Fermi Surfaces of Flat-Band Intermetallic APd3 (A = Pb, Sn)

ORAL

Abstract

DFT calculations for APd3 (A=Pb, Sn) recently revealed an interesting band structure [1] that includes: a dispersionless branch along the Γ-X line, that could result in a large DOS near EF, and Dirac-like surface states. To test these predictions, we synthesized single crystals of PbPd3 and SnPd3 using the Czochralski growth technique and performed magnetoresistance and torque magnetometry measurements in magnetic fields up to 45 T. Through analysis of quantum oscillations, we uncover Fermi surface topographies that suggest the EF is roughly 50 meV above the flat band for PbPd3. 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 also limited due to it being several hundred meV above EF. We will discuss detailed results of the Fermi surface topology measurements and prospects for tuning the EF to meet either the flat bands or the Dirac cone.
[1] K. Ahn et al, PRB 98, 035130(2018).

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Presenters

  • Kaya Wei

    National High Magnetic Field Laboratory, Florida State University, NHMFL

Authors

  • Kaya Wei

    National High Magnetic Field Laboratory, Florida State University, NHMFL

  • Kuan-Wen Chen

    Florida State University

  • Jennifer Neu

    Physics, Florida State University; NHMFL, Tallahassee, FL, United States, Florida State University, National High Magnetic Field Laboratory

  • You Lai

    Florida State University, National High Magnetic Field Laboratory

  • Greta Chappell

    Florida State University, National High Magnetic Field Laboratory, National High Magnetic Field Laboratory and Florida State University

  • Yan Xin

    National High Magnetic Field Laboratory

  • David E Graf

    National High Magnetic Field Laboratory, National High Magnetic Field Lab, Tallahassee, FL, National High Magnetic Field Laboratory and Department of Physics, Florida State University, National High Magnetic Field Lab, NHMFL, Tallahassee, FL, United States, Florida State University, National High Magnetic Field Laboratory, Florida State University, NHMFL-FSU, National High Magnetic Field Laboratory and Florida State University, NHMFL

  • Luis Balicas

    National High Magnetic Field Laboratory, Tallahassee, FL-32310, USA., National High Magnetic Field Laboratory, National High Magnetic Field Laboratory FSU, National High Magnetic Field Lab, Florida State University, Tallahassee, USA, NHMFL

  • Ryan Baumbach

    National High Magnetic Field Laboratory, Florida State University, Florida State University, NHMFL-FSU, National High Magnetic Field Laboratory, National High Magnetic Field Laboratory and Florida State University, National High Magnetic Field Laboratory - Florida State University, NHMFL

  • Theo Siegrist

    National High Magnetic Field Laboratory, Florida State University