We have investigated the elastoresistance of two FeSe1−xTex (x about 0.4 - 0.5) compounds that have a close chemical composition but differ significantly in electronic properties. The first compound has a negative temperature coefficient of resistance and does not show any phase transitions other than superconducting. The elastoresistance of this compound approximately follows 1/T low as it usually occurs in Fe(Se,S) with metallic conductivity. The second compound has a metallic type of conductivity and in addition to the superconducting transition, there is also a phase transition at a temperature of about 30 K. The elastoresistance of the second compound is sign-reversing and can be approximated with the sum of two Curie-Weiss type terms with opposite signs and different critical temperatures which suggest a competition of contributions to the elastoresistance from different band valleys.
@article{arxiv.2005.11765,
title = {Multiband effect in elastoresistance of Fe(Se,Te)},
author = {Y. A. Ovchenkov and D. A. Chareev and D. E. Presnov and I. G. Puzanova and O. S. Volkova and A. N. Vasiliev},
journal= {arXiv preprint arXiv:2005.11765},
year = {2020}
}