Non-Fermi liquid transport in the vicinity of the nematic quantum critical point of superconducting <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>Fe</mml:mi><mml:msub><mml:mi>Se</mml:mi><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mi mathvariant="normal">S</mml:mi><mml:mi>x</mml:mi></mml:msub></mml:mrow></mml:math>
Wantong Huang, S. Hosoi, Matija Čulo, S. Kasahara, Yuki Sato, K. Matsuura, Yuta Mizukami, Maarten Berben, N. E. Hussey, Hiroshi Kontani, T. Shibauchi, Yuji Matsuda
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 xx T , which is close to the Planckian limit, the Hall angle varies as cot H T 2 and the low-field magnetoresistance is well scaled as xx / xx tan 2 H 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.