Spin dynamics of exchange-coupled nitrogen donors in heavily doped n-type 15R SiC monocrystals: Multifrequency EPR and EDMR study

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A_____%2F23%3A00579279" target="_blank" >RIV/68378271:_____/23:00579279 - isvavai.cz</a>
Alternative codes found
RIV/00216305:26620/23:PU147995
Result on the web
<a href="https://doi.org/10.1103/PhysRevB.107.155202" target="_blank" >https://doi.org/10.1103/PhysRevB.107.155202</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1103/PhysRevB.107.155202" target="_blank" >10.1103/PhysRevB.107.155202</a>

Result language
angličtina
Original language name
Spin dynamics of exchange-coupled nitrogen donors in heavily doped n-type 15R SiC monocrystals: Multifrequency EPR and EDMR study
Original language description
We report on the study of nitrogen-doped 15R SiC monocrystals with (ND–NA)~51018 cm-3 using multi-frequency electron paramagnetic resonance (EPR) and electrically-detected magnetic resonance (EDMR) spectroscopic methods in the MW frequency 9.4-328.84 GHz at 4.2-300 K. A single intensive S-line with dominates the EPR spectrum in 15R SiC at T<160 K due to the exchange-coupled nitrogen (N) donors at quasi-cubic “k1” site. It was concluded that at T<90 K, the exchange coupling occurs between localized donor electrons, while at 90-150 K the interaction between exchange-coupled N donors and conduction electrons takes place. At 20-160 K, the S-line EPR width is characterized by a two-phonon Orbach relaxation process with the activation energy of ~6.5 meV corresponding to the valley-orbit splitting values for N donors in 15R SiC. The variable-range hopping regime obeying the T1/4 law takes place at T<20 K leading to the appearance of the S-line in the EDMR spectrum at low temperatures. The appearance of the EDMR signal from exchange-coupled N donors is caused by the EPR-induced temperature increase mechanism and the spin-flip hops process.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10302 - Condensed matter physics (including formerly solid state physics, supercond.)

Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2023
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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