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Title: Two-dimensional ordering and collective magnetic excitations in the dilute ferromagnetic topological insulator ( Bi 0.95 Mn 0.05 ) 2 Te 3

Abstract

Employing elastic and inelastic neutron scattering (INS) techniques, we introduce the microscopic properties of the ferromagnetism in the dilute magnetic topological insulator ( Bi 0.95 Mn 0.05 ) 2 Te 3 . Neutron diffraction of polycrystalline samples shows the ferromagnetic (FM) ordering is long range within the basal plane, and mainly two dimensional (2D) in character with short-range correlations between layers below T C ≈ 13 K. Remarkably, we observe gapped and collective magnetic excitations in this dilute magnetic system. The excitations appear typical of quasi-2D FM systems despite the severe broadening of short-wavelength magnons which is expected from the random spatial distribution of Mn atoms in the Bi planes. A detailed investigation of the INS provides the average values for exchange couplings which are consistent with reports of carrier-mediated interactions.

Authors:
 [1]; ORCiD logo [2];  [3];  [3];  [1]
  1. Ames Lab., Ames, IA (United States); Iowa State Univ., Ames, IA (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  3. Ames Lab., Ames, IA (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1545207
Alternate Identifier(s):
OSTI ID: 1545359; OSTI ID: 1546244
Report Number(s):
IS-J-9906; IS-J-9978
Journal ID: ISSN 2469-9950; PRBMDO
Grant/Contract Number:  
AC05-00OR22725; AC02-07CH11358
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 99; Journal Issue: 22; 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

Citation Formats

Vaknin, David, Pajerowski, Daniel M., Schlagel, Deborah L., Dennis, Kevin W., and McQueeney, Robert J. Two-dimensional ordering and collective magnetic excitations in the dilute ferromagnetic topological insulator (Bi0.95Mn0.05)2Te3. United States: N. p., 2019. Web. doi:10.1103/PhysRevB.99.220404.
Vaknin, David, Pajerowski, Daniel M., Schlagel, Deborah L., Dennis, Kevin W., & McQueeney, Robert J. Two-dimensional ordering and collective magnetic excitations in the dilute ferromagnetic topological insulator (Bi0.95Mn0.05)2Te3. United States. doi:10.1103/PhysRevB.99.220404.
Vaknin, David, Pajerowski, Daniel M., Schlagel, Deborah L., Dennis, Kevin W., and McQueeney, Robert J. Sat . "Two-dimensional ordering and collective magnetic excitations in the dilute ferromagnetic topological insulator (Bi0.95Mn0.05)2Te3". United States. doi:10.1103/PhysRevB.99.220404.
@article{osti_1545207,
title = {Two-dimensional ordering and collective magnetic excitations in the dilute ferromagnetic topological insulator (Bi0.95Mn0.05)2Te3},
author = {Vaknin, David and Pajerowski, Daniel M. and Schlagel, Deborah L. and Dennis, Kevin W. and McQueeney, Robert J.},
abstractNote = {Employing elastic and inelastic neutron scattering (INS) techniques, we introduce the microscopic properties of the ferromagnetism in the dilute magnetic topological insulator (Bi0.95Mn0.05)2Te3. Neutron diffraction of polycrystalline samples shows the ferromagnetic (FM) ordering is long range within the basal plane, and mainly two dimensional (2D) in character with short-range correlations between layers below TC ≈ 13 K. Remarkably, we observe gapped and collective magnetic excitations in this dilute magnetic system. The excitations appear typical of quasi-2D FM systems despite the severe broadening of short-wavelength magnons which is expected from the random spatial distribution of Mn atoms in the Bi planes. A detailed investigation of the INS provides the average values for exchange couplings which are consistent with reports of carrier-mediated interactions.},
doi = {10.1103/PhysRevB.99.220404},
journal = {Physical Review B},
number = 22,
volume = 99,
place = {United States},
year = {2019},
month = {6}
}

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