The strange metal Hall effect connects quantum criticality and superconductivity in an iron-based superconductor

Abstract

Many unconventional superconductors exhibit a common set of anomalous charge transport properties that characterize them as `strange metals', which provides hope that there is single theory that describes them. However, model-independent connections between the strange metal and superconductivity have remained elusive. In this letter, we show that the Hall effect of the unconventional superconductor BaFe${}_2$(As${}_{1-x}$P${}_x$)${}_2$ contains an anomalous contribution arising from the correlations within the strange metal. This term has a distinctive dependence on magnetic field, which allows us to track its behavior across the doping-temperature phase diagram, even under the superconducting dome. These measurements demonstrate that the strange metal Hall component emanates from a quantum critical point and, in the zero temperature limit, decays in proportion to the superconducting critical temperature. This creates a clear and novel connection between quantum criticality and superconductivity, and suggests that similar connections exist in other strange metal superconductors.

11 pages, 3 Figures, Supplementary Information on request

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• Phenomenology of the normal state in-plane transport properties of high-$T_c$ cuprates
• Correlation between $T_c$ and anisotropic scattering in Tl${}_2$Ba${}_2$CuO${}_{6+\delta }$
• Enhanced Fermi surface nesting in superconducting BaFe${}_2$(As${}_{1-x}$P${}_x$)${}_2$ revealed by de Haas-van Alphen effect
• Unconventional Hall effect in pnictides from interband interactions

Cited by in corpus (10)

• Incoherent transport across the strange metal regime of highly overdoped cuprates
• A strange metal in a bosonic system
• Hall anomaly, Quantum Oscillations and Possible Lifshitz Transitions in Kondo Insulator YbB${}_{12}$: Evidence for Unconventional Charge Transport
• Transition between heavy-fermion strange metal and quantum spin liquid in a 4d-electron trimer lattice
• Doping asymmetry in the three-band Hamiltonian for cuprate ladders: failure of the standard model of superconductivity in cuprates
• Nematic phases and elastoresistivity from a multiorbital non-Fermi liquid
• An effective framework for strange metallic transport
• Transport anomalies in multiband superconductors near quantum critical point
• Longitudinal Magnetoresistance in YBa${}_2$Cu${}_3$O${}_7$ at High Magnetic Fields of up to 100 T
• Thermoelectric effect on diffusion in the two-dimensional Hubbard model