Journal
NEW JOURNAL OF PHYSICS
Volume 13, Issue -, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1367-2630/13/2/023036
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Funding
- Korean government (MEST) [2010-0016560]
- US Department of Energy/Office of Science
- Los Alamos LDRD program
- Sungkyunkwan University
- US DOE [DE-FG02-08ER46492]
- US NSF [DMR-0954342]
- Basic Science Research Program [2010-0007487]
- Nuclear R and D Programs [2006-2002165, 2009-0078025]
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We present low-temperature specific heat of the electron-doped Ba(Fe0.9Co0.1)(2)As-2, which does not show any indication of an upturn down to 400 mK, the lowest measuring temperature. The lack of a Schottky-like feature at low temperatures or in magnetic fields up to 9 T enables us to identify enhanced low-temperature quasiparticle excitations and to study anisotropy in the linear term of the specific heat. Our results cannot be explained by a single or multiple isotropic superconducting gap, but are consistent with multi-gap superconductivity with nodes on at least one Fermi surface sheet.
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