A Low-Field Temperature Dependent EPR Signal in Terraced MgO:Mn2+ Nanoparticles: An Enhanced Zeeman Splitting in the Wide-Bandgap Oxide

A Low-Field Temperature Dependent EPR Signal in Terraced MgO:Mn2+ Nanoparticles: An Enhanced Zeeman Splitting in the Wide-Bandgap Oxide

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...

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Main Authors: Peter V. Pikhitsa, Sukbyung Chae, Seungha Shin, Mansoo Choi
Format: Article
Language:English
Published: Hindawi Limited 2017-01-01
Series:Journal of Spectroscopy
Online Access:http://dx.doi.org/10.1155/2017/8276520
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spelling doaj-89629a7f4a67451486211ff7295739ee2020-11-24T21:04:00ZengHindawi LimitedJournal of Spectroscopy2314-49202314-49392017-01-01201710.1155/2017/82765208276520A Low-Field Temperature Dependent EPR Signal in Terraced MgO:Mn2+ Nanoparticles: An Enhanced Zeeman Splitting in the Wide-Bandgap OxidePeter V. Pikhitsa0Sukbyung Chae1Seungha Shin2Mansoo Choi3Global Frontier Center for Multiscale Energy Systems, Division of WCU Multiscale Mechanical Design, School of Mechanical and Aerospace Engineering, Seoul National University, Seoul 151-742, Republic of KoreaGlobal Frontier Center for Multiscale Energy Systems, Division of WCU Multiscale Mechanical Design, School of Mechanical and Aerospace Engineering, Seoul National University, Seoul 151-742, Republic of KoreaGlobal Frontier Center for Multiscale Energy Systems, Division of WCU Multiscale Mechanical Design, School of Mechanical and Aerospace Engineering, Seoul National University, Seoul 151-742, Republic of KoreaGlobal Frontier Center for Multiscale Energy Systems, Division of WCU Multiscale Mechanical Design, School of Mechanical and Aerospace Engineering, Seoul National University, Seoul 151-742, Republic of KoreaMn2+ 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.http://dx.doi.org/10.1155/2017/8276520
collection DOAJ
language English
format Article
sources DOAJ
author Peter V. Pikhitsa
Sukbyung Chae
Seungha Shin
Mansoo Choi
spellingShingle Peter V. Pikhitsa
Sukbyung Chae
Seungha Shin
Mansoo Choi
A Low-Field Temperature Dependent EPR Signal in Terraced MgO:Mn2+ Nanoparticles: An Enhanced Zeeman Splitting in the Wide-Bandgap Oxide
Journal of Spectroscopy
author_facet Peter V. Pikhitsa
Sukbyung Chae
Seungha Shin
Mansoo Choi
author_sort Peter V. Pikhitsa
title A Low-Field Temperature Dependent EPR Signal in Terraced MgO:Mn2+ Nanoparticles: An Enhanced Zeeman Splitting in the Wide-Bandgap Oxide
title_short A Low-Field Temperature Dependent EPR Signal in Terraced MgO:Mn2+ Nanoparticles: An Enhanced Zeeman Splitting in the Wide-Bandgap Oxide
title_full A Low-Field Temperature Dependent EPR Signal in Terraced MgO:Mn2+ Nanoparticles: An Enhanced Zeeman Splitting in the Wide-Bandgap Oxide
title_fullStr A Low-Field Temperature Dependent EPR Signal in Terraced MgO:Mn2+ Nanoparticles: An Enhanced Zeeman Splitting in the Wide-Bandgap Oxide
title_full_unstemmed A Low-Field Temperature Dependent EPR Signal in Terraced MgO:Mn2+ Nanoparticles: An Enhanced Zeeman Splitting in the Wide-Bandgap Oxide
title_sort low-field temperature dependent epr signal in terraced mgo:mn2+ nanoparticles: an enhanced zeeman splitting in the wide-bandgap oxide
publisher Hindawi Limited
series Journal of Spectroscopy
issn 2314-4920
2314-4939
publishDate 2017-01-01
description 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.
url http://dx.doi.org/10.1155/2017/8276520
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AT sukbyungchae alowfieldtemperaturedependenteprsignalinterracedmgomn2nanoparticlesanenhancedzeemansplittinginthewidebandgapoxide
AT seunghashin alowfieldtemperaturedependenteprsignalinterracedmgomn2nanoparticlesanenhancedzeemansplittinginthewidebandgapoxide
AT mansoochoi alowfieldtemperaturedependenteprsignalinterracedmgomn2nanoparticlesanenhancedzeemansplittinginthewidebandgapoxide
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AT sukbyungchae lowfieldtemperaturedependenteprsignalinterracedmgomn2nanoparticlesanenhancedzeemansplittinginthewidebandgapoxide
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AT mansoochoi lowfieldtemperaturedependenteprsignalinterracedmgomn2nanoparticlesanenhancedzeemansplittinginthewidebandgapoxide
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