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Measurement of Two Low-Temperature Energy Gaps in the Electronic Structure of Antiferromagnetic<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>USb</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:math>Using Ultrafast Optical Spectroscopy
Ultrafast optical spectroscopy is used to study the antiferromagnetic $f$-electron system ${\mathrm{USb}}_{2}$. We observe the opening of two charge gaps at low temperatures ($\ensuremath{\lesssim}45\text{ }\text{ }\mathrm{K}$), arising from renormalization of the electronic structure. Analysis of our data indicates that one gap is due to hybridization between localized $f$-electron and conduction …