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Title: Multiple magnetic orders in LaFeAs1-xPxO uncover universality of iron-pnictide superconductors

Journal Article · · Communications Physics
ORCiD logo [1];  [2]; ORCiD logo [3]; ORCiD logo [3];  [4];  [5]; ORCiD logo [5];  [6]; ORCiD logo [6]; ORCiD logo [6]; ORCiD logo [6]; ORCiD logo [7]
  1. University of Maryland, College Park, MD (United States); Argonne National Laboratory (ANL), Lemont, IL (United States); Northern Illinois University, DeKalb, IL (United States)
  2. Science and Technology Facilities Council (STFC), Oxford (United Kingdom). Rutherford Appleton Laboratory, ISIS Neutron Source
  3. Science and Technology Facilities Council (STFC), Oxford (United Kingdom). Rutherford Appleton Laboratory, ISIS Neutron Sourc
  4. Argonne National Laboratory (ANL), Lemont, IL (United States). Advanced Photon Source (APS)
  5. University of Minnesota, Minneapolis, MN (United States)
  6. Argonne National Laboratory (ANL), Lemont, IL (United States)
  7. Argonne National Laboratory (ANL), Lemont, IL (United States); Northern Illinois University, DeKalb, IL (United States)

The iron-pnictide superconductors have generated tremendous excitement as the competition between magnetism and superconductivity has allowed unique in-roads towards elucidating a microscopic theory of unconventional high-temperature superconductivity. In addition to the stripe spin density wave ($$C^a_{2M}$$) phase observed in the parent compounds of all iron-pnictide superconductors, two novel magnetic orders have recently been discovered in different parent structures: an out-of-plane collinear double-Q ($$C^c_{4M}$$) structure in the hole-doped (Ca, Sr, Ba)1-x(Na)xFe2As2 and Ba1-xKxFe2As2 families, and a spin vortex crystal “hedgehog” ($$C^{ab}_{4M}$$) structure in the CaKFe4As4 family. Using neutron diffraction, we demonstrate that LaFeAs1-xPxO contains all three magnetic orders within a single-phase diagram as a function of substitution, all of which compete strongly with superconductivity. Our experimental observations combined with theoretical modeling demonstrate how the reduction in electronic correlations by chemical substitution results in larger Fermi surfaces and the sequential stabilization of multiple magnetic anisotropies. Our work presents a unified narrative for the competing magnetic and superconducting phases observed in various iron-pnictide systems with different crystal structures and chemistry.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States); Univ. of Minnesota, Minneapolis, MN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-06CH11357; SC0020045
OSTI ID:
1906390
Alternate ID(s):
OSTI ID: 1961324
Journal Information:
Communications Physics, Vol. 5, Issue 1; ISSN 2399-3650
Publisher:
Springer NatureCopyright Statement
Country of Publication:
United States
Language:
English

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