59Co and 75As NMR Investigation of the Lightly Doped Ba[Fe(1-x)Co(x)]2As2 (x =0.02, 0.04)
| Autor: | Ning, F. L., Ahilan, K., Imai, T., Sefat, A. S., Jin, R., McGuire, M. A., Sales, B. C., Mandrus, D. |
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| Rok vydání: | 2009 |
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| Zdroj: | Physical Review B, 79, 140506(R), (2009) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevB.79.140506 |
| Popis: | 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. Comment: 4 figures are changed to color online. 4 pages |
| Databáze: | arXiv |
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