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Possibility of Skyrmion Superconductivity in Doped Antiferromagnet K$ 2$Fe$ 4$Se$ 5$ by Baskaran, G. is a scholarly article available to read on EtoBox.

What is Possibility of Skyrmion Superconductivity in Doped Antiferromagnet K$ 2$Fe$ 4$Se$ 5$ about?

Intercalated Fe chalcogenide K$_2$Fe$_4$Se$_5$ family exhibits high Tc ($\sim$ 30 K) superconductivity and spin-8 high T$_{\rm N}$ ($\sim$ 560 K) antiferromagnetism (AFM). We present a model Hamiltonian and suggest \textit{Skyrmion superconductivity}. A doped electron creates an orbitally non degenerate S=7\half state in a F$_4$Se$_9$ cluster and moves in a single correlated band, exchange coupled to a robust S=8 AFM order. Skyrmion, a topological excitation of 2 dimensional AFM order acquires an \textit{induced charge -2e} through a quantum anomaly and becomes a Cooper pair. Superconductivity emerges for a range of doping. Fluctuating superconductivity, arising from preformed Cooper pairs (stable Skyrmions), around room temperatures is predicted. We offer hope for higher Tc's in large-S Mott insulators.

Author

Baskaran, G.

Published

2011

Language

EN