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Title: The structural and magnetic phase transitions in Ca 0.73La 0.27FeAs 2 with electron overdoped FeAs layers.

Here we report a study of the Ca 0.73La 0.27FeAs 2 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). Finally, 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.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [3] ;  [6] ;  [7] ;  [8] ;  [3] ;  [8] ;  [7] ;  [9] ;  [7] ;  [5] ;  [6] ;  [4] ;  [1]
  1. Univ. of California, Los Angeles, CA (United States). Dept. of Physics and Astronomy and California NanoSystems Inst.
  2. South Univ. of Science and Technology of China, Shenzhen (China). Dept. of Physics
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Quantum Condensed Matter Division
  4. Rutgers Univ., Piscataway, NJ (United States). Dept. of Physics and Astronomy
  5. Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Division
  6. Columbia Univ., New York, NY (United States). Dept. of Physics
  7. Ames Lab. and Iowa State Univ., Ames, IA (United States). Dept. of Physics and Astronomy
  8. Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Division; Northern Illinois Univ., DeKalb, IL (United States). Dept. of Physics
  9. Science and Technology Facilities Council (STFC), Harwell Campus, Oxford (United Kingdom). Diamond Light Source, Ltd.
Publication Date:
Report Number(s):
IS-J-8965
Journal ID: ISSN 0163-1829; 124440
Grant/Contract Number:
AC02-06CH11357; SC0011978; AC02-07CH11358; DMR-1436095; DMR-1435918; DMR-1105961
Type:
Accepted Manuscript
Journal Name:
Physical Review, B: Condensed Matter
Additional Journal Information:
Journal Volume: 93; Journal Issue: 5; Journal ID: ISSN 0163-1829
Publisher:
American Physical Society (APS)
Research Org:
Argonne National Lab. (ANL), Argonne, IL (United States); Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); National Science Foundation (NSF)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 36 MATERIALS SCIENCE; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; single crystals
OSTI Identifier:
1245443
Alternate Identifier(s):
OSTI ID: 1239614; OSTI ID: 1249346