Momentum Depndence of the Superconducting Gap in NdFeAsO0.9F0.1 Single Crystals Measured by Angle Resolved Photoemission Spectroscopy

Journal Article · Thu Oct 02 00:00:00 EDT 2008 · Physical Review Letters

OSTI ID:941073

Kondo, Takeshi; Santander-Syro, A F; Copie, O; Liu, Chang; Tillman, M E; Mun, E D; Schmalian, J; Bud'ko, S L; Tanatar, M A; Canfield, P C; Kaminski, A

We use angle resolved photoemission spectroscopy to study the momentum dependence of the superconducting gap in NdFeAsO{sub 0.9}F{sub 0.1} single crystals. We find that the hole pocket is fully gapped below the superconducting transition temperature. The value of the superconducting gap is 15 {+-} 1.5 meV and its anisotropy around the hole pocket is smaller than 20% of this value--consistent with an isotropic or anisotropic s-wave symmetry of the order parameter. This is a significant departure from the situation in the cuprates, pointing to the possibility that the superconductivity in the iron arsenic based system arises from a different mechanism.

• Research Organization: Ames Lab., Ames, IA (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: DE-AC02-07CH11358
• OSTI ID: 941073
• Report Number(s): IS-J 7325; PRLTAO; TRN: US0807283
• Journal Information: Physical Review Letters, Vol. 101, Issue 14; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ANISOTROPY
ARSENIC
CUPRATES
IRON
MONOCRYSTALS
ORDER PARAMETERS
PHOTOEMISSION
SPECTROSCOPY
SUPERCONDUCTIVITY
SYMMETRY
TRANSITION TEMPERATURE