Effect of biaxial strain on the phase transitions of Ca(Fe1-xCox)2As2
  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 M\"ossbauer 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 magneto-structural phase transition in originally paramagnetic samples; and superconductivity in previously non-superconducting ones. The magneto-structural transition is gradual as a consequence of using strain instead of pressure or stress as a tuning parameter. 
A. E. B\"ohmer, A. Sapkota, A. Kreyssig, S. L. Bud'ko, G. Drachuck, S.   M. Saunders, A. I. Goldman, and P. C. Canfield
cond-mat.supr-con