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In the cuprate and iron-pnictide systems, valence changes inducehigh-temperature superconductivity while the local structural chemistry andlocal spin order both independently generate the attractive interactionsresponsible for the high transition temperature. We argue that together theyfavor d-wave singlet superconductivity in the cuprates but s-wave singlet inthe pnictides. This difference arises from the existence of a large on-siterepulsion between carriers in the cuprates largely absent in the pnictides.Fluorine is responsible for raising Tc significantly in some pnictides and inthe cuprates to 155K-168K, the highest achieved at ambient pressure. We proposean experimental procedure for finding and fabricating the fluorinated cupratephase having that exceptional property.

Structural Chemistry, Spin Order, and the Distinction Between the Cuprate and Pnictide High-Temperature Superconductors