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Article Dans Une Revue Physical Review Letters Année : 2018

Collapse of Critical Nematic Fluctuations in FeSe under Pressure

Pierre Massat
  • Fonction : Auteur
Yundi Quan
  • Fonction : Auteur
Romain Grasset
  • Fonction : Auteur
Marie-Aude Méasson
Maximilien Cazayous
Alain Sacuto
  • Fonction : Auteur
Sandra Karlsson
  • Fonction : Auteur
Pierre Strobel
  • Fonction : Auteur
Pierre Toulemonde
  • Fonction : Auteur
Zhiping Yin
  • Fonction : Auteur

Résumé

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 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 nematicity in the phase diagram of FeSe under pressure: a d-wave Pomeranchuk instability of the Fermi surface at low pressure and a magnetic driven orthorhombic distortion at higher pressure.

Dates et versions

hal-03774715 , version 1 (12-09-2022)

Identifiants

Citer

Pierre Massat, Yundi Quan, Romain Grasset, Marie-Aude Méasson, Maximilien Cazayous, et al.. Collapse of Critical Nematic Fluctuations in FeSe under Pressure. Physical Review Letters, 2018, 121 (7), pp.077001. ⟨10.1103/PhysRevLett.121.077001⟩. ⟨hal-03774715⟩
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