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Title: The structural and magnetic phase transitions in Ca0.73La0.27FeAs2 with electron overdoped FeAs layers.

Journal Article · · Physical Review, B: Condensed Matter
 [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.
+ Show Author Affiliations

Here 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). 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.

Research Organization:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); National Science Foundation (NSF)
Grant/Contract Number:
AC02-06CH11357; SC0011978; AC02-07CH11358
OSTI ID:
1245443
Journal Information:
Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 5 Vol. 93; ISSN 0163-1829
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

References (32)

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Superconductivity in Ca 1- x La x FeAs 2 : A Novel 112-Type Iron Pnictide with Arsenic Zigzag Bonds journal December 2013
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Cited By (9)

Persistent antiferromagnetic order in heavily overdoped Ca 1− x La x FeAs 2 journal September 2019
Correlated materials design: prospects and challenges journal December 2018
Reemergence of superconductivity by 4 d transition-metal Pd doping in over-doped 112-type iron pnictide superconductors Ca 0.755 La 0.245 FeAs 2 journal September 2019
Fluctuation conductivity and possible pseudogap state in FeAs-based superconductor EuFeAsO 0.85 F 0.15 journal July 2016
Neutron Spin Resonance in the 112-Type Iron-Based Superconductor journal March 2018
Fluctuation conductivity and possible pseudogap state in FeAs-based superconductor EuFeAsO(0.85)F(0.15) text January 2015
Neutron spin resonance in the 112-type iron-based superconductor text January 2018
Correlated materials design: prospects and challenges text January 2018
Persistent antiferromagnetic order in heavily overdoped Ca$_{1-x}$La$_x$FeAs$_2$ text January 2019

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