# Unusual Properties in Rare Earth Tritellurides

Recently, many papers have been revisiting the rare earth tritelluride materials. They were first pointed out to host charge density waves in this paper (sorry paywall!). In present times, the Fisher group at Stanford has revitalized the study of these compounds.

There is a particularly interesting paper here on TbTe$_3$ demonstrating the existence of superconductivity in this material under pressure. Just as a little bit of background, TbTe$_3$ forms a charge density wave (unidirectional in a quasi-square lattice!) at ~340K and orders antiferromagnetically at ~6K. Under pressure, the charge density wave begins to get suppressed, the antiferromagnetism is enhanced slightly and then superconductivity is found at ~2.3 GPa.

Startlingly, at 2.3 GPa, there is a co-existence of charge density wave, antiferromagnetic and superconducting orders. The superconducting T$_c$ peaks at ~4K at 12.4 GPa. One cannot fight the urge to draw comparisons with high-temperature superconductors…