RIXS shows that high-energy paramagnons in LCCO cuprate films persist to x=0.50 and are insensitive to the extended superconducting dome, indicating they are not the primary pairing glue.
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Evolution of spin excitations in superconducting La$_{2-x}$Ca$_{x}$CuO$_{4-\delta}$ from the underdoped to the heavily overdoped regime
RIXS shows that high-energy paramagnons in LCCO cuprate films persist to x=0.50 and are insensitive to the extended superconducting dome, indicating they are not the primary pairing glue.