Dirac fermions and superconductivity in the homologous structures (AgxPb1−xSe)5(Bi2Se3)3m (m=1,2)
L. Fang, C. C. Stoumpos, Y. Jia, A. Glatz, D. Y. Chung, H. Claus, U. Welp, W.-K. Kwok, M. G. Kanatzidis
DOI 10.1103/PhysRevB.90.020504 · Physical Review B
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Abstract
A newly discovered topological insulator (TI) (AgxPb1−xSe)5(Bi2Se3)3m (m=2) has a band gap of 0.5 eV, the largest value reported in topological insulators. We present a magnetotransport study of the Dirac electrons of this compound in the quantum diffusion regime. Two-dimensional weak antilocalization due to the destructive interference of the Dirac electrons was observed. The phase coherence length of the Dirac electrons is independent of doping and disorder levels. This provides an indication of the backscattering immunity under the protection of time reversal invariance of the TI. We further report that the homologous compound (AgxPb1−xSe)5(Bi2Se3)3m (m=1) is a superconductor with a transition temperature TC=1.7 K. The related structures of these two phases allow lateral intergrowth of crystals to occur naturally, offering a potential platform to observe the Majorana fermion state at the boundary of two intergrown crystals.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| (AgxPb1-xSe)5(Bi2Se3)3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.7 | Pressure not reported | onset |
| (Ag0.2Pb0.8Se)5(Bi2Se3)3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.6 | Pressure not reported | onset |
| (Ag0.2Pb0.8Se)5(Bi2Se3)3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.55 | Pressure not reported | zero_resistance |
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