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A Low-Field Temperature Dependent EPR Signal in Terraced MgO:Mn2+ Nanoparticles: An Enhanced Zeeman Splitting in the Wide-Bandgap Oxide
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نویسنده
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pikhitsa p.v. ,chae s. ,shin s. ,choi m.
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منبع
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journal of spectroscopy - 2017 - دوره : 2017 - شماره : 0
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چکیده
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Mn2+ ion doping is used as an electron paramagnetic resonance (epr) probe to investigate the influence of low-coordination structural defects such as step edges at the surface of terraced (001) mgo nanoparticles on the electronic properties. beside the well-known hyperfine sextet of mn2+ ions in the cubic crystal field of mgo,an additional epr feature with a striking nonmonotonous temperature dependent shift of the g-factor is observed in terraced nanoparticles in the temperature range from 4 k to room temperature. by linking the difference in the temperature dependence of the mn2+ sextet intensity in cubic and terraced nanoparticles with the possible s-d exchange shift and enhanced zeeman splitting we conclude that the novel epr feature originates from the loosely trapped charge-compensating carriers at the abundant structural defects at the surface of terraced nanoparticles due to their exchange interaction with neighboring mn2+ ions. copyright � 2017 peter v. pikhitsa et al.
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آدرس
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global frontier center for multiscale energy systems,division of wcu multiscale mechanical design,school of mechanical and aerospace engineering,seoul national university,seoul, South Korea, global frontier center for multiscale energy systems,division of wcu multiscale mechanical design,school of mechanical and aerospace engineering,seoul national university,seoul, South Korea, global frontier center for multiscale energy systems,division of wcu multiscale mechanical design,school of mechanical and aerospace engineering,seoul national university,seoul, South Korea, global frontier center for multiscale energy systems,division of wcu multiscale mechanical design,school of mechanical and aerospace engineering,seoul national university,seoul, South Korea
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Authors
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