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Title: Intertwined Magnetic and Nematic Orders in Semiconducting KFe 0.8 Ag 1.2 Te 2

Abstract

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 KFe0.8Ag1.2Te2 (K5Fe4Ag6Te10) without itinerant electrons. We find that Fe atoms in KFe0.8Ag1.2Te2 form isolated 2×2 blocks, separated by nonmagnetic Ag atoms. Long-range magnetic order sets in below TN≈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 KFe0.8Ag1.2Te2 and iron pnictide parent compounds are similar in magnitude and in how they relate to the magnetic order, indicating a common origin. Since KFe0.8Ag1.2Te2 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.

Authors:
 [1];  [2];  [2];  [3];  [4];  [4];  [4];  [1]
  1. Univ. of California, Berkeley, CA (United States). Dept. of Physics; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Materials Sciences Division
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Neutron Scattering Division
  3. National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States). Center for Neutron Research
  4. Brookhaven National Lab. (BNL), Upton, NY (United States). Condensed Matter Physics and Materials Science Dept.
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1504375
Alternate Identifier(s):
OSTI ID: 1546391; OSTI ID: 1559624; OSTI ID: 1571977
Report Number(s):
BNL-211490-2019-JAAM
Journal ID: ISSN 0031-9007; PRLTAO
Grant/Contract Number:  
SC0012704; AC02-05CH11231; KC0402010; AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 122; Journal Issue: 8; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Song, Yu, Cao, Huibo, Chakoumakos, B. C., Zhao, Yang, Wang, Aifeng, Lei, Hechang, Petrovic, C., and Birgeneau, Robert J. Intertwined Magnetic and Nematic Orders in Semiconducting KFe0.8Ag1.2Te2. United States: N. p., 2019. Web. doi:10.1103/PhysRevLett.122.087201.
Song, Yu, Cao, Huibo, Chakoumakos, B. C., Zhao, Yang, Wang, Aifeng, Lei, Hechang, Petrovic, C., & Birgeneau, Robert J. Intertwined Magnetic and Nematic Orders in Semiconducting KFe0.8Ag1.2Te2. United States. doi:10.1103/PhysRevLett.122.087201.
Song, Yu, Cao, Huibo, Chakoumakos, B. C., Zhao, Yang, Wang, Aifeng, Lei, Hechang, Petrovic, C., and Birgeneau, Robert J. Mon . "Intertwined Magnetic and Nematic Orders in Semiconducting KFe0.8Ag1.2Te2". United States. doi:10.1103/PhysRevLett.122.087201. https://www.osti.gov/servlets/purl/1504375.
@article{osti_1504375,
title = {Intertwined Magnetic and Nematic Orders in Semiconducting KFe0.8Ag1.2Te2},
author = {Song, Yu and Cao, Huibo and Chakoumakos, B. C. and Zhao, Yang and Wang, Aifeng and Lei, Hechang and Petrovic, C. and Birgeneau, Robert J.},
abstractNote = {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 KFe0.8Ag1.2Te2 (K5Fe4Ag6Te10) without itinerant electrons. We find that Fe atoms in KFe0.8Ag1.2Te2 form isolated 2×2 blocks, separated by nonmagnetic Ag atoms. Long-range magnetic order sets in below TN≈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 KFe0.8Ag1.2Te2 and iron pnictide parent compounds are similar in magnitude and in how they relate to the magnetic order, indicating a common origin. Since KFe0.8Ag1.2Te2 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.},
doi = {10.1103/PhysRevLett.122.087201},
journal = {Physical Review Letters},
number = 8,
volume = 122,
place = {United States},
year = {2019},
month = {2}
}

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