Dr. David C. Johnston
Ames Lab - Iowa State University
The Puzzle of High-Temperature Superconductivity in Iron
Pnictides
Iron is a ferromagnetic metal, and ferromagnetism and
superconductivity are generally mutually exclusive. Therefore the
discovery of superconductivity in Fe-pnictide (pnictide = As, P) compounds in
2008 with high transition temperatures Tc up to 56 K was a welcome shock to the
CMP community. Experimental and theoretical studies carried out over the
past five years that help to explain this puzzle will be discussed. The
results strongly point to an unconventional magnetic mechanism for high-Tc
superconductivity in the Fe-pnictides, just as is generally believed to be the
case in the layered copper oxides discovered in 1986 that have Tc’s up to 164
K, despite the large differences between these two types of materials.
Our recent studies of compounds that we synthesized in an attempt to discover
new, but related, high-Tc superconductors will also be discussed.
Contact: Pat Korosec 407-823-325
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