Evidence for rare-region physics in the structural and electronic degrees of freedom of the nickelate La$_{2-x}$Sr$_x$NiO$_4$
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| Main Authors: | , , , , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866909977843597312 |
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| author | Spieker, R. J. Krohnke, B. Zhai, D. Benet, A. Lopez Spaić, M. He, X. Tan, C. Y. Anderson, Z. W. Ye, F. Cao, H. Krogstad, M. J. Osborn, R. Pelc, D. Greven, M. |
| author_facet | Spieker, R. J. Krohnke, B. Zhai, D. Benet, A. Lopez Spaić, M. He, X. Tan, C. Y. Anderson, Z. W. Ye, F. Cao, H. Krogstad, M. J. Osborn, R. Pelc, D. Greven, M. |
| contents | We present a diffuse neutron and x-ray scattering study of structural, spin- and charge-density-wave fluctuations in the electrical insulator La$_{2-x}$Sr$_x$NiO$_4$. This lamellar nickelate is an isostructural analogue of the high-temperature cuprate superconductor La$_{2-x}$Sr$_x$CuO$_4$, for which recent experiments uncovered evidence for unusual structural and superconducting fluctuations indicative of rare-region physics due to inherent inhomogeneity unrelated to common point disorder effects. We find closely analogous nanoscale orthorhombic fluctuation behavior in La$_{2-x}$Sr$_x$NiO$_4$, including exponential scaling of the diffuse scattering intensity and power-law scaling of the characteristic length with relative temperature. Moreover, our neutron and x-ray scattering data reveal similar behavior for short-range magnetic and charge fluctuations above the respective ordering temperatures. These observations indicate that rare-region effects are a generic feature of perovskite-related structures and lead to universal fluctuations of both structural and electronic degrees of freedom over extended temperature ranges. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2512_23655 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Evidence for rare-region physics in the structural and electronic degrees of freedom of the nickelate La$_{2-x}$Sr$_x$NiO$_4$ Spieker, R. J. Krohnke, B. Zhai, D. Benet, A. Lopez Spaić, M. He, X. Tan, C. Y. Anderson, Z. W. Ye, F. Cao, H. Krogstad, M. J. Osborn, R. Pelc, D. Greven, M. Strongly Correlated Electrons We present a diffuse neutron and x-ray scattering study of structural, spin- and charge-density-wave fluctuations in the electrical insulator La$_{2-x}$Sr$_x$NiO$_4$. This lamellar nickelate is an isostructural analogue of the high-temperature cuprate superconductor La$_{2-x}$Sr$_x$CuO$_4$, for which recent experiments uncovered evidence for unusual structural and superconducting fluctuations indicative of rare-region physics due to inherent inhomogeneity unrelated to common point disorder effects. We find closely analogous nanoscale orthorhombic fluctuation behavior in La$_{2-x}$Sr$_x$NiO$_4$, including exponential scaling of the diffuse scattering intensity and power-law scaling of the characteristic length with relative temperature. Moreover, our neutron and x-ray scattering data reveal similar behavior for short-range magnetic and charge fluctuations above the respective ordering temperatures. These observations indicate that rare-region effects are a generic feature of perovskite-related structures and lead to universal fluctuations of both structural and electronic degrees of freedom over extended temperature ranges. |
| title | Evidence for rare-region physics in the structural and electronic degrees of freedom of the nickelate La$_{2-x}$Sr$_x$NiO$_4$ |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2512.23655 |