Intertwined Magnetic and Nematic Orders in Semiconducting KFe0.8Ag1.2Te2

Song, Yu; Cao, Huibo; Chakoumakos, B. C.; Zhao, Yang; Wang, Aifeng; Lei, Hechang; Petrovic, C.; Birgeneau, Robert J.

doi:10.1103/PhysRevLett.122.087201

Title: Intertwined Magnetic and Nematic Orders in Semiconducting ${KFe}_{0.8} {Ag}_{1.2} {Te}_{2}$

Journal Article · Mon Feb 25 00:00:00 EST 2019 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.122.087201· OSTI ID:1504375

Song, Yu ^[1]; Cao, Huibo ^[2]; Chakoumakos, B. C. ^[2]; Zhao, Yang ^[3]; Wang, Aifeng ^[4]; Lei, Hechang ^[4]; Petrovic, C. ^[4]; Birgeneau, Robert J. ^[1]

Univ. of California, Berkeley, CA (United States). Dept. of Physics; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Materials Sciences Division
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Neutron Scattering Division
National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States). Center for Neutron Research
Brookhaven National Lab. (BNL), Upton, NY (United States). Condensed Matter Physics and Materials Science Dept.

Superconductivity in the iron pnictides emerges from metallic parent compounds exhibiting intertwined stripe-type magnetic order and nematic order, with itinerant electrons suggested to be essential for both. Here we use x-ray and neutron scattering to show that a similar intertwined state is realized in semiconducting KFe_0.8Ag_1.2Te₂ (K₅Fe₄Ag₆Te₁₀) without itinerant electrons. We find that Fe atoms in KFe_0.8Ag_1.2Te₂ form isolated 2×2 blocks, separated by nonmagnetic Ag atoms. Long-range magnetic order sets in below T_N ≈ 35 K, with magnetic moments within the 2×2 Fe blocks ordering into the stripe-type configuration. A nematic order accompanies the magnetic transition, manifest as a structural distortion that breaks the fourfold rotational symmetry of the lattice. The nematic orders in KFe_0.8Ag_1.2Te₂ and iron pnictide parent compounds are similar in magnitude and in how they relate to the magnetic order, indicating a common origin. Since KFe_0.8Ag_1.2Te₂ is a semiconductor without itinerant electrons, this indicates that local-moment magnetic interactions are integral to its magnetic and nematic orders, and such interactions may play a key role in iron-based superconductivity.

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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

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

Grant/Contract Number:: SC0012704; AC02-05CH11231; KC0402010; AC05-00OR22725

OSTI ID:: 1504375

Alternate ID(s):: OSTI ID: 1546391; OSTI ID: 1559624; OSTI ID: 1571977

Report Number(s):: BNL-211490-2019-JAAM; PRLTAO

Journal Information:: Physical Review Letters, Vol. 122, Issue 8; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 10 works

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Title: Intertwined Magnetic and Nematic Orders in Semiconducting ${KFe}_{0.8} {Ag}_{1.2} {Te}_{2}$