Origin of photovoltaic effect in superconducting YBa2Cu3O6.96 ceramics

Yang, Feng; Han, Mengyuan; Chang, Fanggao

doi:10.1038/srep11504

“…We define the short-circuit current J sc as the current measured when a zero bias is applied across the junction, and the open circuit voltage V oc as the voltage across the device when no electrical current is measured. While V oc ( ∼ 0.5 V) is comparable to that observed earlier in cuprate based photovoltaic cells 48,49 , J sc is several orders of magnitude higher 48,49 and indeed compares to that of silicon based devices 50 . Figure 4b displays V oc as a function of the junction's remnant conductance measured at V read = 100 mV, G 100 .…”

Section: Optical Effectssupporting

confidence: 82%

Bimodal ionic photomemristor based on a high-temperature oxide superconductor/semiconductor junction

Hage

¹

,

Humbert

²

,

Rouco

³

et al. 2023

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Memristors, a cornerstone for neuromorphic electronics, respond to the history of electrical stimuli by varying their electrical resistance across a continuum of states. Much effort has been recently devoted to developing an analogous response to optical excitation. Here we realize a novel tunnelling photo-memristor whose behaviour is bimodal: its resistance is determined by the dual electrical-optical history. This is obtained in a device of ultimate simplicity: an interface between a high-temperature superconductor and a transparent semiconductor. The exploited mechanism is a reversible nanoscale redox reaction between both materials, whose oxygen content determines the electron tunnelling rate across their interface. The redox reaction is optically driven via an interplay between electrochemistry, photovoltaic effects and photo-assisted ion migration. Besides their fundamental interest, the unveiled electro-optic memory effects have considerable technological potential. Especially in combination with high-temperature superconductivity which, in addition to facilitating low-dissipation connectivity, brings photo-memristive effects to the realm of superconducting electronics.

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“…In fig. 1d, the temperaturedependent magnetisation for the (BTO/YBCO) 1 multilayer is depicted, and we reach a superconducting transition temperature decrease to T SC ∼ 70 K. This decrease can be associated to different mechanisms such as tensile/compressive strain in BTO/YBCO interfaces, interface atom migration during the film growth 51 , oxygen losses 52,53 , dislocations 54 , Cooper pairs breaks [55][56][57] , among others 58 , but we stress that the superconducting state in the PC is preserved.…”

Section: A Structural Propertiesmentioning

confidence: 69%

Experimental realisation of tunable ferroelectric/superconductor (BTO/YBCO)N/STO 1D photonic crystals in the whole visible spectrum

González,

Ordoñez,

Melo-Luna

et al. 2019

Preprint

0

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Emergent technologies that make use of novel materials and quantum properties of light states are at the forefront in the race for the physical implementation, encoding and transmission of information. Photonic crystals (PCs) enter this paradigm with optical materials that allow the control of light propagation and can be used for optical communication 1 , and photonics and electronics integration 2,3 making use of materials ranging from semiconductors 4 , to metals 5 , metamaterials 6 , and topological insulators 7 , to mention but a few. In particular, here we show how designer superconductor materials integrated into PCs fabrication allow for an extraordinary reduction of electromagnetic waves damping and possibilitate their optimal propagation and tuning through the structure, below critical superconductor temperature. We experimentally demonstrate, for the first time, a successful integration of ferroelectric and superconductor materials into a one-dimensional (1D) PC composed of (BTO/YBCO)N/STO bilayers that work in the whole visible spectrum, and below (and above) critical superconductor temperature (measured in the 10-300 K range). Theoretical calculations support, for different number of bilayers N , the effectiveness of the produced 1D PCs and pave the way for novel optoelectronics integration and information processing in the visible spectrum at low temperature, while preserving their electric and optical properties.

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“…1 c, the temperature-dependent magnetisation for the bilayer is depicted, and a superconducting transition temperature decrease to is reached. This decrease can be associated with different mechanisms such as tensile/compressive strain in BTO/YBCO interfaces, interface atom migration during the film growth 62 , oxygen losses 63 , 64 , dislocations 65 , and Cooper pair breaks 66 – 68 , among others 69 . However, we emphasize that the PC superconducting state is preserved.…”

Section: Resultsmentioning

confidence: 99%

Experimental realisation of tunable ferroelectric/superconductor $$({\text {B}} {\text {T}} {\text {O}}/{\text {Y}} {\text {B}}{\text {C}} {\text {O}})_{{\text {N}}}/{\text {S}}{\text {T}}{\text {O}}$$ 1D photonic crystals in the whole visible spectrum

González

¹

,

Ordoñez

²

,

Melo-Luna

³

et al. 2020

Sci Rep

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Emergent technologies that make use of novel materials and quantum properties of light states are at the forefront in the race for the physical implementation, encoding and transmission of information. Photonic crystals (PCs) enter this paradigm with optical materials that allow the control of light propagation and can be used for optical communication, and photonics and electronics integration, making use of materials ranging from semiconductors, to metals, metamaterials, and topological insulators, to mention but a few. Here, we show how designer superconductor materials integrated into PCs fabrication allow for an extraordinary reduction of electromagnetic waves damping, making possible their optimal propagation and tuning through the structure, below critical superconductor temperature. We experimentally demonstrate, for the first time, a successful integration of ferroelectric and superconductor materials into a one-dimensional (1D) PC composed of (BTO/YBCO) N /STO bilayers that work in the whole visible spectrum, and below (and above) critical superconductor temperature T C = 80 K. Theoretical calculations support, for different number of bilayers N, the effectiveness of the produced 1D PCs and may pave the way for novel optoelectronics integration and information processing in the visible spectrum, while preserving their electric and optical properties. The use of electromagnetic (EM) waves as information carriers for communication systems has been in place for many years 1,2 ; as such, EM wavelengths make possible the transmission over large distances but, at the same time, they limit the amount of information they can convey by their frequency: the larger the carrier frequency, the larger the available transmission bandwidth and thus the information-carrying capacity of the communication system 3. For this reason, quantum artificial nanostructured materials such as photonic crystals that are able to transmit at high frequencies and that concentrate the available power within the transmitted electromagnetic wave, thus giving an improved system performance, are desired 4. PCs are artificial periodic structures characterised by a periodic variation of the refractive index with a consequent periodic spatial variation of the dielectric constant, which may be tailored to control light properties 4. They, therefore, allow the appearance of defined frequency ranges and address the issue of forbidden/allowed propagation of electromagnetic waves. As a consequence, the control and tunability of PCs opens a new perspective for information processing and technological

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Origin of photovoltaic effect in superconducting YBa2Cu3O6.96 ceramics

Cited by 13 publications

References 32 publications

Bimodal ionic photomemristor based on a high-temperature oxide superconductor/semiconductor junction

Bimodal ionic photomemristor based on a high-temperature oxide superconductor/semiconductor junction

Experimental realisation of tunable ferroelectric/superconductor (BTO/YBCO)N/STO 1D photonic crystals in the whole visible spectrum

Experimental realisation of tunable ferroelectric/superconductor $$({\text {B}} {\text {T}} {\text {O}}/{\text {Y}} {\text {B}}{\text {C}} {\text {O}})_{{\text {N}}}/{\text {S}}{\text {T}}{\text {O}}$$ 1D photonic crystals in the whole visible spectrum

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