Nanoscale high-temperature superconductivity

Mohanty, Pritiraj; Wei, J.Y.T.; Ananth, V.; Morales, P.; Skocpol, W. J.

doi:10.1016/j.physc.2004.03.102

Cited by 15 publications

(11 citation statements)

References 17 publications

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“…Our values are lower than the depairing current, suggesting rather flux-flow regime [5], [16]. Differently from other measurements [13], [14], [16], we did not observe any increase of for the few microbridges measured below 150 nm. In all cases reduction of was observed, but a more systematic study is required.…”

Section: Device Characterization and Discussioncontrasting

confidence: 99%

“…On the other transport studies of nanoscale devices are considered very important Manuscript to possibly unveil several issues on HTS and its pairing mechanism, to discern various states in the HTS phase diagram by virtue of the system size [14], [15].…”

Section: Introductionmentioning

confidence: 99%

“…Bottom-up-like procedures where the film deposition is the last step in the nanofabrication process, and no further chemical or physical treatments are done after the film growth, represent a very promising field of activity for ultimate spatial resolution and for the realization of HTS nanowires [14]. Nevertheless, as an intermediate step and for a series of experiments and possible applications, the final limits of a top-down approach have to be still fully understood.…”

Section: Introductionmentioning

confidence: 99%

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YBCO Nanobridges: Simplified Fabrication Process by Using a Ti Hard Mask

Papari¹,

Carillo

Born

et al. 2009

IEEE Trans. Appl. Supercond.

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An innovative fabrication procedure has been developed to obtain YBa 2 Cu 3 O 7 x (YBCO) nanobridges from c-axis oriented films. The novelty regards the use of a thin titanium mask used in the patterning process. The use of the Ti makes simpler the fabrication procedure guaranteeing high quality devices, as demonstrated by transport measurements. Critical temperatures and critical current densities scale with the width of the microbridge down to 200 nm in agreement with most results available in literature. The actual properties of the devices, performances, yield and reproducibility, along with an accurate control on doping, may allow the use of these micro-bridges for nanoscale experiments.

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Section: Device Characterization and Discussioncontrasting

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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YBCO Nanobridges: Simplified Fabrication Process by Using a Ti Hard Mask

Papari¹,

Carillo

Born

et al. 2009

IEEE Trans. Appl. Supercond.

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“…The excellent quality of our YBCO nano bridges opens the way for foundational studies of nano-patterned unconventional superconductors where nanoscale ordering has a crucial role in building up the superconducting ground state [6,7]. Moreover, the pristine superconducting properties of our bridges enable the realization of nanosized quantum limited detectors such as YBCO nanoSQUIDs operational in a wide temperature range.…”

mentioning

confidence: 93%

Microwave Response of SuperconductingYBa2Cu3O7−δNanowire Bridges Sustaining the Critical Depairing Current: Evidence of Josephson-li

et al. 2013

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We have investigated the zero-field critical supercurrent of YBa 2 Cu 3 O 7−δ bridges patterned from 50 nm thick films as a function of bridge width, ranging from 2 µm to 50 nm. The critical current density monotonically increases for decreasing bridge width even for widths smaller than the Pearl length. This behavior is accounted for by considering current crowding effects at the junction between the bridge and the wider electrodes. Comparison to numerical calculations of the current distributions in our bridge geometries of various widths yields a (local) critical current density at 4.2 K of 1.3 × 10 8 A/cm 2 , the Ginzburg Landau depairing current density. The observation of up to 160 Shapiro-like steps in the current voltage characteristics under microwave irradiation substantiates the pristine character of our nano bridges with cross sections as small as 50 × 50 nm 2 .

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“…Sub-micron structures can also be fabricated by patterning a single crystal substrate prior to deposition. The substrate is patterned such that regions of the deposited film are physically separated through the creation of ridge or trench structures [14] or electrically isolated through the inhibition of the conductivity of select regions. The inhibition of conductivity can be achieved by destroying the local crystallinity of select regions.…”

mentioning

confidence: 99%

Selective epitaxial growth of submicron complex oxide structures by amorphous SrTiO3

Morales

DiCiano

Wei

2005

Applied Physics Letters

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A chemical-free technique for fabricating submicron complex oxide structures has been developed based on selective epitaxial growth. The crystallinity and hence the conductivity of the complex oxide is inhibited by amorphous SrTiO3 (STO). Using a combination of pulsed laser deposition and electron-beam lithography, amorphous STO barriers are first deposited on a single crystal substrate. A thin film is then deposited on the patterned substrate with the amorphous STO barriers acting to electrically and physically isolate different regions of the film. Since no chemical or physical etchants come in contact with the deposited film, its integrity and stability are preserved. This technique has successfully produced sub-micron YBa2Cu3O 7−δ and La 2/3 Ca 1/3 MnO3 structures.

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Nanoscale high-temperature superconductivity

Cited by 15 publications

References 17 publications

YBCO Nanobridges: Simplified Fabrication Process by Using a Ti Hard Mask

YBCO Nanobridges: Simplified Fabrication Process by Using a Ti Hard Mask

Microwave Response of SuperconductingYBa2Cu3O7−δNanowire Bridges Sustaining the Critical Depairing Current: Evidence of Josephson-li

Selective epitaxial growth of submicron complex oxide structures by amorphous SrTiO3

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