Spin exchange dynamics in 4H SiC monocrystals with different nitrogen donor concentrations

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A_____%2F23%3A00577456" target="_blank" >RIV/68378271:_____/23:00577456 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1063/5.0172320" target="_blank" >https://doi.org/10.1063/5.0172320</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1063/5.0172320" target="_blank" >10.1063/5.0172320</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Spin exchange dynamics in 4H SiC monocrystals with different nitrogen donor concentrations

Popis výsledku v původním jazyce

In this manuscript, we provide a comprehensive study of the spin coupling dynamics between conduction electrons and N donors in monocrystalline 4H SiC with concentrations of N donors from 10^17 to 5×10^19 cm^−3 by EPR and MW perturbation techniques at T=4.2–300 K. At low T, two triplets due to N donors in cubic (Nk) hexagonal (Nh) positions and triplet arisen from spin-interaction between Nh and Nk were observed in 4H SiC with Nd−Na≈10^17 cm^−3. A single S-line dominates the EPR spectra in all investigated samples at high T. It was established that this line occurs due to the exchange coupling of localized electrons (dominate at low T) and non-localized electrons (dominate at high T). Using the theoretical fitting of the temperature variation of S-line EPR linewidth in 4H SiC with Nd–Na≤5×10^18 cm^−3, the energy levels of 57–65 meV that correlate with the valley-orbit splitting values for Nk in 4H SiC monocrystals were obtained.

Název v anglickém jazyce

Spin exchange dynamics in 4H SiC monocrystals with different nitrogen donor concentrations

Popis výsledku anglicky

In this manuscript, we provide a comprehensive study of the spin coupling dynamics between conduction electrons and N donors in monocrystalline 4H SiC with concentrations of N donors from 10^17 to 5×10^19 cm^−3 by EPR and MW perturbation techniques at T=4.2–300 K. At low T, two triplets due to N donors in cubic (Nk) hexagonal (Nh) positions and triplet arisen from spin-interaction between Nh and Nk were observed in 4H SiC with Nd−Na≈10^17 cm^−3. A single S-line dominates the EPR spectra in all investigated samples at high T. It was established that this line occurs due to the exchange coupling of localized electrons (dominate at low T) and non-localized electrons (dominate at high T). Using the theoretical fitting of the temperature variation of S-line EPR linewidth in 4H SiC with Nd–Na≤5×10^18 cm^−3, the energy levels of 57–65 meV that correlate with the valley-orbit splitting values for Nk in 4H SiC monocrystals were obtained.

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

<a href="/cs/project/EF16_019%2F0000760" target="_blank" >EF16_019/0000760: Fyzika pevných látek pro 21. století</a><br>

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

Journal of Applied Physics

ISSN

0021-8979

e-ISSN

1089-7550

Svazek periodika

134

Číslo periodika v rámci svazku

14

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

11

Strana od-do

145702

Kód UT WoS článku

001082652600004

EID výsledku v databázi Scopus

2-s2.0-85174801121