Journal
NATURE PHYSICS
Volume 12, Issue 6, Pages 560-+Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/NPHYS3634
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Funding
- German Research Foundation DFG through Priority Program [SPP 1458, HA2071/7, SCHM1035/5]
- Bavarian Californian Technology Center BaCaTeC [A5 [2012-2]]
- Transregional Collaborative Research Center [TRR 80]
- Helmholtz Association [PD-075]
- US Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering [DE-AC02-76SF00515]
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Nematic fluctuations and order play a prominent role in material classes such as the cuprates(1), some ruthenates(2) or the iron-based compounds(3-6) and may be interrelated with superconductivity(7-11). In iron-based compounds(12) signatures of nematicity have been observed in a variety of experiments. However, the fundamental question as to the relevance of the related spin(13), charge(9,14) or orbital(8,15,16) fluctuations remains open. Here, we use inelastic light (Raman) scattering and study Ba(Fe1-xCox)(2)As-2 (0 <= x <= 0.085) for getting direct access to nematicity and the underlying critical fluctuations with finite characteristic wavelengths(17-21). We show that the response from fluctuations appears only in B-1g (x(2) - y(2)) symmetry (1 Fe unit cell). The scattering amplitude increases towards the structural transition at T-s but vanishes only below the magnetic ordering transition at T-SDW < T-s, suggesting a magnetic origin of the fluctuations. The theoretical analysis explains the selection rules and the temperature dependence of the fluctuation response. These results make magnetism the favourite candidate for driving the series of transitions.
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