Optical spectroscopy study of the collapsed tetragonal phase of CaFe${}_2$(As${}_{0.935}$P${}_{0.065}$)${}_2$ single crystals

X. B. Wang, H. P. Wang, T. Dong +2

We present an optical spectroscopy study on P-doped CaFe${}_2$As${}_2$ which experiences a structural phase transition from tetragonal to collapsed tetragonal (cT) phase near 75 K. The…