Non-Fermi liquid transport in the vicinity of the nematic quantum critical point of superconducting FeSe1-xSx (CROSBI ID 298257)
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Huang, WK ; Hosoi, S ; Čulo, Matija ; Kasahara, S ; Sato, Y ; Matsuura, K ; Mizukami, Y ; Berben, M ; Hussey, NE ; Kontani, H ; Shibauchi, T ; Matsuda, Y ;
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Non-Fermi liquid transport in the vicinity of the nematic quantum critical point of superconducting FeSe1-xSx
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 FeSe1−xSx 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 ρxx ∝ T, which is close to the Planckian limit, the Hall angle varies as cot θH ∝ T 2 and the low-field magnetoresistance is well scaled as Delta ρxx/ρxx ∝ tan2 θH in the vicinity of the nematic quantum critical point. This set of anomalous charge transport properties show striking resemblance with those reported in cuprate, iron-pnictide, and heavy fermion superconductors, demonstrating that the critical fluctuations of a nematic order with q ≈ 0 can also lead to a breakdown of the Fermi liquid description.
strange metal ; Fermi liquid ; quantum critical point ; nematic order ; Planckian limit ; Hall angle ; magnetoresistance ; critical fluctuations
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