Emergent Properties of Chalcogenide Superconductors

In the recent past we have witnessed some exceptional developments in chalcogenide materials.  The age-old industrial thermoelectric materials based on selenides and tellurides have been turned into toplogical insulators and Weyl semi-metals. Superconductivity derived from such exotic systems promises to usher-in new understanding of correlated electronic systems.  In particular, layered chalcogenides are now considered the warehouse of unconventional superconductivity.  In this talk we shall review superconducting properties of three different families of layered chalcogenides involving Sulfur (S), Selenium (Se), and Tellurium (Te). These comprise the first BiS2 based superconductor Bi4O4S3, the simplest iron based superconductors FeTe1-xSex, and Sr intercalated Bi2Se3 superconductor. The synthesis method for single crystals and electromagnetic characterization shall be discussed in details. Determination of important fundamental parameters such as upper critical field anisotropy and coherence length will be summarized. The insight from the temperature dependent Hall and Seebeck coefficient and London penetration depth measurements will also be discussed.

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