---
_id: '61338'
abstract:
- lang: eng
text: Conductive ferroelectric domain walls (DWs) represent a promising topical
system for the development of nanoelectronic components and device sensors to
be operational at elevated temperatures. DWs show very different properties as
compared to their hosting bulk crystal, in particular with respect to the high
local electrical conductivity. The objective of this work is to demonstrate DW
conductivity up to temperatures as high as 400 °C which extends previous studies
significantly. Experimental investigation of the DW conductivity of charged, inclined
DWs is performed using 5 mol % MgO-doped lithium niobate single crystals. Current–voltage
( ) curves are determined by DC electrometer measurements and impedance spectroscopy
and found to be identical. Moreover, impedance spectroscopy enables to recognize
artifacts such as damaged electrodes. Temperature dependent measurements over
repeated heating cycles reveal two distinct thermal activation energies for a
given DW, with the higher of the activation energies only measured at higher temperatures.
Depending on the specific sample, the higher activation energy is found above
160 °C to 230 °C. This suggests, in turn, that more than one type of defect/polaron
is involved, and that the dominant transport mechanism changes with increasing
temperature. First principles atomistic modeling suggests that the conductivity
of inclined domain walls cannot be solely explained by the formation of a 2D carrier
gas and must be supported by hopping processes. This holds true even at temperatures
as high as 400 °C. Our investigations underline the potential to extend DW current
based nanoelectronic and sensor applications even into the so-far unexplored temperature
range up to 400 °C.
article_number: '116949'
article_type: original
author:
- first_name: Hendrik
full_name: Wulfmeier, Hendrik
last_name: Wulfmeier
- first_name: Uliana
full_name: Yakhnevych, Uliana
last_name: Yakhnevych
- first_name: Cornelius
full_name: Boekhoff, Cornelius
last_name: Boekhoff
- first_name: Allan
full_name: Diima, Allan
last_name: Diima
- first_name: Marlo
full_name: Kunzner, Marlo
last_name: Kunzner
- first_name: Leonard M.
full_name: Verhoff, Leonard M.
last_name: Verhoff
- first_name: Jonas
full_name: Paul, Jonas
last_name: Paul
- first_name: Julius
full_name: Ratzenberger, Julius
last_name: Ratzenberger
- first_name: Elke
full_name: Beyreuther, Elke
last_name: Beyreuther
- first_name: Joshua
full_name: Gössel, Joshua
last_name: Gössel
- first_name: Iuliia
full_name: Kiseleva, Iuliia
last_name: Kiseleva
- first_name: Michael
full_name: Rüsing, Michael
id: '22501'
last_name: Rüsing
orcid: 0000-0003-4682-4577
- first_name: Simone
full_name: Sanna, Simone
last_name: Sanna
- first_name: Lukas M.
full_name: Eng, Lukas M.
last_name: Eng
- first_name: Holger
full_name: Fritze, Holger
last_name: Fritze
citation:
ama: Wulfmeier H, Yakhnevych U, Boekhoff C, et al. Demonstration of domain wall
current in MgO-doped lithium niobate single crystals up to 400°C. Solid State
Ionics. 2025;429. doi:10.1016/j.ssi.2025.116949
apa: Wulfmeier, H., Yakhnevych, U., Boekhoff, C., Diima, A., Kunzner, M., Verhoff,
L. M., Paul, J., Ratzenberger, J., Beyreuther, E., Gössel, J., Kiseleva, I., Rüsing,
M., Sanna, S., Eng, L. M., & Fritze, H. (2025). Demonstration of domain wall
current in MgO-doped lithium niobate single crystals up to 400°C. Solid State
Ionics, 429, Article 116949. https://doi.org/10.1016/j.ssi.2025.116949
bibtex: '@article{Wulfmeier_Yakhnevych_Boekhoff_Diima_Kunzner_Verhoff_Paul_Ratzenberger_Beyreuther_Gössel_et
al._2025, title={Demonstration of domain wall current in MgO-doped lithium niobate
single crystals up to 400°C}, volume={429}, DOI={10.1016/j.ssi.2025.116949},
number={116949}, journal={Solid State Ionics}, publisher={Elsevier BV}, author={Wulfmeier,
Hendrik and Yakhnevych, Uliana and Boekhoff, Cornelius and Diima, Allan and Kunzner,
Marlo and Verhoff, Leonard M. and Paul, Jonas and Ratzenberger, Julius and Beyreuther,
Elke and Gössel, Joshua and et al.}, year={2025} }'
chicago: Wulfmeier, Hendrik, Uliana Yakhnevych, Cornelius Boekhoff, Allan Diima,
Marlo Kunzner, Leonard M. Verhoff, Jonas Paul, et al. “Demonstration of Domain
Wall Current in MgO-Doped Lithium Niobate Single Crystals up to 400°C.” Solid
State Ionics 429 (2025). https://doi.org/10.1016/j.ssi.2025.116949.
ieee: 'H. Wulfmeier et al., “Demonstration of domain wall current in MgO-doped
lithium niobate single crystals up to 400°C,” Solid State Ionics, vol.
429, Art. no. 116949, 2025, doi: 10.1016/j.ssi.2025.116949.'
mla: Wulfmeier, Hendrik, et al. “Demonstration of Domain Wall Current in MgO-Doped
Lithium Niobate Single Crystals up to 400°C.” Solid State Ionics, vol.
429, 116949, Elsevier BV, 2025, doi:10.1016/j.ssi.2025.116949.
short: H. Wulfmeier, U. Yakhnevych, C. Boekhoff, A. Diima, M. Kunzner, L.M. Verhoff,
J. Paul, J. Ratzenberger, E. Beyreuther, J. Gössel, I. Kiseleva, M. Rüsing, S.
Sanna, L.M. Eng, H. Fritze, Solid State Ionics 429 (2025).
date_created: 2025-09-17T16:18:18Z
date_updated: 2025-09-17T16:19:51Z
department:
- _id: '15'
- _id: '288'
- _id: '623'
doi: 10.1016/j.ssi.2025.116949
intvolume: ' 429'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.1016/j.ssi.2025.116949
oa: '1'
publication: Solid State Ionics
publication_identifier:
issn:
- 0167-2738
publication_status: published
publisher: Elsevier BV
quality_controlled: '1'
status: public
title: Demonstration of domain wall current in MgO-doped lithium niobate single crystals
up to 400°C
type: journal_article
user_id: '22501'
volume: 429
year: '2025'
...