Tetragonal-orthorhombic phase coexistence under magnetic fields in BaFe${}_2$As${}_2$ and Sr(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$: evidence of magnetically driven structural transition

U. F. Kaneko, C. B. R. Jesus, M. E. Saleta +3

Synchrotron x-ray diffraction experiments were performed on BaFe${}_2$As${}_2$ and Sr(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$ single crystals as a function of temperature and applied magnetic fi…