2009/02/28 by Fanlong Ning, F. L. Ning, K. Ahilan +11
Chemistry · Materials Science · Physics and Astronomy · #Chemistry #Condensed matter physics #Crystallography #Doping #Iron-based superconductors research #Nuclear magnetic resonance #Phase (matter) #Physics #Physics of Superconductivity and Magnetism #Quantum mechanics #Rare-earth and actinide compounds #Spin (aerodynamics) #Thermodynamics #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.79.140506
published as Physical Review B, 79, 140506(R), (2009) · 4 figures are changed to color online. 4 pages
arxiv created 2009/04/23 · openalex publication_date 2009/04/23 · arxiv updated 2015/05/12 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We investigate the electronic properties of Ba(Fe_1\ensuremath-xCox)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, TSDW. Furthermore, ordered moments below TSDW exhibit large distribution. Strong spin fluctuations remain even below TSDW, 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.