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Title: Hopping conduction in p-type MoS{sub 2} near the critical regime of the metal-insulator transition

We report on temperature-dependent charge and magneto transport of chemically doped MoS{sub 2}, p-type molybdenum disulfide degenerately doped with niobium (MoS{sub 2}:Nb). The temperature dependence of the electrical resistivity is characterized by a power law, ρ(T) ∼ T{sup −0.25}, which indicates that the system resides within the critical regime of the metal-insulator (M-I) transition. By applying high magnetic field (∼7 T), we observed a 20% increase in the resistivity at 2 K. The positive magnetoresistance shows that charge transport in this system is governed by the Mott-like three-dimensional variable range hopping (VRH) at low temperatures. According to relationship between magnetic-field and temperature dependencies of VRH resistivity, we extracted a characteristic localization length of 19.8 nm for MoS{sub 2}:Nb on the insulating side of the M-I transition.
Authors:
;  [1] ; ;  [2] ;  [1] ;  [3] ;  [4] ;  [5] ;  [6] ;  [7] ;  [1] ;  [3]
  1. Center for Spintronics, Korea Institute of Science and Technology, Seoul 136-791 (Korea, Republic of)
  2. Department of Materials Science and Engineering, University of California, Berkeley, California 94720 (United States)
  3. (Korea, Republic of)
  4. Department of Materials Science and Engineering, Stanford University, Stanford, California 94305 (United States)
  5. Department of Electronics Engineering, National Changhua University of Education, Changhua 50007, Taiwan (China)
  6. Department of Electronics Engineering, National Taiwan University of Science and Technology, Taipei 10607, Taiwan (China)
  7. Department of Materials Science and Engineering, Yonsei University, Seoul 120-749 (Korea, Republic of)
Publication Date:
OSTI Identifier:
22486167
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 107; Journal Issue: 22; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; CHARGE TRANSPORT; DOPED MATERIALS; MAGNETIC FIELDS; MAGNETORESISTANCE; MOLYBDENUM SULFIDES; NIOBIUM; PETROLEUM RESIDUES; PHASE TRANSFORMATIONS; TEMPERATURE DEPENDENCE; THREE-DIMENSIONAL LATTICES