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Magnetism in semiconducting molybdenum dichalcogenides

Type of publication Peer-reviewed
Publikationsform Original article (peer-reviewed)
Author Guguchia Z., Kerelsky A., Edelberg D., Banerjee S., von Rohr F., Scullion D., Augustin M., Scully M., Rhodes D. A., Shermadini Z., Luetkens H., Shengelaya A., Baines C., Morenzoni E., Amato A., Hone J. C., Khasanov R., Billinge S. J. L., Santos E., Pasupathy A. N., Uemura Y. J.,
Project Facilitating Access of Georgian Researchers and Students to Novel Materials Synthesis and Large-Scale Facilities at Paul Scherrer Institute
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Original article (peer-reviewed)

Journal Science Advances
Volume (Issue) 4(12)
Page(s) eaat3672 - eaat3672
Title of proceedings Science Advances
DOI 10.1126/sciadv.aat3672

Open Access

URL http://advances.sciencemag.org/content/4/12/eaat3672
Type of Open Access Publisher (Gold Open Access)

Abstract

Transition metal dichalcogenides (TMDs) are interesting for understanding the fundamental physics of two-dimensional (2D) materials as well as for applications to many emerging technologies, including spin electronics. Here, we report the discovery of long-range magnetic order below TM = 40 and 100 K in bulk semiconducting TMDs 2H-MoTe 2 and 2H-MoSe 2 , respectively, by means of muon spin rotation (μSR), scanning tunneling microscopy (STM), and density functional theory (DFT) calculations. The μSR measurements show the presence of large and homogeneous internal magnetic fields at low temperatures in both compounds indicative of long-range magnetic order. DFT calculations show that this magnetism is promoted by the presence of defects in the crystal. The STM measurements show that the vast majority of defects in these materials are metal vacancies and chalcogen-metal antisites, which are randomly distributed in the lattice at the subpercent level. DFT indicates that the antisite defects are magnetic with a magnetic moment in the range of 0.9 to 2.8 μ B . Further, we find that the magnetic order stabilized in 2H-MoTe 2 and 2H-MoSe 2 is highly sensitive to hydrostatic pressure. These observations establish 2H-MoTe 2 and 2H-MoSe 2 as a new class of magnetic semiconductors and open a path to studying the interplay of 2D physics and magnetism in these interesting semiconductors.
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