HfTe5

HfTe5is a member of layered transition metal pentatelluride material family. It crystallizes in orthorhombic phase and our crystals exhibit perfectly layered nature.HfTe5is at the boundary of weak & strong topological insulator (TI) and might crossover to a Dirac semimetal. It also exhibit superconducting state under applied hydrostatic pressure. Our crystals are grown slowly in 2 months time period using our own growth techniques using 6N purity precursors. Resulting crystals have mm size single domains (world record), perfectly layered nature (ideal for exfoliation and large area monolayer production). The material exfoliates rather easily but in air the surface transforms into TeO2 or other tellurium oxide complexes due to high electron affinity of Hf andHfTe5surfaces. Bulk crystals are stable in air but monolayer require handling in the glovebox or inert gas conditions. Samples are shipped under microTorr pressure sample boxes back-filled with Ar to safely ship the samples.

Samples can be easily exfoliated intoHfTe5sheets wherein eachHfTe5chain is quasi-weakly bonded to each other.