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Nematic fluctuations and the magneto-structural phase transition in {rm Ba(Fe_(1-x)Co_x)₂As₂}

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arxiv 1507.06116 v1 pith:2F6OHFVT submitted 2015-07-22 cond-mat.str-el

Nematic fluctuations and the magneto-structural phase transition in {rm Ba(Fe_(1-x)Co_x)₂As₂}

Florian Kretzschmar , Thomas B\"ohm , Una Karahasanovi\'c , Bernhard Muschler , Andreas Baum , Daniel Jost , Joerg Schmalian , Sergio Caprara
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Marco Grilli Carlo Di Castro James G. Analytis Jiun-Haw Chu Ian Randal Fisher Rudi Hackl
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classification cond-mat.str-el
keywords fluctuationstransitionbelowmagneticonlyphaseresponsescattering
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An inelastic light (Raman) scattering study of nematicity and critical fluctuations in ${\rm Ba(Fe_{1-x}Co_x)_2As_2}$ ($0\le x \le 0.051$) is presented. It is shown that the response from fluctuations appears only in $B_{1g}$ (${x^2-y^2}$) symmetry. The scattering amplitude increases towards the structural transition at $T_s$ but vanishes only below the magnetic ordering transition at $T_{\rm SDW} < T_s$, 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 favorite candidate for driving the series of transitions.%Below $T_{\rm SDW}$ the gap of the magnetically ordered phase opens up.

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