Structural and Magnetic Phase Transitions in [math][mrow][msub][mi]Ca[/mi][mrow][mn]0.73[/mn][/mrow][/msub][msub][mi]Le[/mi][mrow][mn]0.27[/mn][/mrow][/msub][msub][mi]FeAs[/mi][mn]2[/mn][/msub][/mrow][/math] with Electron-overdoped FeAs Layers

Download or read book Structural and Magnetic Phase Transitions in [math][mrow][msub][mi]Ca[/mi][mrow][mn]0.73[/mn][/mrow][/msub][msub][mi]Le[/mi][mrow][mn]0.27[/mn][/mrow][/msub][msub][mi]FeAs[/mi][mn]2[/mn][/msub][/mrow][/math] with Electron-overdoped FeAs Layers written by and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We report a study of the Ca0.73La0.27FeAs2 single crystals. We unravel a monoclinic to triclinic phase transition at 58 K, and a paramagnetic to stripe antiferromagnetic (AFM) phase transition at 54 K, below which spins order 45° away from the stripe direction. Furthermore, we demonstrate this material is substantially structurally untwinned at ambient pressure with the formation of spin rotation walls (S-walls). Lastly, in addition to the central-hole and corner-electron Fermi pockets usually appearing in FPS, angle-resolved photoemission (ARPES) measurements resolve a Fermiology where an extra electron pocket of mainly As chain character exists at the Brillouin zone edge.