Investigations of the pseudogap phase in overdoped Bi<sub>2+x</sub>Sr<sub>2−x</sub>CaCu<sub>2</sub>O<sub>8+δ</sub> with μSR

ORAL

Abstract

A recent μSR study of Bi2+xSr2−xCaCu2O8+δ (Bi2212) single crystals revealed the presence of weak quasi-static magnetism in the pseudogap (PG) phase [A. Pal et al., Phys. Rev. B 97, 060502(R) (2018)]. However, it is unclear whether the magnetism is associated with the PG, as muon diffusion above T ~ 160 K prevented determination of an onset temperature. In an attempt to circumvent this limitation, we have carried out sensitive muon Knight-shift and new zero-field muon spin relaxation (ZF-μSR) measurements of overdoped Bi2212. The temperature dependence of the muon-Knight shift in the normal state exhibits a saturation below a temperature that scales with Tc, whereas the ZF-μSR relaxation rate appears to track the hole-doping dependence of the PG temperature T*. In addition, our measurements of highly overdoped Bi2212 provide evidence for phase separation. The results suggest the presence of two distinct phases above Tc.

*This work is supported by the Natural Sciences and Engineering Research Council of Canada (NSERC) and the Canadian Institute for Advanced Research (CIFAR).

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Presenters

  • Shayan Gheidi

    • Department of Physics, Simon Fraser University
    • Simon Fraser University

Authors

  • Shayan Gheidi

    • Department of Physics, Simon Fraser University
    • Simon Fraser University

  • Kolawole Abayomi Akintola

    • Simon Fraser University

  • Andre Cote

    • Kwantlen Polytechnic University

  • Alex Fang

    • Department of Physics, Simon Fraser University
    • Simon Fraser University

  • Sarah R Dunsiger

    • TRIUMF

  • Jeff Sonier

    • Department of Physics, Simon Fraser University
    • Simon Fraser University