Detailed magnetic and structural analysis mapping a robust magnetic C4 dome in Sr1-xNaxFe2As2

Taddei, K. M.; Allred, J. M.; Bugaris, D. E.; Lapidus, S.; Krogstad, M. J.; Stadel, R.; Claus, H.; Chung, D. Y.; Kanatzidis, M. G.; Rosenkranz, S.; Osborn, R.; Chmaissem, O.

doi:10.1103/PhysRevB.93.134510

Title: Detailed magnetic and structural analysis mapping a robust magnetic $C_{4}$ dome in ${Sr}_{1 - x} {Na}_{x} {Fe}_{2} {As}_{2}$

Journal Article · Wed Apr 20 00:00:00 EDT 2016 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.93.134510· OSTI ID:1352600

Taddei, K. M. ^[1]; Allred, J. M. ^[2]; Bugaris, D. E. ^[3]; Lapidus, S. ^[4]; Krogstad, M. J. ^[1]; Stadel, R. ^[1]; Claus, H. ^[3]; Chung, D. Y. ^[3]; Kanatzidis, M. G. ^[5]; Rosenkranz, S. ^[3]; Osborn, R. ^[3]; Chmaissem, O. ^[1]

Northern Illinois Univ., DeKalb, IL (United States). Dept. of Physics; Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Division
Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Division; Univ. of Alabama, Tuscaloosa, AL (United States). Dept. of Chemistry
Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Division
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Division; Northwestern Univ., Evanston, IL (United States). Dept. of Chemistry

The recently discovered C₄ tetragonal magnetic phase in hole-doped members of the iron-based superconductors provides new insights into the origin of unconventional superconductivity. Previously observed in Ba_1-xNa_xFe₂As₂ (with A = K, Na), the C₄ magnetic phase exists within the well studied C₂ spin-density wave (SDW) dome, arising just before the complete suppression of antiferromagnetic (AFM) order but after the onset of superconductivity. Here in this paper, we present detailed x-ray and neutron diffraction studies of Sr_1-xNa_xFe₂As₂ (0.10 ≤ x ≤ 0.60) to determine their structural evolution and the extent of the C₄ phase. Spanning Δx ~ 0.14 in composition, the C₄ phase is found to extend over a larger range of compositions, and to exhibit a significantly higher transition temperature, T_r ~ 65K, than in either of the other systems in which it has been observed. The onset of this phase is seen near a composition (x~0:30) where the bonding angles of the Fe₂As₂ layers approach the perfect 109.46° tetrahedral angle. We discuss the possible role of this return to a higher symmetry environment for the magnetic iron site in triggering the magnetic reorientation and the coupled re-entrance to the tetragonal structure. Finally, we present a new phase diagram, complete with the C₄ phase, and use its observation in a third hole-doped 122 system to suggest the universality of this phase.

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Research Organization:: Argonne National Lab. (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1352600

Alternate ID(s):: OSTI ID: 1248253

Journal Information:: Physical Review B, Vol. 93, Issue 13; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 31 works

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Strong spin resonance mode associated with suppression of soft magnetic ordering in hole-doped Ba1-xNaxFe2As2 Waßer, Florian; Park, Jitae T.; Aswartham, Saicharan npj Quantum Materials, Vol. 4, Issue 1 https://doi.org/10.1038/s41535-019-0198-4	journal	December 2019
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
Strong Spin Resonance Mode associated with suppression of soft magnetic ordering in Hole-doped Ba1-xNaxFe2As2 Wasser, F.; Park, J. -T.; Aswartham, S. arXiv https://doi.org/10.48550/arxiv.1909.03046	text	January 2019

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