59Co and 75As NMR investigation of lightly doped Ba(Fe1-xCox)2As2(x=0.02,0.04)

Journal Article · Thu Jan 01 04:00:00 EST 2009 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.79.140506· OSTI ID:964354

Ning, F. L. ^[1]; Ahilan, K. ^[1]; Imai, T. ^[1]; Sefat, A. S. ^[2]; Jin, Rongying ^[3]; McGuire, Michael A ^[3]; Sales, Brian C ^[3]; Mandrus, David ^[3]

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1. McMaster University
2. Oak Ridge National Laboratory (ORNL)
3. ORNL

We investigate the electronic properties of Ba(Fe{sub 1-x}Co{sub x}){sub 2}As{sub 2} (x = 0.02,0.04) in the lightly electron-doped regime by {sup 59}Co and {sup 75}As NMR. We demonstrate that Co doping significantly suppresses the magnetic ordering temperature to the SDW state, T{sub SDW}. Furthermore, ordered moments below T{sub SDW} exhibit large distribution. Strong spin fluctuations remain even below T{sub 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.

• Research Organization: Oak Ridge National Laboratory (ORNL)
• Sponsoring Organization: SC USDOE - Office of Science (SC)
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 964354
• Journal Information: Physical Review B, Journal Name: Physical Review B Journal Issue: 14 Vol. 79; ISSN 1098-0121
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ARSENIC ALLOYS
BARIUM ALLOYS
COBALT ALLOYS
ELECTRICAL PROPERTIES
IRON ALLOYS
MAGNETIC PROPERTIES
NUCLEAR MAGNETIC RESONANCE