Physics and Astronomy, Ames Laboratory
Journal or Book Title
Physical Review B
The study of the iron-based superconductor FeSe has blossomed with the availability of high-quality single crystals, obtained through flux/vapor-transport growth techniques below the structural transformation temperature of its tetragonal phase, T≈450∘C. Here, we report on the variation of sample morphology and properties due to small modifications in the growth conditions. A considerable variation of the superconducting transition temperature Tc, from 8.8 K to 3 K, which cannot be correlated with the sample composition, is observed. Instead, we point out a clear correlation between Tc and disorder, as measured by the residual resistivity ratio. Notably, the tetragonal-to-orthorhombic structural transition is also found to be quite strongly disorder dependent (Ts≈72–90K) and linearly correlated with Tc.
American Physical Society
Böhmer, Anna E.; Taufour, Valentin; Straszheim, Warren E.; Wolf, T.; and Canfield, Paul C., "Variation of transition temperatures and residual resistivity ratio in vapor-grown FeSe" (2016). Physics and Astronomy Publications. 571.