Signatures of a quantum Griffiths phase close to an electronic nematic quantum phase transition
2021
In the vicinity of a quantum critical point, quenched disorder can lead to a quantum Griffiths
phase, accompanied by an exotic power-law scaling with a continuously varying dynamical exponent
that diverges in the zero-temperature limit. Here, we investigate a nematic quantum critical point
in the iron-based superconductor FeSe0.89S0.11 using applied hydrostatic pressure. We report an
unusual crossing of the magnetoresistivity isotherms in the non-superconducting normal state which
features a continuously varying dynamical exponent over a large temperature range. We interpret
our results in terms of a quantum Griffiths phase caused by nematic islands that result from the
local distribution of Se and S atoms. At low temperatures, the Griffiths phase is masked by the
emergence of a Fermi liquid phase due to a strong nematoelastic coupling and a Lifshitz transition
that changes the topology of the Fermi surface.
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