Soft elastic constants from phonon spectroscopy in hole-doped Ba1-x(K,Na)xFe2As2 and Sr1-xNaxFe2As2

Kauth, M.; Rosenkranz, S.; Said, A. H.; Taddei, K. M.; Wolf, Th.; Weber, F.

doi:10.1103/physrevb.102.144526

Title: Soft elastic constants from phonon spectroscopy in hole-doped Ba_1-x(K,Na)_xFe₂As₂ and Sr_1-xNa_xFe₂As₂

Journal Article · Thu Oct 29 00:00:00 EDT 2020 · Physical Review B

DOI:https://doi.org/10.1103/physrevb.102.144526· OSTI ID:1763990

Kauth, M. ^[1];

^[2]; Said, A. H. ^[3];

^[2]; Wolf, Th. ^[1];

^[4]

Karlsruhe Inst. of Technology (KIT) (Germany)
Argonne National Lab. (ANL), Lemont, IL (United States)
Argonne National Lab. (ANL), Lemont, IL (United States). Advanced Photon Source (APS)
Karlsruhe Inst. of Technology (KIT) (Germany); Karlsruhe Inst. of Technology (KIT) (Germany). Inst. for Quantum Materials and Technologies

We report inelastic x-ray scattering measurements of the in-plane polarized transverse acoustic phonon mode propagating along $q ∥ [100]$ in various hole-doped compounds belonging to the 122 family of iron-based superconductors. Additionally, the slope of the dispersion of this phonon mode is proportional to the square root of the shear modulus $C_{66}$ in the $q \to 0$ limit and, hence, sensitive to the tetragonal to orthorhombic structural phase transition occurring in these compounds. In contrast to a recent report for $Ba {({Fe}_{0.94} {Co}_{0.06})}_{2} {As}_{2}$ [Weber et al., Phys. Rev. B 98, 014516 (2018)], we find qualitative agreement between values of $C_{66}$ deduced from our experiments and those derived from measurements of the Young modulus in ${Ba}_{1 - x} {(K, Na)}_{x} {Fe}_{2} {As}_{2}$ at optimal doping. These results provide an upper limit of about 50 Å for the nematic correlation length for the investigated optimally hole-doped compounds. Furthermore, we also studied compounds at lower doping levels exhibiting the orthorhombic magnetic phase, where $C_{66}$ is not accessible by volume probes, as well as the $C_{4}$ tetragonal magnetic 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). Materials Sciences & Engineering Division; Helmholtz Society

Grant/Contract Number:: AC02-06CH11357; VH-NG-840

OSTI ID:: 1763990

Journal Information:: Physical Review B, Vol. 102, Issue 14; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: Soft elastic constants from phonon spectroscopy in hole-doped Ba1-x(K,Na)xFe2As2 and Sr1-xNaxFe2As2

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Title: Soft elastic constants from phonon spectroscopy in hole-doped Ba_1-x(K,Na)_xFe₂As₂ and Sr_1-xNa_xFe₂As₂