Non-Fermi liquid transport in the vicinity of nematic quantum critical point of FeSe${}_{1-x}$S${}_x$ superconductor

Abstract

Non-Fermi liquids are strange metals whose physical properties deviate qualitatively from those of conventional metals due to strong quantum fluctuations. In this paper, we report transport measurements on the FeSe${}_{1-x}$S${}_x$ superconductor, which has a quantum critical point of a nematic order without accompanying antiferromagnetism. We find that in addition to a linear-in-temperature resistivity ${\rho }_{xx}\propto T$, which is close to the Planckian limit, the Hall angle varies as $\cot {\theta }_{\mathrm{H}}\propto T^2$ and the low-field magnetoresistance is well scaled as $\Delta {\rho }_{xx}/{\rho }_{xx}\propto {\tan }^2{\theta }_{\mathrm{H}}$ in the vicinity of the nematic quantum critical point. This set of anomalous charge transport properties shows striking resemblance with those reported in cuprate, iron-pnictide and heavy fermion superconductors, demonstrating that the critical fluctuations of a nematic order with $\mathbf{q}\approx 0$ can also lead to a breakdown of the Fermi liquid description.

8 pages, 4 + 1 figures

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• Two superconducting states with broken time-reversal symmetry in FeSe1-xSx
• Hydrothermal synthesis and complete phase diagram of FeSe${}_{1-x}$S${}_x$ $(0\le x\le 1)$ single crystals
• Superconductivity Mediated by Nematic Fluctuations in Tetragonal $\text{Fe}{\text{Se}}_{1-x}{\text{S}}_x$
• Enhanced superconducting pairing strength near a nonmagnetic nematic quantum critical point
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• Hall anomaly, Quantum Oscillations and Possible Lifshitz Transitions in Kondo Insulator YbB${}_{12}$: Evidence for Unconventional Charge Transport
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• Abnormal Normal State and Pressure-driven Reentrant Superconductivity in the Heavy $d$-electron Superconductor Rh${}_{17}$S${}_{15}$
• Charge Transport in Ba${}_{1-x}$Rb${}_x$Fe${}_2$As${}_2$ Single Crystals
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