Optical and EPR spectroscopy of manganese doped LiNaGe₄O₉ single crystals

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26620%2F24%3APU152389" target="_blank" >RIV/00216305:26620/24:PU152389 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/pii/S0925346724009765?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0925346724009765?via%3Dihub</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.optmat.2024.115793" target="_blank" >10.1016/j.optmat.2024.115793</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Optical and EPR spectroscopy of manganese doped LiNaGe₄O₉ single crystals

Popis výsledku v původním jazyce

The paper presents data on the study of optical absorption, photoluminescence and EPR of lithium-sodium tetragermanate crystals (LiNaGe4O9) doped with Mn ions. Optical spectra were measured in the range 11000-45000 cm(-1) and temperatures 77-300 K. They are attributed to manganese in the +4 charge state. From the analysis of optical spectra, the crystal field strength Dq = 2175.2 cm-1 and Racah parameters A = 4065 cm(-1), B = 813 cm(-1), C = 3239 cm(-1) were determined for the Mn4+ ions. The value of the Huang-Rhys factor SFHR = 17.56 indicates a strong electron-phonon interaction of the Mn4+ ion. The presence of Mn4+ ions was further confirmed by measurement of EPR spectra at microwave frequencies 8.9 and 320 GHz. EPR data show that Mn4+ ions occupy two structurally nonequivalent lattice sites with the formation of two Mn4+ centers: Mn1 and Mn2. From the angular dependences of the EPR spectra, the components of the g factor and the hyperfine interaction tensor A, the parameters of the axial D and rhombic E crystal field were determined for both centers. The axial constant D is large for both centers: 0.644 and 0.560 cm(-1), respectively. Analysis of optical and EPR spectroscopic data testifies that Mn4+ ions replace the Ge4+ ions in oxygen octahedrons within the host. Structurally nonequivalent centers are attributed to manganese ions located in undistorted lattice sites (Mn1) and in sites perturbed by the Li-Na antisite defect (Mn2).

Název v anglickém jazyce

Optical and EPR spectroscopy of manganese doped LiNaGe₄O₉ single crystals

Popis výsledku anglicky

The paper presents data on the study of optical absorption, photoluminescence and EPR of lithium-sodium tetragermanate crystals (LiNaGe4O9) doped with Mn ions. Optical spectra were measured in the range 11000-45000 cm(-1) and temperatures 77-300 K. They are attributed to manganese in the +4 charge state. From the analysis of optical spectra, the crystal field strength Dq = 2175.2 cm-1 and Racah parameters A = 4065 cm(-1), B = 813 cm(-1), C = 3239 cm(-1) were determined for the Mn4+ ions. The value of the Huang-Rhys factor SFHR = 17.56 indicates a strong electron-phonon interaction of the Mn4+ ion. The presence of Mn4+ ions was further confirmed by measurement of EPR spectra at microwave frequencies 8.9 and 320 GHz. EPR data show that Mn4+ ions occupy two structurally nonequivalent lattice sites with the formation of two Mn4+ centers: Mn1 and Mn2. From the angular dependences of the EPR spectra, the components of the g factor and the hyperfine interaction tensor A, the parameters of the axial D and rhombic E crystal field were determined for both centers. The axial constant D is large for both centers: 0.644 and 0.560 cm(-1), respectively. Analysis of optical and EPR spectroscopic data testifies that Mn4+ ions replace the Ge4+ ions in oxygen octahedrons within the host. Structurally nonequivalent centers are attributed to manganese ions located in undistorted lattice sites (Mn1) and in sites perturbed by the Li-Na antisite defect (Mn2).

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20500 - Materials engineering

Projekt

<a href="/cs/project/GA23-05578S" target="_blank" >GA23-05578S: Řízení spinových qubitů v kvantových paraelektrikách pomocí elektrického pole</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2024

Kód důvěrnosti údajů

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

Název periodika

OPTICAL MATERIALS

ISSN

0925-3467

e-ISSN

1873-1252

Svazek periodika

154

Číslo periodika v rámci svazku

115793

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

9

Strana od-do

„“-„“

Kód UT WoS článku

001272718200001

EID výsledku v databázi Scopus

2-s2.0-85198025086