Challenges to magnetic doping of thin films of the Dirac semimetal Cd3As2

Xiao, Run; Held, Jacob T.; Rable, Jeffrey; Ghosh, Supriya; Wang, Ke; Mkhoyan, K. Andre; Samarth, Nitin

doi:10.1103/physrevmaterials.6.024203

Challenges to magnetic doping of thin films of the Dirac semimetal Cd3 As2

Journal Article · Mon Feb 21 23:00:00 EST 2022 · Physical Review Materials

DOI:https://doi.org/10.1103/physrevmaterials.6.024203· OSTI ID:1980341

^[1]; ^[2]; Rable, Jeffrey ^[3]; Ghosh, Supriya ^[2]; Wang, Ke ^[3]; ^[2]; ^[3]

Pennsylvania State Univ., University Park, PA (United States); OSTI
Univ. of Minnesota, Minneapolis, MN (United States)
Pennsylvania State Univ., University Park, PA (United States)

Magnetic doping of topological quantum materials provides an attractive route for studying the effects of time-reversal symmetry breaking. Thus motivated, we explore the introduction of the transition metal Mn into thin films of the Dirac semimetal Cd₃A_s2 during growth by molecular beam epitaxy. Scanning transmission electron microscopy measurements show the formation of a Mn-rich phase at the top surface of Mn-doped Cd₃A_s2 thin films grown using both uniform doping and delta doping. This suggests that Mn acts as a surfactant during epitaxial growth of Cd₃A_s2, resulting in phase separation. Magnetometry measurements of such samples indicate a ferromagnetic phase with out-of-plane magnetic anisotropy. Electrical magneto-transport measurements of these films as a function of temperature, magnetic field, and chemical potential reveal a lower carrier density and higher electron mobility compared with pristine Cd₃A_s2 films grown under similar conditions. This suggests that the surfactant effect might also serve to remove impurities from the bulk of the film. Further, we observe robust quantum transport (Shubnikov-de Haas oscillations and an incipient integer quantum Hall effect) in very thin (7 nm) Cd₃A_s2 films despite being in direct contact with a structurally disordered surface ferromagnetic overlayer.

View Accepted Manuscript (DOE)

Research Organization:: Johns Hopkins Univ., Baltimore, MD (United States); Energy Frontier Research Centers (EFRC) (United States). Institute for Quantum Matter (IQM)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)

Grant/Contract Number:: SC0019331

OSTI ID:: 1980341

Journal Information:: Physical Review Materials, Journal Name: Physical Review Materials Journal Issue: 2 Vol. 6; ISSN 2475-9953

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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