Exploring the Dirac nature of RbBi2

Philip, Sharon S.; Liu, S.; Teo, Jeffrey Y.; Balachandran, P. V.; Louca, Despina

doi:10.1103/physrevb.107.035143

Exploring the Dirac nature of RbBi2

Journal Article · Tue Jan 24 00:00:00 EST 2023 · Physical Review. B

DOI:https://doi.org/10.1103/physrevb.107.035143· OSTI ID:2418947

^[1]; ^[2]; Teo, Jeffrey Y. ^[2]; Balachandran, P. V. ^[2]; ^[2]

Univ. of Virginia, Charlottesville, VA (United States); OSTI
Univ. of Virginia, Charlottesville, VA (United States)

Characteristics of topological semimetals such as a nonsaturating magnetoresistance (MR), a field-induced metal to semiconducting crossover and a robust resistivity plateau are observed under a magnetic field in type-I RbBi₂ bulk superconductor with $$\mathrm{T}$$_c = 4.15 K. The MR exhibits a notable 3500% increase at 2 K and 9 T and the resistivity follows a power law temperature dependence, while the MR ∝ $$\mathrm{H}$$^1.26, indicating weak carrier compensation. Further, first principles calculations provided insights into the dynamical stability of the cubic structure at 0 K. Both hole and electron pockets are observed at the Fermi surface. The electron-phonon interaction constant indicates weak coupling strength (<1) that leads to a maximum predicted $$\mathrm{T}$$_c of 2.852 K. Just below the Fermi level, E_F, the electronic band structure consists of linear band crossings at the $$\mathrm{X}$$ points in the Brillouin zone (BZ) corresponding to massless, symmetry-protected Dirac fermions.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of Virginia, Charlottesville, VA (United States)

Sponsoring Organization:: National Science Foundation (NSF); USDOE Office of Science (SC)

Grant/Contract Number:: FG02-01ER45927

OSTI ID:: 2418947

Journal Information:: Physical Review. B, Journal Name: Physical Review. B Journal Issue: 3 Vol. 107; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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