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We report a study of the Ca$_{0.73}$La$_{0.27}$FeAs$_2$ single crystals. Weunravel a monoclinic to triclinic phase transition at 58 K, and a paramagneticto stripe antiferromagnetic (AFM) phase transition at 54 K, below which spinsorder 45$^\circ$ away from the stripe direction. Furthermore, we demonstratethis material is substantially structurally untwinned at ambient pressure withthe formation of spin rotation walls (S-walls). Finally, in addition to thecentral-hole and corner-electron Fermi pockets usually appearing in Fe pnictidesuperconductors, angle-resolved photoemission (ARPES) measurements resolve aFermiology where an extra electron pocket of mainly As chain character existsat the Brillouin zone edge.

Structural and magnetic phase transitions in Ca$_{0.73}$La$_{0.27}$FeAs$_2$ with electron overdoped FeAs layers