Tuning the Fermi level to access the flat bands in PbPd<sub>3</sub>
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).
[1] K. Ahn et al.,PRB 98,035130(2018).
[2] K. Wei et al.,PRM 3,041201(R)(2019).
*NHMFL is supported by National Science Foundation through NSF/DMR-1644779 and the State of Florida. KW acknowledges support of the Jack E. Crow Fellowship. JN and TS acknowledge support from NSF/DMR-1606952.
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Presenters
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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.