Strontium intercalation between van der Waals bonded layers of topological insulator Bi 2 Se 3 is found to induce superconductivity with a maximum T c of 2.9 K. Transport measurement on single crystal of optimally doped sample Sr 0.1 Bi 2 Se 3 shows weak anisotropy ( 1.5) and upper critical field H c2 (0) Superconductors derived from topological insulating phases of quantum matter are amongst the most profound developments of recent past.

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We report synthesis of non-centrosymmetric BiPd single crystal by self flux method. The BiPd single crystal is crystallized in monoclinic structure with the P2 1 space group. Detailed SEM (Scanning Electron Microscopy) results show that the crystals are formed in slab like morphology with homogenous distribution of Bi and Pd. The magnetic susceptibility measurement confirmed that the BiPd compound is superconducting below 4K. Further, BiPd exhibits weak ferromagnetism near the superconducting transition temperature in isothermal magnetization (MH) measurements. The temperature dependent electrical resistivity also confirmed that the BiPd single crystal is superconducting at T c =4K. Magneto transport measurements showed that the estimated H c2 (0) value is around 7.0kOe. We also obtained a sharp peak in heat capacity Cp(T) measurements at below 4K due to superconducting ordering. The normalized specific-heat jump, C/γT c , is 1.52, suggesting the BiPd to be an intermediate BCS coupled superconductor. The pressure dependent electrical resistivity shows the T c decreases with increasing applied pressure and the obtained dT c /dP is -0.62K/Gpa.

PACS 74.25.-q-Properties of superconductors PACS 74.25.Ha-Magnetic properties including vortex structures and related phenomena PACS 73.20.-r-Electron states at surfaces and interfaces Abstract-We report on the superconducting properties of indium-doped SnTe. SnTe has recently been explored as a topological crystalline insulator. Single crystals of Sn0.5In0.5Te have been synthesized by a modified Bridgman method. Resistivity measurement performed in the range 1.6-300 K shows a metallic normal state with onset of superconducting transition at Tc = 4.5 K. Bulk superconductivity has also been confirmed by DC magnetization, AC susceptibility and rf penetration depth measurements. Zero-temperature upper critical field, lower critical field, coherence length, and penetration depth are estimated to be 1.6 T, 1 mT, 143.5Å and 853 nm, respectively. The temperature dependence of the low-temperature penetration depth indicates S-wave fully gapped characteristics with BCS (Bardeen-Cooper-Schrieffer) gap Δ0 = 1.247 meV. Hall and Seebeck coefficient measurements confirm the dominance of hole conduction with possible phonon-drag effects around ∼45 K. Resistive transition studied under applied magnetic field shows thermally activated flux flow behaviour.