New sustainable ternary copper phosphide thermoelectrics.

The thermoelectric performance of ACuP (A = Mg and Ca) with abundant elements and low gravimetric density is reported. Both systems are p-type doped by intrinsic Cu vacancy defects, have large power factors and promising figures of merit, reaching = 0.5 at 800 K.

Composition dependence of the superconducting properties of UTe.

A better understanding of the synthesis conditions, composition and physical properties of UTeare required to interpret previously reported unconventional superconductivity. Here we report how the superconducting properties of single crystals depend on the ratio of elements present in their synthesis by chemical vapour transport. We have obtained crystals with the highest reported ambient pressureand a larger superconducting heat capacity jump from a growth with a U:Te ratio different from that widely used in the literature.