Signatures of a strange metal in a bosonic system

Article

关键词: SUPERCONDUCTOR-INSULATOR TRANSITION;    QUANTUM CRITICALITY;    TEMPERATURE;    STATE;    FLUCTUATIONS;    DISSIPATION;    TRANSPORT;    SCATTERING;    PSEUDOGAP;    VISCOSITY;   

DOI  :  10.1038/s41586-021-04239-y

来源: SCIE

【 摘 要 】

Fermi liquid theory forms the basis for our understanding of the majority of metals: their resistivity arises from the scattering of well defined quasiparticles at a rate where, in the low-temperature limit, the inverse of the characteristic time scale is proportional to the square of the temperature. However, various quantum materials(1-15)-notably high-temperature superconductors(1-10)-exhibit strange-metallic behaviour with a linear scattering rate in temperature, deviating from this central paradigm. Here we show the unexpected signatures of strange metallicity in a bosonic system for which the quasiparticle concept does not apply. Our nanopatterned YBa2Cu3O7-delta (YBCO) film arrays reveal linear-in-temperature and linear-in-magnetic field resistance over extended temperature and magnetic field ranges. Notably, below the onset temperature at which Cooper pairs form, the low-field magnetoresistance oscillates with a period dictated by the superconducting flux quantum, h/2e (e, electron charge; h, Planck's constant). Simultaneously, the Hall coefficient drops and vanishes within the measurement resolution with decreasing temperature, indicating that Cooper pairs instead of single electrons dominate the transport process. Moreover, the characteristic time scale tau in this bosonic system follows a scale-invariant relation without an intrinsic energy scale: h/tau approximate to a(k(B)T + gamma mu B-B), where h is the reduced Planck's constant, a is of order unity(7,8,11,12), k(B) is Boltzmann's constant, T is temperature, mu(B) is the Bohr magneton and gamma approximate to 2. By extending the reach of strange-metal phenomenology to a bosonic system, our results suggest that there is a fundamental principle governing their transport that transcends particle statistics.

【 授权许可】

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