3 years ago

Collapse of nematic fluctuations in FeSe under pressure.

Romain Grasset, Sandra Karlsson, Alain Sacuto, Zhiping Yin, Pierre Toulemonde, Yann Gallais, Yundi Quan, Maximilien Cazayous, Pierre Strobel, Marie-Aude Méasson, Pierre Massat

We report the evolution of the electronic nematic susceptibility in FeSe via Raman scattering as a function of hydrostatic pressure up to $5.8\,$GPa where the superconducting transition temperature $T_{c}$ reaches its maximum. The critical nematic fluctuations observed at low pressure quickly vanish above $1.6\,$GPa, indicating they play a marginal role in the four-fold enhancement of $T_{c}$ at higher pressures. The collapse of nematic fluctuations appears to be linked to a suppression of low energy electronic excitations which manifests itself by optical phonon anomalies at around $2\,$GPa, in agreement with lattice dynamical and electronic structure calculations using local density approximation combined with dynamical mean field theory. Our results reveal two different regimes of nematic fluctuations in the phase diagram of FeSe under pressure, and shed new light on the interplay between nematicity, magnetism and superconductivity in iron based superconductors.

Publisher URL: http://arxiv.org/abs/1801.10316

DOI: arXiv:1801.10316v1

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