Nanoscale and macroscopic electrical ac transport along conductive domain walls in lithium niobate single crystals

Schröder, Mathias; Chen, Xi; Haußmann, Alexander; Thiessen, A.; Poppe, Jan; Bonnell, Dawn A.; Eng, Lukas M.

doi:10.1088/2053-1591/1/3/035012

Cited by 38 publications

(36 citation statements)

References 33 publications

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“…Within the past years, ferroelectric domain walls (DWs) have attracted large attention due to their unique capabilities serving as reconfigurable 2‐dimensional (2D) conductors embedded in a fully insulating matrix. This effect of “ferroelectric domain wall conductivity” has been reported for thin films as well as single crystals . Both these experiments and theoretical studies manifest that the intrinsic polarization charges at DWs are crucial for triggering DW conductivity in ferroelectrics, as they lead to the accumulation of mobile charge carriers, i.e.…”

Section: Introductionmentioning

confidence: 56%

“…Polarization charges, on the other hand, are directly related to the physical orientation of DWs relative to the polar (order) axis of the ferroelectric. In fact, several works have consistently reported lately of such inclined DWs investigating a manifold of different techniques and systems; the bottom‐line of all these inspections is that exactly straight DWs, though being the common ground state of both temporal and spatial stability, do exist in theory only, even at room temperature.…”

Section: Introductionmentioning

confidence: 99%

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Three‐Dimensional, Time‐Resolved Profiling of Ferroelectric Domain Wall Dynamics by Spectral‐Domain Optical Coherence Tomography

et al. 2017

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We apply here spectral-domain optical coherence tomography (SD-OCT) for the precise detection and temporal tracking of ferroelectric domain walls (DWs) in magnesium-doped periodically poled lithium niobate (Mg:PPLN). We reproducibly map static DWs at an axial (depth) resolution down to ß 0.6 μm, being located up to 0.5 mm well inside the single crystalline Mg:PPLN sample. We show that a full 3-dimensional (3D) reconstruction of the DW geometry is possible from the collected data, when applying a special algorithm that accounts for the nonlinear optical dispersion of the material. Our OCT investigation provides valuable reference information on the DWs' polarization charge distribution, which is known to be the key to the electrical conductivity of ferroelectric DWs in such systems. Hence, we carefully analyze the SD-OCT signal dependence both when varying the direction of incident polarization, and when applying electrical fields along the polar axis. Surprisingly, the large backreflection intensities recorded under extraordinary polarization are not affected by any electrical field, at least for field strengths below the switching threshold, while no significant signals above noise floor are detected under ordinary polarization. Finally, we employed the high-speed SD-OCT setup for the real-time DW tracking upon ferroelectric domain switching under high external fields.

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Section: Introductionmentioning

confidence: 56%

Section: Introductionmentioning

confidence: 99%

Three‐Dimensional, Time‐Resolved Profiling of Ferroelectric Domain Wall Dynamics by Spectral‐Domain Optical Coherence Tomography

et al. 2017

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“…The CDWs response was considered as a result of the reversible motion of the domain wall steps [8,9]. Recently, the significant enhancement of the CDWs contribution into dielectric permittivity under superbandgap UV illumination has been demonstrated [10].…”

Section: Introductionmentioning

confidence: 99%

Dielectric Permittivity Enhancement By Charged Domain Walls Formation In Stoichiometric Lithium Niobate

Есин¹,

Ахматханов²,

Shur³

2016

Kms

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We present an experimental study of contribution of charged domain walls into dielectric permittivity of lithium niobate. It has been shown that formation of dense structure with spike-like domains leads to order of magnitude increase of permittivity, which gradually decreases with time. The decrease rate accelerates under DC bias. Dielectric permittivity decreases linearly with a logarithm of frequency. The obtained results were explained considering vibration of the steps on the charged domain walls.

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“…The strong increase of the bulk conductivity during the poling process induced by formation of CDW has been revealed in MgO doped LN (MgOLN) [12]. The DC and AC transport was investigated in MgOLN both macroscopically and locally; however, an increase of CDW conductivity without photoactive light illumination was not revealed [13,27]. It was shown that the appearance of through CDW led to exponential increase and subsequent exponential decrease of conductivity; the characteristic times of both processes demonstrated activation-type temperature dependence [15].…”

Section: Introductionmentioning

confidence: 99%

Increase and Relaxation of Abnormal Conduction Current in Lithium Niobate Crystals with Charged Domain Walls

et al. 2015

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The increase and relaxation of the conduction current caused by formation of intergrown charged domain walls (CDW) during polarization reversal have been studied in stoichiometric lithium niobate. The 10 3 -10 4 times increase of the conduction current was revealed in the temperature range 100-200 C. The current, measured during polarization reversal, consists of the conventional switching current and the conduction current along CDW dominating for T>200 C. The model based on the complex conductivity pathway along CDW was proposed. The current data were analyzed in terms of the Kolmogorov-Avrami model taking into account the input of the CDW conductivity.

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Nanoscale and macroscopic electrical ac transport along conductive domain walls in lithium niobate single crystals

Cited by 38 publications

References 33 publications

Three‐Dimensional, Time‐Resolved Profiling of Ferroelectric Domain Wall Dynamics by Spectral‐Domain Optical Coherence Tomography

Three‐Dimensional, Time‐Resolved Profiling of Ferroelectric Domain Wall Dynamics by Spectral‐Domain Optical Coherence Tomography

Dielectric Permittivity Enhancement By Charged Domain Walls Formation In Stoichiometric Lithium Niobate

Increase and Relaxation of Abnormal Conduction Current in Lithium Niobate Crystals with Charged Domain Walls

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