NMR evidence for static local nematicity and its cooperative interplay with low-energy magnetic fluctuations in FeSe under pressure

Abstract

We present ${}^{77}$Se-NMR measurements on single-crystalline FeSe under pressures up to 2 GPa. Based on the observation of the splitting and broadening of the NMR spectrum due to structural twin domains, we discovered that static, local nematic ordering exists well above the bulk nematic ordering temperature, $T_{\mathrm{s}}$. The static, local nematic order and the low-energy stripe-type antiferromagnetic spin fluctuations, as revealed by NMR spin-lattice relaxation rate measurements, are both insensitive to pressure application. These NMR results provide clear evidence for the microscopic cooperation between magnetism and local nematicity in FeSe.

5 pages, 5 figures, accepted for publication in Phys. Rev. B rapid communication

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• ${}^{77}$Se-NMR Study under Pressure on 12%-S Doped FeSe
• Pressure-induced reconstitution of Fermi surfaces and spin fluctuations in S-substituted FeSe
• Spin fluctuations from Bogoliubov Fermi surfaces in the superconducting state of S-substituted FeSe
• Interrelationships between nematicity, antiferromagnetic spin fluctuations and superconductivity: Role of hotspots in FeSe${}_{1-x}$S${}_x$ revealed by high pressure ${}^{77}$Se NMR study
• Defect-induced electronic smectic state at the surface of nematic materials
• Strong correlation between $H$-linear magnetoresistance and strange metal in FeSe superconductor
• Edwards-Anderson parameter and local Ising-nematicity in FeSe revealed via NMR spectral broadening
• Decoupled nematic and magnetic criticality in FeSe${}_{1-x}$S${}_x$