Induced ferromagnetism and metal-insulator transition due to a charge transfer effect in silver nanoparticle decorated MoS2

MoS2 sheets are decorated by silver nanoparticles of size 10–12 nm. Localized holes are generated in Ag 4d levels carrying a magnetic moment due to the charge transfer effect at the interface and formation of Ag-S bonds. Temperature-dependent charge transport shows a metal-insulator (M-I) transition...

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Bibliographic Details
Published in:Physical review. B 2018-07, Vol.98 (1)
Main Authors: Bag, Shekhar, Bhattacharya, Shatabda, Dinda, Diptiman, Jyothirmai, M V, Thapa, Ranjit, Saha, Shyamal K
Format: Article
Language:English
Subjects:
Charge transfer
Charge transport
Density functional theory
Ferromagnetism
Insulators
Magnetic moments
Magnetoresistance
Magnetoresistivity
Metal-insulator transition
Molybdenum disulfide
Nanoparticles
Phase transitions
Silver
Temperature dependence
Temperature effects
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Summary:MoS2 sheets are decorated by silver nanoparticles of size 10–12 nm. Localized holes are generated in Ag 4d levels carrying a magnetic moment due to the charge transfer effect at the interface and formation of Ag-S bonds. Temperature-dependent charge transport shows a metal-insulator (M-I) transition; the metallic phase is supported by the transition from negative to positive magnetoresistance and enhanced polarizability near the M-I transition. Observed ferromagnetism arises due to dominant coupling among the spins of localized holes in Ag nanoparticles at lower temperature. Density functional theory calculation is carried out to establish the charge transfer effect. The amount of charge transferred from Ag to MoS2 is evaluated from Bader charge analysis and the temperature effect is verified by a Nosé thermostat with the NVT ensemble method.
ISSN:2469-9950
2469-9969
DOI:10.1103/PhysRevB.98.014109