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Instruments / Technical Area	Publication Details	Published	Actions
I05-ARPES	Structural and magnetic phase transitions in Ca0.73La0.27FeAs2 with electron-overdoped FeAs layers Shan Jiang , Chang Liu , Huibo Cao , Turan Birol , Jared M. Allred , Wei Tian , Lian Liu , Kyuil Cho , Matthew J. Krogstad , Jie Ma , Keith M. Taddei , Makariy A. Tanatar , Moritz Hoesch , Ruslan Prozorov , Stephan Rosenkranz , Yasutomo J. Uemura , Gabriel Kotliar , Ni Ni Physical Review B 93, 054522 DOI: 10.1103/PhysRevB.93.054522 Diamond Proposal Number(s): [10156] Show Abstract ▼ Abstract: We report a study of the Ca0.73La0.27 FeAs2 single crystals. We unravel a monoclinic to triclinic phase transition at 58 K, and a paramagnetic to stripe antiferromagnetic phase transition at 54 K, below which spins order 45 deg 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). Finally, in addition to the central-hole and corner-electron Fermi pockets usually appearing in Fe pnictide superconductors, angle-resolved photoemission measurements resolve a fermiology where an extra electron pocket of mainly As chain character exists at the Brillouin zone edge.	Jan 2016

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