Fermi Surfaces of Flat-Band Intermetallic <i>A</i>Pd<sub>3</sub> (<i>A </i>= 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).
[1] K. Ahn et al, PRB 98, 035130(2018).
*The National High Magnetic Field Laboratory is supported by National Science Foundation through NSF/DMR-1644779 and the State of Florida. KW acknowledges support from the Jack E. Crow Fellowship. LB acknowledges support from DOE-BES (No. DE-SC0002613). TS acknowledges support from NSF under grant DMR-1534818 and DMR-1849539.
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Presenters
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Kaya Wei
- National High Magnetic Field Laboratory
- Florida State University
- NHMFL