No pseudogap magnetism detected in optimally to heavily overdoped Bi<sub>2+<i>x</i></sub>Sr<sub>2-<i>x</i></sub>CaCu<sub>2</sub>O<sub>8+</sub><sub>d</sub> single crystals by μSR

ORAL

Abstract

Weak, temperature-dependent, quasi-static magnetism has been detected within the pseudogap (PG) phase of optimally-doped (Tc = 91 K) and overdoped (Tc = 80 K) Bi2+xSr2-xCaCu2O8+d (Bi2212) single crystals by zero-field (ZF) muon spin relaxation (mSR) [A. Pal et al., Phys. Rev. B 97, 060502(R) (2018)]. However, in this study it was not possible to determine whether the magnetism onsets at the PG temperature (T*) due to the occurrence of muon diffusion above T ~ 150 K. To address this issue, we performed a similar ZF-mSR investigation of overdoped single crystals (Tc = 70 K and 55 K) in which T* lies below the muon diffusion temperature. The results are similar to that obtained for the lower doped samples, indicating that the anomalous magnetism is independent of hole-doping concentration and thus apparently not associated with the PG. We have carried out additional ZF-mSR measurements on these samples using an ultra-low background spectrometer. The new measurements verify the source of the magnetism comes from the Bi2212 samples. Potential origins of the anomalous magnetism will be discussed.

*Acknowledged support from Natural Sciences and Engineering Research Council of Canada (NSERC).

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Presenters

  • Shayan Gheidi

    • Simon Fraser Univ
    • Physics, Simon Fraser University
    • Department of Physics, Simon Fraser University, Burnaby, British Columbia V5A 1S6, Canada

Authors

  • Shayan Gheidi

    • Simon Fraser Univ
    • Physics, Simon Fraser University
    • Department of Physics, Simon Fraser University, Burnaby, British Columbia V5A 1S6, Canada

  • Andre M Côté

    • Simon Fraser Univ
    • Department of Physics, Simon Fraser University, Burnaby, British Columbia V5A 1S6, Canada

  • Sarah Dunsiger

    • CMMS, TRIUMF
    • TRIUMF
    • Centre for Molecular and Materials Science, TRIUMF, Vancouver, British Columbia V6T 2A3, Canada

  • Kolawole Abayomi Akintola

    • Simon Fraser Univ

  • Alex Fang

    • Simon Fraser Univ

  • Shyam Sundar

    • Simon Fraser Univ
    • Physics, Simon Fraser University
    • Department of Physics, Simon Fraser University, Burnaby, British Columbia V5A 1S6, Canada

  • Genda Gu

    • Brookhaven National Laboratory
    • Condensed Matter Physics and Materials Science Division, Brookhaven National Laboratory
    • Brookhaven national lab
    • Condensed Matter Physics and Materials Science, Brookhaven National Laboratory
    • Brookhaven National Lab
    • Condensed Matter Physics and Material Science, Brookhaven National Laboratory, Upton, NY, United States
    • Brookhaven National Laboratories
    • Condensed Matter Physics and Material Science Division, Brookhaven National Laboratory

  • Jeff Sonier

    • Simon Fraser Univ
    • Physics, Simon Fraser University
    • Department of Physics, Simon Fraser University, Burnaby, British Columbia V5A 1S6, Canada