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Title: Magnetism in semiconducting molybdenum dichalcogenides

Journal Article · · Science Advances
ORCiD logo [1];  [2]; ORCiD logo [2];  [2];  [3]; ORCiD logo [4];  [4];  [4];  [2];  [5];  [5];  [6]; ORCiD logo [5];  [5]; ORCiD logo [5]; ORCiD logo [2]; ORCiD logo [5]; ORCiD logo [7];  [4]; ORCiD logo [2] more »;  [2] « less
  1. Columbia Univ., New York, NY (United States); Paul Scherrer Inst. (PSI), Villigen (Switzerland)
  2. Columbia Univ., New York, NY (United States)
  3. Univ. of Zurich (Switzerland)
  4. Queen's Univ., Belfast, Northern Ireland (United Kingdom)
  5. Paul Scherrer Inst. (PSI), Villigen (Switzerland)
  6. Tbilisi State Univ. (Georgia)
  7. Columbia Univ., New York, NY (United States); Brookhaven National Lab. (BNL), Upton, NY (United States)

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 belowTM = 40 and 100 K in bulk semiconducting TMDs 2H-MoTe2and 2H-MoSe2, 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 μB. Further, we find that the magnetic order stabilized in 2H-MoTe2and 2H-MoSe2is highly sensitive to hydrostatic pressure. These observations establish 2H-MoTe2and 2H-MoSe2as a new class of magnetic semiconductors and open a path to studying the interplay of 2D physics and magnetism in these interesting semiconductors.

Research Organization:
Brookhaven National Lab. (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); Swiss National Science Foundation (SNSF); National Science Foundation (NSF); US Department of the Navy, Office of Naval Research (ONR); US Air Force Office of Scientific Research (AFOSR); SCOPES; Engineering and Physical Sciences Resource Council (EPSRC); Queen’s Univ. Belfast; Northern Ireland Department for the Economy
Grant/Contract Number:
SC0012704; SC00112704; P2ZHP2-161980; P300P2-177832; PZ00P2-174015; DMR-1610110; DMR-1436095; DMR-1610633; DMR-1420634; TG-DMR120049; TG-DMR150017; N00014-14-1-0501; FA9550-11-1-0010; IZ74Z0-160484; EP/K013564/1; EP/P020194/1; M8407MPH; A5047TSL; USI-097
OSTI ID:
1625993
Journal Information:
Science Advances, Vol. 4, Issue 12; ISSN 2375-2548
Publisher:
AAASCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 71 works
Citation information provided by
Web of Science

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Cited By (8)

Atomistic T -matrix theory of disordered two-dimensional materials: Bound states, spectral properties, quasiparticle scattering, and transport journal January 2020
Hidden spin-polarized bands in semiconducting 2H-MoTe 2 journal December 2019
DFT study of itinerant ferromagnetism in p -doped monolayers of MoS 2 journal December 2019
Defect induced, layer-modulated magnetism in ultrathin metallic PtSe2 journal June 2019
Probing and controlling magnetic states in 2D layered magnetic materials journal September 2019
Disorder in van der Waals heterostructures of 2D materials journal May 2019
Experimental study of the diamagnetism and the ferromagnetism in MoS2 thin films journal January 2020
Room‐Temperature Ferromagnetism in MoTe 2 by Post‐Growth Incorporation of Vanadium Impurities journal March 2019