High-pressure synthesis techniques have allowed for the growth of Sn1-xInxTe samples beyond the ambient In-saturation limit of x=0.5 (Tc∼4.5 K). In this study we present measurements of the temperature dependence of the London penetration depth Δλ(T) in this superconducting doped topological insulator for x=0.7, where Tc,onset≈5 K. The results indicate fully gapped BCS-like behavior, ruling out odd-parity A2u pairing; however, odd-parity A1u pairing is still possible. Critical field values measured below 1 K and other superconducting parameters are also presented.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics