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Title: Observation of the magnetic C 4 phase in Ca 1 - x Na x Fe 2 As 2 and its universality in the hole-doped 122 superconductors

Abstract

Since its discovery in 2014, the magnetic tetragonal C 4 phase has been identified in a growing number of hole-doped 122 Fe-based superconducting compounds. Exhibiting a unique double-Q magnetic structure and a strong competition with both superconducting and magnetic order parameters, the C 4 phase and the conditions of its formation are of significant interest to understanding the fundamental mechanisms in these materials. Particularly, separating the importance of direct changes to the relative size of hole and electron pockets at the Fermi surface (achieved via charge doping) from the role of structural changes due to differences of ionic radii of dopants is useful to determine the underlying parameter which causes the C 4 instability. Here, we report the discovery of the C 4 phase in a fourth member of the hole-doped 122 materials Ca 1-xNa xFe 2As 2(0.20 ≤ x ≤ 0.50) as determined from neutron and x-ray powder diffraction studies. The maximum of the C 4 dome is observed at x = 0.44 with a reentrant temperature T r = 52 K and an extent of Δx ~ 0.07 in composition. It is observed that for a range of compositions within the C 4 dome (0.40 ≤ x ≤more » 0.42), there is a second reentrance (Tr 2 < Tr) where the antiferromagnetic C 2 phase is recovered—a feature previously only seen in Ba 1-xK xFe 2As 2. A phase diagram is presented for Ca 1-xNa xFe 2As 2 and compared to the other Na-doped 122's—A 1-xNa xFe 2As 2 with A = Ba, Sr, and Ca. Lastly, the structural parameters for these three systems are compared and the importance of the “chemical pressure” due to changing the A-site ion (A = Ba, Sr, Ca) is discussed.« less

Authors:
 [1];  [2];  [2];  [2];  [3];  [2];  [2];  [4];  [2];  [2];  [3]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Northern Illinois Univ., DeKalb, IL (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
  2. Argonne National Lab. (ANL), Argonne, IL (United States)
  3. Northern Illinois Univ., DeKalb, IL (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
  4. Argonne National Lab. (ANL), Argonne, IL (United States); Northwestern Univ., Evanston, IL (United States)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Scientific User Facilities Division; Materials Sciences and Engineering Division
OSTI Identifier:
1352516
Alternate Identifier(s):
OSTI ID: 1344007; OSTI ID: 1376534
Grant/Contract Number:  
AC02-06CH11357; AC05-00OR22725
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 95; Journal Issue: 6; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Taddei, K. M., Allred, J. M., Bugaris, D. E., Lapidus, S. H., Krogstad, M. J., Claus, H., Chung, D. Y., Kanatzidis, M. G., Osborn, R., Rosenkranz, S., and Chmaissem, O. Observation of the magnetic C4 phase in Ca1-xNaxFe2As2 and its universality in the hole-doped 122 superconductors. United States: N. p., 2017. Web. doi:10.1103/PhysRevB.95.064508.
Taddei, K. M., Allred, J. M., Bugaris, D. E., Lapidus, S. H., Krogstad, M. J., Claus, H., Chung, D. Y., Kanatzidis, M. G., Osborn, R., Rosenkranz, S., & Chmaissem, O. Observation of the magnetic C4 phase in Ca1-xNaxFe2As2 and its universality in the hole-doped 122 superconductors. United States. doi:10.1103/PhysRevB.95.064508.
Taddei, K. M., Allred, J. M., Bugaris, D. E., Lapidus, S. H., Krogstad, M. J., Claus, H., Chung, D. Y., Kanatzidis, M. G., Osborn, R., Rosenkranz, S., and Chmaissem, O. Wed . "Observation of the magnetic C4 phase in Ca1-xNaxFe2As2 and its universality in the hole-doped 122 superconductors". United States. doi:10.1103/PhysRevB.95.064508. https://www.osti.gov/servlets/purl/1352516.
@article{osti_1352516,
title = {Observation of the magnetic C4 phase in Ca1-xNaxFe2As2 and its universality in the hole-doped 122 superconductors},
author = {Taddei, K. M. and Allred, J. M. and Bugaris, D. E. and Lapidus, S. H. and Krogstad, M. J. and Claus, H. and Chung, D. Y. and Kanatzidis, M. G. and Osborn, R. and Rosenkranz, S. and Chmaissem, O.},
abstractNote = {Since its discovery in 2014, the magnetic tetragonal C4 phase has been identified in a growing number of hole-doped 122 Fe-based superconducting compounds. Exhibiting a unique double-Q magnetic structure and a strong competition with both superconducting and magnetic order parameters, the C4 phase and the conditions of its formation are of significant interest to understanding the fundamental mechanisms in these materials. Particularly, separating the importance of direct changes to the relative size of hole and electron pockets at the Fermi surface (achieved via charge doping) from the role of structural changes due to differences of ionic radii of dopants is useful to determine the underlying parameter which causes the C4 instability. Here, we report the discovery of the C4 phase in a fourth member of the hole-doped 122 materials Ca1-xNaxFe2As2(0.20 ≤ x ≤ 0.50) as determined from neutron and x-ray powder diffraction studies. The maximum of the C4 dome is observed at x = 0.44 with a reentrant temperature Tr = 52 K and an extent of Δx ~ 0.07 in composition. It is observed that for a range of compositions within the C4 dome (0.40 ≤ x ≤ 0.42), there is a second reentrance (Tr2 < Tr) where the antiferromagnetic C2 phase is recovered—a feature previously only seen in Ba1-xKxFe2As2. A phase diagram is presented for Ca1-xNaxFe2As2 and compared to the other Na-doped 122's—A1-xNaxFe2As2 with A = Ba, Sr, and Ca. Lastly, the structural parameters for these three systems are compared and the importance of the “chemical pressure” due to changing the A-site ion (A = Ba, Sr, Ca) is discussed.},
doi = {10.1103/PhysRevB.95.064508},
journal = {Physical Review B},
number = 6,
volume = 95,
place = {United States},
year = {Wed Feb 15 00:00:00 EST 2017},
month = {Wed Feb 15 00:00:00 EST 2017}
}

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Works referenced in this record:

Revised effective ionic radii and systematic studies of interatomic distances in halides and chalcogenides
journal, September 1976