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Structural and magnetic phase transitions in Ca 0.73 Le 0.27 FeAs 2 with electron-overdoped FeAs layers

DOI: 10.1103/PhysRevB.93.054522 DOI Help

Authors: Shan Jiang (University of California) , Chang Liu (South University of Science and Technology of China) , Huibo Cao (Oak Ridge National Laboratory) , Turan Birol (Rutgers University) , Jared M. Allred (Argonne National Laboratory) , Wei Tian (Oak Ridge National Laboratory) , Lian Liu (Columbia University) , Kyuil Cho (Iowa State University) , Matthew J. Krogstad (Argonne National Laboratory) , Jie Ma (Oak Ridge National Laboratory) , Keith M. Taddei (Argonne National Laboratory) , Makariy A. Tanatar (Iowa State University) , Moritz Hoesch (Diamond Light Source) , Ruslan Prozorov (Iowa State University) , Stephan Rosenkranz (Argonne National Laboratory) , Yasutomo J. Uemura (Columbia University) , Gabriel Kotliar (Rutgers University) , Ni Ni (University of California)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physical Review B , VOL 93 , PAGES 054522

State: Published (Approved)
Published: January 2016
Diamond Proposal Number(s): 10156

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.

Subject Areas: Physics, Materials

Instruments: I05-ARPES

Added On: 01/03/2016 03:15

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