Vibrational modes and overlap matrix of LiNb1-xTaxO3 mixed crystals

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A_____%2F19%3A00504703" target="_blank" >RIV/68378271:_____/19:00504703 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1103/physrevb.99.094306" target="_blank" >https://doi.org/10.1103/physrevb.99.094306</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1103/PhysRevB.99.094306" target="_blank" >10.1103/PhysRevB.99.094306</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Vibrational modes and overlap matrix of LiNb1-xTaxO3 mixed crystals

Popis výsledku v původním jazyce

The wave numbers and strengths of the lattice vibrational modes of LiNbO3-LiTaO3 solid solutions have been studied by Raman and IR spectroscopy. The substitution of Nb by Ta induces shifts of wave numbers and intensities of phonon modes indicating a one-phonon behavior. The wave numbers of low-frequency vibrations soften with the increased atomic mass. The frequencies of most of the high-frequency modes increase with the Ta/Nb ratio. A qualitative relation between the shift of transverse and longitudinal modes in the solid solutions has been found on the basis of an overlap matrix. The exceptional softening of several high-frequency modes with the replacement of Nb by Ta originates from strong interaction of these modes with modes at low frequencies according to the overlap matrix. The intensities of the Raman modes are strongly modulated by the electronic properties with Ta/Nb substitution and this explains their role in the physical properties of LiNbO3 and LiTaO3.

Název v anglickém jazyce

Vibrational modes and overlap matrix of LiNb1-xTaxO3 mixed crystals

Popis výsledku anglicky

The wave numbers and strengths of the lattice vibrational modes of LiNbO3-LiTaO3 solid solutions have been studied by Raman and IR spectroscopy. The substitution of Nb by Ta induces shifts of wave numbers and intensities of phonon modes indicating a one-phonon behavior. The wave numbers of low-frequency vibrations soften with the increased atomic mass. The frequencies of most of the high-frequency modes increase with the Ta/Nb ratio. A qualitative relation between the shift of transverse and longitudinal modes in the solid solutions has been found on the basis of an overlap matrix. The exceptional softening of several high-frequency modes with the replacement of Nb by Ta originates from strong interaction of these modes with modes at low frequencies according to the overlap matrix. The intensities of the Raman modes are strongly modulated by the electronic properties with Ta/Nb substitution and this explains their role in the physical properties of LiNbO3 and LiTaO3.

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

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2019

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

—

Svazek periodika

99

Číslo periodika v rámci svazku

9

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

13

Strana od-do

1-13

Kód UT WoS článku

000461052000001

EID výsledku v databázi Scopus

2-s2.0-85063142852