TY - GEN AU - Yu,Li AU - Munzar,D AU - Boris,A V AU - Yordanov,P AU - Chaloupka,J AU - Wolf,Th AU - Lin,C T AU - Keimer,B AU - Bernhard,C TI - Evidence for two separate energy gaps in underdoped high-temperature cuprate superconductors from broadband infrared ellipsometry SN - 0031-9007 PY - 2008///0624 N1 - Publication Type: Journal Article; Research Support, Non-U.S. Gov't UR - https://doi.org/10.1103/PhysRevLett.100.177004 ER -