Observation of the magnetic C4 phase in Ca1-xNaxFe2As2 and its universality in the hole-doped 122 superconductors

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.

doi:10.1103/PhysRevB.95.064508

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

Journal Article · Wed Feb 15 00:00:00 EST 2017 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.95.064508· OSTI ID:1352516

Taddei, K. M. ^[1]; Allred, J. M. ^[2]; Bugaris, D. E. ^[2]; Lapidus, S. H. ^[2]; Krogstad, M. J. ^[3]; Claus, H. ^[2]; Chung, D. Y. ^[2]; Kanatzidis, M. G. ^[4]; Osborn, R. ^[2]; Rosenkranz, S. ^[2]; Chmaissem, O. ^[3]

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)
Argonne National Lab. (ANL), Argonne, IL (United States)
Northern Illinois Univ., DeKalb, IL (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
Argonne National Lab. (ANL), Argonne, IL (United States); Northwestern Univ., Evanston, IL (United States)

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 Ca_1-xNa_xFe₂As₂(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 T_r = 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 Ba_1-xK_xFe₂As₂. A phase diagram is presented for Ca_1-xNa_xFe₂As₂ and compared to the other Na-doped 122's—A_1-xNa_xFe₂As₂ 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.

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Research Organization:: Argonne National Lab. (ANL), Argonne, IL (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division; Materials Sciences and Engineering Division

Grant/Contract Number:: AC02-06CH11357; AC05-00OR22725

OSTI ID:: 1352516

Alternate ID(s):: OSTI ID: 1344007; OSTI ID: 1376534

Journal Information:: Physical Review B, Vol. 95, Issue 6; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 21 works

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Single-crystal growth of the iron-based superconductor La _0.34 Na _0.66 Fe ₂ As ₂ Gu, Yanhong; Wang, Jia-Ou; Ma, Xiaoyan Superconductor Science and Technology, Vol. 31, Issue 12 https://doi.org/10.1088/1361-6668/aae42d	journal	October 2018
Optical and photoemission investigation of structural and magnetic transitions in the iron-based superconductor ${Sr}_{0.67} {Na}_{0.33} {Fe}_{2} {As}_{2}$ Yang, R.; Huang, J. W.; Zaki, N. Physical Review B, Vol. 100, Issue 23 https://doi.org/10.1103/physrevb.100.235132	journal	December 2019
Preferred Magnetic Excitations in the Iron-Based ${Sr}_{1 - x} {Na}_{x} {Fe}_{2} {As}_{2}$ Superconductor Guo, Jianqing; Yue, Li; Iida, Kazuki Physical Review Letters, Vol. 122, Issue 1 https://doi.org/10.1103/physrevlett.122.017001	journal	January 2019

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