Fermi surface of the flat-band intermetallics
Abstract
The intermetallic phases APd3 (A = Pb, Sn) were recently predicted to host an unconventional combination of unique electronic structure features, namely, flat bands near the Fermi energy coexisting with topologically protected surface states at the Gamma point. These features each could independently produce alternative electronic states, including electronically or magnetically ordered states coexisting with unconventional edge dominated transport and a significantly large thermopower coexisting with topological characteristics. To explore these expectations, we report the synthesis, structural/chemical characterization, electrical and thermal transport properties, magnetic torque (up to 45 T), and Fermi surface mapping for single crystals produced using the Czochralski technique. X-ray diffraction and scanning transmission electron microscope measurements establish the absence of defects, while small measured values of the thermopower indicate that the Fermi level is located away from the flat-band region. The electronic properties are further clarified by the topography of the Fermi surfaces, measured through the de Haas–van Alphen effect. We find that the Fermi levels are placed at higher energy values than the original ones resulting from the density functional theory calculations, 54 meV higher for PbPd3 and 68 meV higher for SnPd3. Furthermore, the molten flux method was used to synthesize PbPd3, yielding nearly identicalmore »
- Authors:
-
- Florida State Univ., Tallahassee, FL (United States). National High Magnetic Field Lab. (MagLab)
- Univ. of South Florida, Tampa, FL (United States). Dept. of Physics
- Publication Date:
- Research Org.:
- Florida State Univ., Tallahassee, FL (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)
- OSTI Identifier:
- 1594438
- Alternate Identifier(s):
- OSTI ID: 1504801
- Grant/Contract Number:
- SC0002613
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review Materials
- Additional Journal Information:
- Journal Volume: 3; Journal Issue: 4; Journal ID: ISSN 2475-9953
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Citation Formats
Wei, Kaya, Chen, Kuan-Wen, Neu, Jennifer N., Lai, You, Chappell, Greta L., Nolas, George S., Graf, David E., Xin, Yan, Balicas, Luis, Baumbach, Ryan E., and Siegrist, Theo. Fermi surface of the flat-band intermetallics APd3 (A=Pb,Sn). United States: N. p., 2019.
Web. doi:10.1103/PhysRevMaterials.3.041201.
Wei, Kaya, Chen, Kuan-Wen, Neu, Jennifer N., Lai, You, Chappell, Greta L., Nolas, George S., Graf, David E., Xin, Yan, Balicas, Luis, Baumbach, Ryan E., & Siegrist, Theo. Fermi surface of the flat-band intermetallics APd3 (A=Pb,Sn). United States. https://doi.org/10.1103/PhysRevMaterials.3.041201
Wei, Kaya, Chen, Kuan-Wen, Neu, Jennifer N., Lai, You, Chappell, Greta L., Nolas, George S., Graf, David E., Xin, Yan, Balicas, Luis, Baumbach, Ryan E., and Siegrist, Theo. Wed .
"Fermi surface of the flat-band intermetallics APd3 (A=Pb,Sn)". United States. https://doi.org/10.1103/PhysRevMaterials.3.041201. https://www.osti.gov/servlets/purl/1594438.
@article{osti_1594438,
title = {Fermi surface of the flat-band intermetallics APd3 (A=Pb,Sn)},
author = {Wei, Kaya and Chen, Kuan-Wen and Neu, Jennifer N. and Lai, You and Chappell, Greta L. and Nolas, George S. and Graf, David E. and Xin, Yan and Balicas, Luis and Baumbach, Ryan E. and Siegrist, Theo},
abstractNote = {The intermetallic phases APd3 (A = Pb, Sn) were recently predicted to host an unconventional combination of unique electronic structure features, namely, flat bands near the Fermi energy coexisting with topologically protected surface states at the Gamma point. These features each could independently produce alternative electronic states, including electronically or magnetically ordered states coexisting with unconventional edge dominated transport and a significantly large thermopower coexisting with topological characteristics. To explore these expectations, we report the synthesis, structural/chemical characterization, electrical and thermal transport properties, magnetic torque (up to 45 T), and Fermi surface mapping for single crystals produced using the Czochralski technique. X-ray diffraction and scanning transmission electron microscope measurements establish the absence of defects, while small measured values of the thermopower indicate that the Fermi level is located away from the flat-band region. The electronic properties are further clarified by the topography of the Fermi surfaces, measured through the de Haas–van Alphen effect. We find that the Fermi levels are placed at higher energy values than the original ones resulting from the density functional theory calculations, 54 meV higher for PbPd3 and 68 meV higher for SnPd3. Furthermore, the molten flux method was used to synthesize PbPd3, yielding nearly identical Fermi surfaces between the specimens grown using different synthesis techniques, indicating the robustness of the Fermi level position. According to the density functional theory calculations, the flat band is mainly formed by the 4d bands of Pd. Thus, we propose monovalent doping on the Pb/Sn site as a viable approach to accessing the flat band while maintaining the unique band structure features of these compounds.},
doi = {10.1103/PhysRevMaterials.3.041201},
journal = {Physical Review Materials},
number = 4,
volume = 3,
place = {United States},
year = {Wed Apr 03 00:00:00 EDT 2019},
month = {Wed Apr 03 00:00:00 EDT 2019}
}
Web of Science
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