Dielectric response of BaTiO<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si1.svg"><mml:msub><mml:mrow /><mml:mn>3</mml:mn></mml:msub></mml:math> electronic states under AC fields via microsecond time-resolved X-ray absorption spectroscopy
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