Multilayering and Ag-Doping for Properties and Performance Enhancement in ${\hbox{YBa}}_{2}{\hbox{Cu}}_{3}{\hbox{O}}_{7}$ Films

Pan, Alexey V.; Pysarenko, Serhiy; Wexler, David; Rubanov, S.; Dou, Shi Xue

doi:10.1109/tasc.2007.899033

Cited by 40 publications

(53 citation statements)

References 15 publications

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“…Quasi-single-crystal c-oriented YBCO thin films were produced on 5 × 5 mm size SrTiO 3 (STO) substrates using standard pulsed-laser deposition (PLD) 33,35 . Deposition was performed by KrF excimer laser with the wave-length of 248 nm.…”

Section: A Pld Of Ybco and Fept Thin Filmsmentioning

confidence: 99%

“…The films where annealed in oxygen atmosphere at 400 • C for one hour after deposition for oxygenation. The thin films measured in this work are of optimal thickness d p 300 nm thick 5,6,33 , measured by Dektak profiler. The critical temperature was T c 90.0 ± 0.5 K for films deposited with 5 Hz and 8 Hz frequencies and T c 91.5 ± 0.5 K for 1 Hz deposited film, measured by DC magnetic measurements in PPMS at B a = 2.5 mT.…”

Section: A Pld Of Ybco and Fept Thin Filmsmentioning

confidence: 99%

“…The YBCO PLD films of the optimal thickness with the highest J c (B a ) are usually associated with rather advanced island structure 61-63 with pronounced topology and rather high surface roughness 6,33 (unless special techniques are employed to reduce it 33,35 ). The developed structure and its corresponding topography hinder the study of the island growth and structure.…”

Section: B Ybco Thin Filmsmentioning

confidence: 99%

“…Furthermore, a critical thickness for the optimal YBCO performance exists 5,6,33,34 . In thicker films, the surface becomes rough and their properties degrade, unless a multilayered structure is introduced 35 .…”

Section: Introductionmentioning

confidence: 99%

“…In thinner films, the integral capabilities of the films are reduced. The optimal thickness, defined at the maximum of the critical current density (J c ) as the function of the film thickness 5,33 , is usually obtained at the deposition stage with all YBCO islands coalesced 5,6,34 . In this work, it is shown that the island density and the island growth kinetics can be effectively varied by changing deposition conditions (in particular, laser frequency), thus the optimal thickness can be adjusted at will.…”

Section: Introductionmentioning

confidence: 99%

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Significant tunability of thin film functionalities enabled by manipulating magnetic and structural nano-domains

Golovchanskiy

Pan

Fedoseev

et al. 2014

Applied Surface Science

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The influence of laser frequency on the structure and physical properties of thin films grown by pulsed laser deposition has been studied. Different types of thin films, hard ferromagnetic FePt L10 and quasi-single crystal superconducting YBa2Cu3O7 (YBCO), have been used for demonstration of the effect. Significant structural modifications have been obtained for the films with similar thicknesses. These modifications are shown to dramatically control their corresponding properties, providing an instrumental ability for tuning the practical characteristics of the films by changing the laser frequency of their deposition. In particular, 20-fold increase of coercive field and modification of demagnetization mechanism are obtained for FePt films by varying the frequency from 1 Hz to 6 Hz. Over a similar frequency range, a strong dependence on the laser frequency is discovered for the YBCO films for the critical current density behavior as a function of the applied magnetic field [ Jc(Ba)] with the unexpected reversal of Jc(Ba) curves with temperature. The mechanisms of structure modifications and corresponding property variations are proposed. The influence of laser frequency on the structure and physical properties of thin films grown by pulsed laser deposition has been studied. Different types of thin films, hard ferromagnetic FePt L10 and quasi-single crystal superconducting YBa2Cu3O7 (YBCO), have been used for demonstration of the effect. Significant structural modifications have been obtained for the films with similar thicknesses. These modifications are shown to dramatically control their corresponding properties, providing an instrumental ability for tuning the practical characteristics of the films by changing the laser frequency of their deposition. In particular, 20-fold increase of coercive field and modification of demagnetization mechanism are obtained for FePt films by varying the frequency from 1 Hz to 6 Hz. Over a similar frequency range, a strong dependence on the laser frequency is discovered for the YBCO films for the critical current density behaviour as a function of the applied magnetic field [Jc(Ba)] with the unexpected reversal of Jc(Ba) curves with temperature. The mechanisms of structure modifications and corresponding property variations are proposed.

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Section: A Pld Of Ybco and Fept Thin Filmsmentioning

confidence: 99%

Section: A Pld Of Ybco and Fept Thin Filmsmentioning

confidence: 99%

Section: B Ybco Thin Filmsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Significant tunability of thin film functionalities enabled by manipulating magnetic and structural nano-domains

Golovchanskiy

Pan

Fedoseev

et al. 2014

Applied Surface Science

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Enhancing Properties of High‐Temperature Superconducting Step‐Edge Josephson Junctions by Nano‐Multilayers with a Small Mismatch

Pan

Shcherbakova

Fedoseev

et al. 2014

Adv Materials Inter

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activated motion in these superconducting structures. [ 6 ] One of the approaches to minimize the 1/f noise caused by vortex motion is improvement of pinning properties and, hence, the critical current density ( J c ) of the superconducting fi lm. Recently, the noise performance of HTS SQUID has been improved in a magnetic environment by using YBCO fi lm with a large thickness and high J c value. [ 8 ] We have also demonstrated that fi lms with better structural integrity (smooth, no holes) minimize fl ux creep and vortex hopping in alternating magnetic fi elds and have lower 1/f noise. [ 9 ] Thus, the materials technology needs for qubits are similar to the requirements of SQUID applications, also having Josephson junctions as their basic element. High quality YBCO Josephson junctions play a key-role in the successful implementation of HTS superconducting circuits at 77 K. [ 6 ] This is mainly due to YBCO material properties, resulting from the complexity of structural characteristics and having strong infl uence on the transport properties of YBCO. [ 10 ] A range of different types of YBCO junctions have been engineered. [ 10 ] Among them, stepedge junctions are singled out due to their low cost, relatively high characteristic voltage (the so-called I R c n value of 100 to 400 μV at 77 K, [ 7,11 ] where I c is the critical current and R n is the resistance in the normal state), and excellent integrability and the scalability of the junctions. These features enable miniaturization and high effi ciency of electronic circuits, as well as applications in magnetic sensing and terahertz (THz) imaging. [ 12,13 ] Therefore, the combined enhancement of fl ux pinning, critical current and microstructure in the YBCO junctions is a crucial task for obtaining tailored junction properties towards the well-defi ned requirements. [ 1 ] In this work, we demonstrate a new straightforward, but effective multilayering approach for fabrication of HTS step-edge junctions with signifi cantly enhanced characteristics. The alternation of main YBCO and intermediate NdBa 2 Cu 3 O 7 (NdBCO) superconducting layers was shown to dramatically improve surface morphology of 1 μm thick fi lms. [ 14 ] Furthermore, this architecture resulted in considerable enhancement of fl ux pinning and current-carrying ability over a wide range of magnetic fi elds and temperatures. We have successfully managed to apply this technology to YBCO step-edge junctions and to demonstrate signifi cant enhancement of transport and structural properties in these junctions. This approach is preferred over the fabrication of thick fi lm, [ 8 ] because it enables structural tailoring with simultaneous adjustment of transport properties required for junction performance. Thus, the multilayered deposition is offering a new promising approach for applications in HTS-based electronics.Recent signifi cant progress in superconducting qubits (based on Josephson junctions) has achieved coherence times approaching to the practically required for quantum computers. [ 1 ] At the same...

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Tunable pinning effects produced by non‐uniform antidot arrays in YBCO thin films

et al. 2017

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Uniform, graded and spaced arrays of 3 μm triangular antidots in pulsed laser deposited YBa 2 Cu 3 O 7 (YBCO) superconducting thin films are compared by examining the improvements in the critical current density J c they produced. The comparison is made to establish the role of their lithographically defined (non-)uniformity and the effectiveness to control and/or enhance the critical current density. It is found that almost all types of non-uniform arrays, including graded ones enhance J c over the broad applied magnetic field and temperature range due to the modified critical state. Whereas uniform arrays of antidots either reduce or produce no effect on J c compared to the original (asdeposited) thin films.

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Multilayering and Ag-Doping for Properties and Performance Enhancement in ${\hbox{YBa}}_{2}{\hbox{Cu}}_{3}{\hbox{O}}_{7}$ Films

Cited by 40 publications

References 15 publications

Significant tunability of thin film functionalities enabled by manipulating magnetic and structural nano-domains

Significant tunability of thin film functionalities enabled by manipulating magnetic and structural nano-domains

Enhancing Properties of High‐Temperature Superconducting Step‐Edge Josephson Junctions by Nano‐Multilayers with a Small Mismatch

Tunable pinning effects produced by non‐uniform antidot arrays in YBCO thin films

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