Two-dimensional ordering and collective magnetic excitations in the dilute ferromagnetic topological insulator (Bi0.95Mn0.05)2Te3

Vaknin, David; Pajerowski, Daniel M.; Schlagel, Deborah L.; Dennis, Kevin W.; McQueeney, Robert J.

doi:10.1103/PhysRevB.99.220404

Two-dimensional ordering and collective magnetic excitations in the dilute ferromagnetic topological insulator ${({Bi}_{0.95} {Mn}_{0.05})}_{2} {Te}_{3}$

Journal Article · Sat Jun 01 00:00:00 EDT 2019 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.99.220404· OSTI ID:1545207

Vaknin, David ^[1]; ^[2]; Schlagel, Deborah L. ^[3]; Dennis, Kevin W. ^[3]; McQueeney, Robert J. ^[1]

Ames Lab., Ames, IA (United States); Iowa State Univ., Ames, IA (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Ames Lab., Ames, IA (United States)

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.

View Accepted Manuscript (DOE)

Research Organization:: Ames Laboratory (AMES), Ames, IA (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC02-07CH11358; AC05-00OR22725

OSTI ID:: 1545207

Alternate ID(s):: OSTI ID: 1545359
OSTI ID: 1546244

Report Number(s):: IS-J--9906; IS-J--9978

Journal Information:: Physical Review B, Journal Name: Physical Review B Journal Issue: 22 Vol. 99; ISSN 2469-9950; ISSN PRBMDO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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