Journal
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
Volume 77, Issue 10, Pages -Publisher
PHYSICAL SOC JAPAN
DOI: 10.1143/JPSJ.77.103705
Keywords
iron pnictide superconductor; high temperature superconductivity; NMR
Categories
Funding
- NSERC
- CFI
- CIFAR
- U.S. Department of Energy [DE-AC-05-00OR22725]
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We report an NMR investigation of the superconductivity in BaFe(2)AS(2) induced by Co doping (T-c = 22 K). We demonstrate that Co atoms form an alloy with Fe atoms and donate carriers without creating localized moments. Our finding strongly suggests that the underlying physics of iron-pnictide superconductors is quite different from the widely accepted physical picture of high T-c cuprates as doped Mott insulators. We also show a crossover of electronic properties into a low temperature pseudo-gap phase with a pseudo-gap Delta(PG)/k(B) similar to 560 K, where chi(spin) similar to constant and resisitivty rho proportional to T. The NMR Knight shift below T-c decreases for both along the c-axis and ab-plane, and is consistent with the singlet pairing scenario.
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