Transport and spectroscopic investigations of topological materials under pressure

Přednášející: Utpal Dutta, Postdoctoral research Scholar, University of Alabama at Birmingham, USA

Abstract (pouze anglicky):

The recently discovered various type of topologically non trivial compounds show numerous fascinating high pressure phenomena including pressure-induced superconductivity, insulator-to-metal transitions, structural phase transition, electronic topological transition, and quantum critical behavior. Here, I will present the transport and spectroscopic investigations of some topologically non-trivial compounds under extreme conditions of high pressure (up to ~45 GPa), low temperature (down to 1.5 K) and high magnetic field (up to 7 T). First, I will present an overview and background of the topological systems and a brief review of how pressure induces various novel phenomena in these compounds. Then, I will discuss how the various high pressure techniques viz., four probe electrical resistance and magnetoresistance, SQUID based magnetization, X-ray diffraction and IR reflectance measurement techniques have been carried out to study the electronic, and structural evolution of the topological compounds under pressure. Detailed investigations of pressure induced superconductivity in 1T-TiTe₂ will be discussed. I will also briefly summarize the important results of the other compounds such as Sb₂S₃, AgBiSe₂and NbP.