Evolution of spin excitations in superconducting La$_{2-x}$Ca$_{x}$CuO$_{4-δ}$ from the underdoped to the heavily overdoped regime
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arXiv
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| Autores principales: | , , , , , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2025
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| author | Hameed, S. Liu, Y. Knauft, M. Rabinovich, K. S. Kim, G. Christiani, G. Logvenov, G. Yakhou-Harris, F. Boris, A. V. Keimer, B. Minola, M. |
| author_facet | Hameed, S. Liu, Y. Knauft, M. Rabinovich, K. S. Kim, G. Christiani, G. Logvenov, G. Yakhou-Harris, F. Boris, A. V. Keimer, B. Minola, M. |
| contents | We investigate high-energy spin excitations in hole-doped La$_{2-x}$Ca$_{x}$CuO$_{4-δ}$ films across a broad Ca doping range $x = 0.05-0.50$ using resonant inelastic x-ray scattering (RIXS). Polarization analysis and incident-photon energy detuning measurements confirm the persistence of collective paramagnon excitations up to $x = 0.50$. Consistent with previous studies on other cuprate families, we observe a pronounced crossover near $x = 0.15$, where paramagnon spectral weight is transferred to incoherent spin-flip excitations associated with the particle-hole continuum. The overall behavior of paramagnons in LCCO resembles that in other hole-doped cuprates and appears insensitive to the persistence of superconductivity at high doping levels in LCCO - up to at least $x = 0.50$, as demonstrated in prior work. These findings support the view that high-energy magnetic excitations probed by RIXS are not a major contributor to superconducting pairing, in line with theories of spin-fluctuation mediated superconductivity. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_06680 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Evolution of spin excitations in superconducting La$_{2-x}$Ca$_{x}$CuO$_{4-δ}$ from the underdoped to the heavily overdoped regime Hameed, S. Liu, Y. Knauft, M. Rabinovich, K. S. Kim, G. Christiani, G. Logvenov, G. Yakhou-Harris, F. Boris, A. V. Keimer, B. Minola, M. Superconductivity Strongly Correlated Electrons We investigate high-energy spin excitations in hole-doped La$_{2-x}$Ca$_{x}$CuO$_{4-δ}$ films across a broad Ca doping range $x = 0.05-0.50$ using resonant inelastic x-ray scattering (RIXS). Polarization analysis and incident-photon energy detuning measurements confirm the persistence of collective paramagnon excitations up to $x = 0.50$. Consistent with previous studies on other cuprate families, we observe a pronounced crossover near $x = 0.15$, where paramagnon spectral weight is transferred to incoherent spin-flip excitations associated with the particle-hole continuum. The overall behavior of paramagnons in LCCO resembles that in other hole-doped cuprates and appears insensitive to the persistence of superconductivity at high doping levels in LCCO - up to at least $x = 0.50$, as demonstrated in prior work. These findings support the view that high-energy magnetic excitations probed by RIXS are not a major contributor to superconducting pairing, in line with theories of spin-fluctuation mediated superconductivity. |
| title | Evolution of spin excitations in superconducting La$_{2-x}$Ca$_{x}$CuO$_{4-δ}$ from the underdoped to the heavily overdoped regime |
| topic | Superconductivity Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2509.06680 |