Abstract
We present extensive magnetic measurements of the system with its four different families having a variation of 28% and minimal structural changes. For each family, we measured the Néel temperature, the anisotropies of the magnetic interactions, and the spin-glass temperature. Our results exhibit a universal relation for all families, where , is the in-plane Heisenberg exchange, and is the superconducting carrier density. This relates cuprate superconductivity to magnetism in the same sense that phonon-mediated superconductivity is related to atomic mass.
- Received 30 October 2006
DOI:https://doi.org/10.1103/PhysRevB.74.220508
©2006 American Physical Society