Physics and Astronomy, Ames Laboratory
Journal or Book Title
Physical Review Letters
We study the effect of applied strain as a physical control parameter for the phase transitions of Ca(Fe1−xCox)2As2 using resistivity, magnetization, x-ray diffraction, and 57Fe Mössbauer spectroscopy. Biaxial strain, namely, compression of the basal plane of the tetragonal unit cell, is created through firm bonding of samples to a rigid substrate via differential thermal expansion. This strain is shown to induce a magnetostructural phase transition in originally paramagnetic samples, and superconductivity in previously nonsuperconducting ones. The magnetostructural transition is gradual as a consequence of using strain instead of pressure or stress as a tuning parameter.
American Physical Society
Böhmer, Anna E.; Sapkota, A.; Kreyssig, Andreas; Bud’ko, Sergey L.; Drachuck, G.; Saunders, S. M.; Goldman, Alan I.; and Canfield, Paul C., "Effect of Biaxial Strain on the Phase Transitions of Ca(Fe1−xCox)2As2" (2017). Physics and Astronomy Publications. 541.