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Soft phonons reveal the nematic correlation length in Ba(Fe_(0.94)Co_(0.06))₂As₂

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arxiv 1806.05581 v1 pith:6YQMWVQK submitted 2018-06-14 cond-mat.supr-con

Soft phonons reveal the nematic correlation length in Ba(Fe_(0.94)Co_(0.06))₂As₂

F. Weber , D. Parshall , L. Pintschovius , J.-P. Castellan , M. Kauth , M. Merz , Th. Wolf , M. Sch\"utt
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J. Schmalian R. M. Fernandes D. Reznik
This is my paper
classification cond-mat.supr-con
keywords nematicfluctuationscorrelationlengthnematicityacousticanomalousaveraged
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Nematicity is ubiquitous in electronic phases of high-$T_c$ superconductors, particularly in the Fe-based systems. While several experiments have probed nematic fluctuations, they have been restricted to uniform or momentum averaged fluctuations. Here, we investigate the behavior of finite-momentum nematic fluctuations by utilizing the anomalous softening of acoustic phonon modes in optimally doped Ba(Fe$_{0.94}$Co$_{0.06}$)$_2$As$_2$. We determine the nematic correlation length and find that it sharply changes its $T$-dependence at $T_c$, revealing a strong connection between nematicity and superconductivity.

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