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Title: Spin dynamics in antiferromagnetic oxypnictides and fluoropnictides: LaMnAsO, LaMnSbO, and BaMnAsF

Abstract

In this study, inelastic neutron scattering (INS) from polycrystalline antiferromagnetic LaMnAsO, LaMnSbO, and BaMnAsF are analyzed using a J 1 - J 2 - J c Heisenberg model in the framework of the linear spin-wave theory. All three systems show clear evidence that the nearest- and next-nearest-neighbor interactions within the Mn square lattice layer ( J 1 and J 2 ) are both antiferromagnetic (AFM). However, for all compounds studied the competing interactions have a ratio of 2 J 2 / J 1 < 1 , which favors the square lattice checkerboard AFM structure over the stripe AFM structure. The interplane coupling J c in all three systems is on the order of ~ 3 × 10 - 4 J 1 , rendering the magnetic properties of these systems with quasi-two-dimensional character. The substitution of Sb for As significantly lowers the in-plane exchange coupling, which is also reflected in the decrease of the Néel temperature, T N . Although BaMnAsF shares the same MnAs sheets as LaMnAsO, their J 1 and J 2 values are substantially different. Lastly, using density functional theory, we calculate exchange parameters J i j to rationalize the differences among these systems.

Authors:
 [1];  [1];  [1];  [1];  [1]; ORCiD logo [2];  [3]; ORCiD logo [3]
  1. Ames Laboratory (AMES), Ames, IA (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  3. Ames Laboratory (AMES), Ames, IA (United States); Iowa State Univ., Ames, IA (United States)
Publication Date:
Research Org.:
Ames Lab., Ames, IA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division
OSTI Identifier:
1616551
Alternate Identifier(s):
OSTI ID: 1615072
Report Number(s):
IS-J 10,206
Journal ID: ISSN 2469-9950; PRBMDO
Grant/Contract Number:  
AC02-07CH11358
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 101; Journal Issue: 15; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 36 MATERIALS SCIENCE; Spin dynamics; Pnictides; Strongly correlated systems; Inelastic neutron scattering

Citation Formats

Islam, Farhan, Gordon, Elijah, Das, Pinaki, Liu, Yong, Ke, Liqin, Abernathy, Douglas L., McQueeney, Robert J., and Vaknin, David. Spin dynamics in antiferromagnetic oxypnictides and fluoropnictides: LaMnAsO, LaMnSbO, and BaMnAsF. United States: N. p., 2020. Web. doi:10.1103/PhysRevB.101.155119.
Islam, Farhan, Gordon, Elijah, Das, Pinaki, Liu, Yong, Ke, Liqin, Abernathy, Douglas L., McQueeney, Robert J., & Vaknin, David. Spin dynamics in antiferromagnetic oxypnictides and fluoropnictides: LaMnAsO, LaMnSbO, and BaMnAsF. United States. doi:https://doi.org/10.1103/PhysRevB.101.155119
Islam, Farhan, Gordon, Elijah, Das, Pinaki, Liu, Yong, Ke, Liqin, Abernathy, Douglas L., McQueeney, Robert J., and Vaknin, David. Wed . "Spin dynamics in antiferromagnetic oxypnictides and fluoropnictides: LaMnAsO, LaMnSbO, and BaMnAsF". United States. doi:https://doi.org/10.1103/PhysRevB.101.155119. https://www.osti.gov/servlets/purl/1616551.
@article{osti_1616551,
title = {Spin dynamics in antiferromagnetic oxypnictides and fluoropnictides: LaMnAsO, LaMnSbO, and BaMnAsF},
author = {Islam, Farhan and Gordon, Elijah and Das, Pinaki and Liu, Yong and Ke, Liqin and Abernathy, Douglas L. and McQueeney, Robert J. and Vaknin, David},
abstractNote = {In this study, inelastic neutron scattering (INS) from polycrystalline antiferromagnetic LaMnAsO, LaMnSbO, and BaMnAsF are analyzed using a J1-J2-Jc Heisenberg model in the framework of the linear spin-wave theory. All three systems show clear evidence that the nearest- and next-nearest-neighbor interactions within the Mn square lattice layer (J1 and J2) are both antiferromagnetic (AFM). However, for all compounds studied the competing interactions have a ratio of 2J2/J1<1, which favors the square lattice checkerboard AFM structure over the stripe AFM structure. The interplane coupling Jc in all three systems is on the order of ~3×10-4J1, rendering the magnetic properties of these systems with quasi-two-dimensional character. The substitution of Sb for As significantly lowers the in-plane exchange coupling, which is also reflected in the decrease of the Néel temperature, TN. Although BaMnAsF shares the same MnAs sheets as LaMnAsO, their J1 and J2 values are substantially different. Lastly, using density functional theory, we calculate exchange parameters Jij to rationalize the differences among these systems.},
doi = {10.1103/PhysRevB.101.155119},
journal = {Physical Review B},
number = 15,
volume = 101,
place = {United States},
year = {2020},
month = {4}
}

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