"Optical Excitation of Coherent THz Dynamics of the Rare-Earth Lattice through Resonant Pumping of <mml:math xmlns:mml=""http://www.w3.org/1998/Math/MathML"" display=""inline""><mml:mrow><mml:mi>f</mml:mi><mml:mtext>−</mml:mtext><mml:mi>f</mml:mi></mml:mrow></mml:math> Electronic Transition in a Complex Perovskite <mml:math xmlns:mml=""http://www.w3.org/1998/Math/MathML"" display=""inline""><mml:mrow>"