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Direct observation of the superconducting energy gap in the optical conductivity of the iron pnictide superconductor Ba(Fe0.9Co0.1)2As2. Phys. Rev. B, (81)6:060509, American Physical Society, February 2010. [PUMA: energy gap iron pnictide superconductor] URL
Extremely Small Energy Gap in the Quasi-One-Dimensional Conducting Chain Compound SrNbO3.41. Phys. Rev. Lett., (89)23:236403, American Physical Society, November 2002. [PUMA: energy gap SrNbO] URL