Ground state of Ce 3 Bi 4 Pd 3 unraveled by hydrostatic pressure
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Noncentrosymmetric Ce3Bi4Pd3 has attracted a lot of attention as a candidate for strongly correlated topological material, yet its experimental ground state remains a matter of contention. Two conflicting scenarios have emerged from a comparison to the prototypical Kondo insulator Ce3Bi4Pd3: Either Ce3Bi4Pd3 is a spin-orbit-driven topological semimetal or a Kondo insulator with smaller Kondo coupling than its Pt counterpart. Here, we determine the ground state of Ce3Bi4Pd3 via electrical resistivity measurements under hydrostatic pressure, which is a clean symmetry-preserving tuning parameter that increases hybridization but virtually preserves spin-orbit coupling. Ce3Bi4Pd3 becomes more insulating under pressures up to 2.3 GPa, which is a signature of Ce-based Kondo insulating materials in the considered pressure range. Its small zero-pressure gap increases quadratically with pressure, similar to the behavior observed in the series Ce3Bi4(Pt1 - x Pdx)3, which indicates that Pt substitution and applied pressure have a similar effect. Finally, our result not only demonstrates that Kondo coupling, rather than spin-orbit coupling, is the main tuning parameter in this class of materials, but it also establishes that Ce3Bi4Pd3 has a narrow-gap Kondo insulating ground state.
- Research Organization:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Organization:
- USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Laboratory Directed Research and Development (LDRD) Program
- Grant/Contract Number:
- 89233218CNA000001
- OSTI ID:
- 1893672
- Alternate ID(s):
- OSTI ID: 1891540
- Report Number(s):
- LA-UR-21-30470; TRN: US2310213
- Journal Information:
- Physical Review. B, Vol. 106, Issue 16; ISSN 2469-9950
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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