Qualitative theory of magnetism and superconductivity of iron superconductors

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Date/Time:Thursday, 05 Apr 2012 - Thursday, 05 Apr 2012
Location:PHYSICS Room 5
Phone:515-294-5630
Channel:Condensed Matter Physics
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V. P. Antropov
Ames Laboratory

I will argue that unusual properties of very popular iron
superconductors can be qualitatively explained if we introduce
non-linear and anharmonic spin fluctuations in their paramagnetic
states. These fluctuations explain the formation of the observed
magnetic ground states of parent compounds, their spin wave excitations
and provide a dominant contribution to the spin-electron coupling,
responsible for the superconductivity.