Superconductivity by Sr intercalation in the layered topological insulator Bi2Se3
Shruti, V. K. Maurya, P. Neha, P. Srivastava, S. Patnaik
DOI 10.1103/PhysRevB.92.020506 · Physical Review B
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Abstract
Strontium intercalation between van der Waals bonded layers of the topological insulator Bi2Se3 is found to induce superconductivity with a maximum Tc of 2.9 K. Transport measurement on a single crystal of the optimally doped sample Sr0.1Bi2Se3 shows weak anisotropy (Γ∼1.5) and an upper critical field Hc2(0) equal to 2.1 T for a magnetic field applied perpendicular to the c axis of the sample. The Ginzburg-Landau coherence lengths are found to be ξab=15.3 nm and ξc=10.2 nm. The lower critical field Hc1,ab(0) and zero temperature penetration depth λab(0) are estimated to be 0.39±0.02 mT and 1221±36 nm, respectively. Hall and Seebeck measurements confirm the dominance of electronic conduction, and the carrier concentration is surprisingly low (n=1.85×1019cm−3) at 10 K, indicating the possibility of unconventional superconductivity.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Sr0.1Bi2Se3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.9 | Pressure not reported | unknown |
| Sr0.1Bi2Se3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.67 | Pressure not reported | onset |
| Sr0.1Bi2Se3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.94 | Pressure not reported | onset |
| Sr0.1Bi2Se3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.8 | Pressure not reported | zero_resistance |
| SrxBi2Se3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.75 | Pressure not reported | unknown |
| CuxBi2Se3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3.5 | Pressure not reported | unknown |
| SnTe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4.5 | Pressure not reported | unknown |
| SrxBi2Se3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.5 | Pressure not reported | unknown |
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