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High-energy spin excitations in the optimally doped Ba0.67K0.33Fe2As2
From our previous data on BaFe2As2 and BaFe1.9Ni0.1As2, one may assume that the superconductivity only affects the low energy excitations. But for Ba0.67K0.33Fe2As2, the doping... -
Low energy spin wave of BiFeO3 single crystal
Of all multiferroic materials, BiFeO3 stands out particularly with its both magnetic and ferroelectric transition temperatures above room temperatures, more interestingly having...