Journal
PHYSICAL REVIEW B
Volume 89, Issue 21, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.89.214511
Keywords
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Funding
- National Basic Research Program of China [2014CB921203, 2011CBA00103]
- NSF of China [11274268]
- NSERC
- CIFAR
- Department of Energy, Basic Energy Sciences, Materials Sciences and Engineering Division
- NSFC
- Ministry of Science and Technology of China
- Chinese Academy of Sciences
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We investigate the nature of the SDW (spin density wave) transition in the underdoped regime of an iron-based high-T-c superconductor Ba(Fe1-xCox)(2)As-2 by As-75 NMR, with primary focus on a composition with x = 0.02 (T-SDW = 99 K). We demonstrate that critical slowing down toward the three-dimensional SDW transition sets in at the tetragonal to orthorhombic structural phase transition T-s = 105 K, suggesting strong interplay between structural distortion and spin correlations. In the critical regime between T-s and T-SDW, the dynamical structure factor of electron spins S(q,omega(n)) measured with the longitudinal NMR relaxation rate 1/T-1 exhibits a divergent behavior obeying a power law 1/T-1 proportional to Sigma S-q(q,omega(n)) similar to (T/T-SDW - 1)(-delta) with the critical exponent delta similar to 0.33.
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