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Selective THz excitation of collective modes in underdoped YBCO

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Abstract

We use intense broadband THz pulses to excite underdoped YBCO exhibiting competing superconducting and charge density wave ground states. We observe pronounced coherent oscillations at 1.85 and 2.65THz, attributed to renormalized low-energy phonon modes.

© 2014 Optical Society of America

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