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Title: Structural and magnetic phase transitions in Ca0.73Le0.27FeAs2 with electron-overdoped FeAs layers

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.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [3] ;  [6] ;  [7] ;  [8] ;  [3] ;  [8] ;  [7] ;  [9] ;  [7] ;  [5] ;  [6] ;  [10] ;  [1]
  1. Univ. of California, Los Angeles, CA (United States). Department of Physics and Astronomy
  2. South Univ. of Science and Technology of China, Guangdong (China). Department of Physics
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Quantum Condensed Matter Division
  4. Rutgers Univ., Piscataway, NJ (United States). Department 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. Harwell Campus, Oxford (United Kingdom). Diamond Light Source, Ltd.
  10. Rutgers Univ., Piscataway, NJ (United States). Dept. of Physics and Astronomy
Publication Date:
OSTI Identifier:
1249346
Report Number(s):
IS-J--8965
Journal ID: ISSN 2469-9950; PRBMDO
Grant/Contract Number:
SC0011978; AC02-07CH11358; DMR-1436095; DMR-1105961; DMR-1435918
Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 93; Journal Issue: 5; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Research Org:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS single crystals