Journal
PHYSICAL REVIEW B
Volume 79, Issue 14, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.79.140506
Keywords
band structure; barium compounds; cobalt compounds; doping; high-temperature superconductors; iron compounds; nuclear magnetic resonance; spin density waves; spin fluctuations
Funding
- NSERC
- CIFAR
- CFI
- Division of Materials Science and Engineering, Office of Basic Sciences, Oak Ridge National Laboratory is managed by UT-Battelle, LLC, for the U. S. Department of Energy [DE-AC-05-00OR22725]
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We investigate the electronic properties of Ba(Fe1-xCox)(2)As-2 (x=0.02,0.04) in the lightly electron-doped regime by Co-59 and As-75 NMR. We demonstrate that Co doping significantly suppresses the magnetic ordering temperature to the SDW state, T-SDW. Furthermore, ordered moments below T-SDW exhibit large distribution. Strong spin fluctuations remain even below T-SDW, persisting all the way down to 4.2 K. We find no signature of additional freezing of spin degrees of freedom unlike the case of the lightly hole-doped stripe phase of the cuprates.
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