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

Kód výsledku v 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>

Nalezeny alternativní kódy

RIV/00216305:26620/23:PU147995

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10302 - Condensed matter physics (including formerly solid state physics, supercond.)

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2023

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Physical Review B

ISSN

2469-9950

e-ISSN

2469-9969

Svazek periodika

107

Číslo periodika v rámci svazku

15

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

13

Strana od-do

155202

Kód UT WoS článku

000974668400002

EID výsledku v databázi Scopus

2-s2.0-85158906878