Anisotropic quasi-static permittivity of rare-earth scandate single crystals measured by terahertz spectroscopy
Taherian, Afrouz ; Cooke, Jacqueline ; Schubert, Mathias LU
and Sensale-Rodriguez, Berardi
(2024)
In Journal of Applied Physics
135(17).
- Abstract
We report the real-valued static and complex-valued quasi-static anisotropic permittivity parameters of rare-earth scandate orthorhombic single crystal GdScO3 (GSO), TbScO3 (TSO), and DyScO3 (DSO). Employing continuous-wave terahertz spectroscopy (0.2-1 THz), the complex permittivity was extracted using an anisotropic ambient-film-ambient model. Data obtained from multiple samples of the same oxides and different surface cuts were analyzed simultaneously. The zero-frequency limit of the modeled data indicates that at room temperature the real part of the dielectric tensor components for GSO are ɛa = 22.7, ɛb = 19.3, and ɛc = 28.1; for DSO, ɛa = 20.3,... (More)
We report the real-valued static and complex-valued quasi-static anisotropic permittivity parameters of rare-earth scandate orthorhombic single crystal GdScO3 (GSO), TbScO3 (TSO), and DyScO3 (DSO). Employing continuous-wave terahertz spectroscopy (0.2-1 THz), the complex permittivity was extracted using an anisotropic ambient-film-ambient model. Data obtained from multiple samples of the same oxides and different surface cuts were analyzed simultaneously. The zero-frequency limit of the modeled data indicates that at room temperature the real part of the dielectric tensor components for GSO are ɛa = 22.7, ɛb = 19.3, and ɛc = 28.1; for DSO, ɛa = 20.3, ɛb = 17.4, and ɛc = 31.1; and for TSO, ɛa = 21.6, ɛb = 18.1, and ɛc = 30.3, with a, b, and c crystallographic axes constituting the principal directions for the permittivity tensor. These results are in excellent agreement with expectations from theoretical computations and with scarcely available data from previous experimental studies. Furthermore, our results evidence a noticeable attenuation, which increases with frequency, and are very significant especially at the higher frequency end of the measurement and along the c-direction in all samples. We suggest the attenuation is most likely caused by the onset of absorption due to long-wavelength active optical phonon modes. These results are important for electronic and potential sub-terahertz applications (e.g., quarter-wave plate) benefiting from the large index contrast along different directions in these materials.
(Less)
- author
- Taherian, Afrouz
; Cooke, Jacqueline
; Schubert, Mathias
LU
and Sensale-Rodriguez, Berardi
- organization
- publishing date
- 2024-05-07
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Journal of Applied Physics
- volume
- 135
- issue
- 17
- article number
- 173102
- publisher
- American Institute of Physics (AIP)
- external identifiers
-
- scopus:85192269149
- ISSN
- 0021-8979
- DOI
- 10.1063/5.0207198
- language
- English
- LU publication?
- yes
- id
- 4b244498-c0e2-463b-9036-ce9e3f935379
- date added to LUP
- 2024-05-21 13:21:39
- date last changed
- 2024-05-21 13:21:51
@article{4b244498-c0e2-463b-9036-ce9e3f935379,
abstract = {{<p>We report the real-valued static and complex-valued quasi-static anisotropic permittivity parameters of rare-earth scandate orthorhombic single crystal GdScO<sub>3</sub> (GSO), TbScO<sub>3</sub> (TSO), and DyScO<sub>3</sub> (DSO). Employing continuous-wave terahertz spectroscopy (0.2-1 THz), the complex permittivity was extracted using an anisotropic ambient-film-ambient model. Data obtained from multiple samples of the same oxides and different surface cuts were analyzed simultaneously. The zero-frequency limit of the modeled data indicates that at room temperature the real part of the dielectric tensor components for GSO are ɛ<sub>a</sub> = 22.7, ɛ<sub>b</sub> = 19.3, and ɛ<sub>c</sub> = 28.1; for DSO, ɛ<sub>a</sub> = 20.3, ɛ<sub>b</sub> = 17.4, and ɛ<sub>c</sub> = 31.1; and for TSO, ɛ<sub>a</sub> = 21.6, ɛ<sub>b</sub> = 18.1, and ɛ<sub>c</sub> = 30.3, with a, b, and c crystallographic axes constituting the principal directions for the permittivity tensor. These results are in excellent agreement with expectations from theoretical computations and with scarcely available data from previous experimental studies. Furthermore, our results evidence a noticeable attenuation, which increases with frequency, and are very significant especially at the higher frequency end of the measurement and along the c-direction in all samples. We suggest the attenuation is most likely caused by the onset of absorption due to long-wavelength active optical phonon modes. These results are important for electronic and potential sub-terahertz applications (e.g., quarter-wave plate) benefiting from the large index contrast along different directions in these materials.</p>}},
author = {{Taherian, Afrouz and Cooke, Jacqueline and Schubert, Mathias and Sensale-Rodriguez, Berardi}},
issn = {{0021-8979}},
language = {{eng}},
month = {{05}},
number = {{17}},
publisher = {{American Institute of Physics (AIP)}},
series = {{Journal of Applied Physics}},
title = {{Anisotropic quasi-static permittivity of rare-earth scandate single crystals measured by terahertz spectroscopy}},
url = {{http://dx.doi.org/10.1063/5.0207198}},
doi = {{10.1063/5.0207198}},
volume = {{135}},
year = {{2024}},
}