C59oandA75sNMR investigation of lightly dopedBa(Fe1−xCox)2As2(x=0.02,0.04) Academic Article uri icon

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abstract

  • We investigate the electronic properties of Ba[Fe(1-x)Co(x)]2As2 (x =0.02, 0.04) in the lightly electron-doped regime by 59Co and 75As 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.

authors

  • Ning, FL
  • Ahilan, K
  • Imai, Takashi
  • Sefat, AS
  • Jin, R
  • McGuire, MA
  • Sales, BC
  • Mandrus, D

publication date

  • April 1, 2009