Tuning the Fermi level to access the flat bands in PbPd3

ORAL

Abstract

PbPd3 has been reported to host an interesting band structure that includes a dispersionless branch along the Γ-X line that could result in a large DOS near the EF and Dirac-like surface states.[1] Previous results on the Fermi surface topography of PbPd3 suggest that the EF is roughly 50 meV above the flat bands.[2] This results in the flat bands only having a weak effect on the bulk properties, while the impact of the Dirac cone at the Γ-point is limited due to it being several hundred meV above the EF. In order to access the flat bands, we doped Au on the Pb site to lower the EF. As a result, a significantly enhanced thermopower has been achieved. Furthermore, we performed magnetoresistance and torque magnetometry measurements in magnetic fields up to 45 T to reveal the change in the Fermi surface as a result of doping. We will discuss detailed results of the Fermi surface topology measurements on these doped series and prospects for tuning the EF in the opposite direction to meet the Dirac cone.
[1] K. Ahn et al.,PRB 98,035130(2018).
[2] K. Wei et al.,PRM 3,041201(R)(2019).

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Presenters

  • Kaya Wei

    Florida State Univ, Natl High Magnetic Field Lab, National High Magnetic Field Laboratory, Florida State University, National High Magnetic Field Laboratory, Florida State University, Tallahassee, FL, USA.

Authors

  • Kaya Wei

    Florida State Univ, Natl High Magnetic Field Lab, National High Magnetic Field Laboratory, Florida State University, National High Magnetic Field Laboratory, Florida State University, Tallahassee, FL, USA.

  • Jennifer Neu

    National High Magnetic Field Laboratory, Florida State Univ, Natl High Magnetic Field Lab, National High Magnetic Field Laboratory, Florida State University

  • Greta Chappell

    National High Magnetic Field Lab, Florida State University, National High Magnetic Field Laboratory, Florida State Univ, National High Magnetic Field Laboratory, Florida State University

  • Benny Schundelmier

    Florida State Univ, Physics, University of West Florida, Univ of West Florida

  • Chris Mann

    Florida State Univ, University of Florida

  • David E Graf

    Florida State University, National High Magnetic Field Laboratory, Florida State University, Department of Physics, National High Magnetic Field Laboratory, Florida State University, Florida, USA, National High Magnetic Field Laboratory, National High Magnetic Field Lab, Florida State University, National High Magnetic Field Laboratory and Department of Physics, Florida State University, Florida State Univ, Natl High Magnetic Field Lab, National High Magnetic Field Lab, Tallahassee, FL 32310, USA, National High Magnetic Field Laboratory, 1800 E. Paul Dirac Drive, Tallahassee, FL 32310, USA, National High Magnetic Field Laboratory-Florida State University, National High Magnetic Field Laboratory, Tallahassee, FL, NHMFL, Florida State University, NHMFL

  • Eun Sang Choi

    Department of Physics, National High Magnetic Field Laboratory, Florida State University, Florida, USA, National High Field Magnet Laboratory, National High Magnetic Field Laboratory, Florida State University, National High Magnetic Field Laboratory, Florida State University, National High Magnetic Field Lab

  • Theo Siegrist

    Florida State Univ, National High Magnetic Field Laboratory, Natl High Magnetic Field Lab, Chemical and Biomedical Engineering, FAMU-FSU College of Engineering, National High Magnetic Field Laboratory, Florida State University, Tallahassee, FL, USA.; Department of Chemical and Biomedical Engineering, FAMU-FSU College of Engineering,

  • Ryan Baumbach

    National High Magnetic Field Laboratory/Florida State University, MagLab Tallahassee, National High Magnetic Field Laboratory, National High Magnetic Field Lab, Florida State University, Florida State Univ, Natl High Magnetic Field Lab, National High Magnetic Field Laboratory, Florida State University, Physics, NHMFL, Florida State University