. Thus we establish that low-energy spin excitations and spatial disorder are central to the strange metal behaviour. |
| title | Critical spin fluctuations across the superconducting dome in La$_{2-x}$Sr$_{x}$CuO$_4$ |
| topic | Superconductivity |
| url | https://arxiv.org/abs/2503.13600 |