Progress in solution-based YBCO coated conductor

Li, Q.; Zhang, W.; Schoop, U.; Rupich, M.W.; Annavarapu, S.; Verebelyi, D. T.; Thieme, C.L.H.; Prunier, V.; Cui, X.; Teplitsky, M.; Fritzemeier, Les; Riley, G. N.; Paranthaman, M.; Goyal, A.; Lee, D.F.; Holesinger, T. G.

doi:10.1016/s0921-4534(01)00466-x

Cited by 32 publications

(12 citation statements)

References 3 publications

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“…Recently, long-length YBCO coated-conductor tapes with good superconductivity are commercially manufactured. This improvement was accomplished by using various vapor deposition methods and various novel substrate and buffer layers [1][2][3][4][5][6][7][8] . However, the potential for operation at elevated temperatures such as liquid nitrogen temperature and high magnetic fields is restricted.…”

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confidence: 99%

Effect of the proton irradiation on the thermally activated flux flow in superconducting SmBCO coated conductors

Choi

Ahmad

Seo

et al. 2020

Sci Rep

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We investigate changes in the vortex pinning mechanism caused by proton irradiation through the measurement of the in-plane electrical resistivity for H//c in a pristine and two proton-irradiated (total doses of 1 × 1015 and 1 × 1016 cm−2) SmBa2Cu3O7-δ (SmBCO) superconducting tapes. Even though proton irradiation has no effect on the critical temperature (Tc), the resulting artificial point defect causes an increase in normal state electrical resistivity. The electrical resistivity data around Tc shows no evidence of a phase transition to the vortex glass state but only broadens with increasing magnetic field due to the vortex depinning in the vortex liquid state. The vortex depinning is well interpreted by a thermally activated flux flow model in which the activation energy shows a nonlinear temperature change $${\boldsymbol{U}}{\boldsymbol{(}}{\boldsymbol{T}},{\boldsymbol{H}}{\boldsymbol{)}}{\boldsymbol{=}}{{\boldsymbol{U}}}_{{\boldsymbol{0}}}{\boldsymbol{(}}{\boldsymbol{H}}{\boldsymbol{)}}{{\boldsymbol{(}}{\bf{1}}-{\boldsymbol{T}}{\boldsymbol{/}}{{\boldsymbol{T}}}_{{\boldsymbol{c}}}{\boldsymbol{)}}}^{{\boldsymbol{q}}}$$U(T,H)=U0(H)(1−T/Tc)q (q = 2). The field dependence of activation energy shows a $${{\boldsymbol{U}}}_{{\bf{0}}}{\boldsymbol{ \sim }}{{\boldsymbol{H}}}^{-{\boldsymbol{\alpha }}}$$U0~H−α with larger exponents above 4 T. This field dependence is mainly due to correlated disorders in pristine sample and artificially created point defects in irradiated samples. Compared with the vortex pinning due to correlated disorders, the vortex pinning due to the appropriate amount of point defects reduces the magnitude of Uo(H) in the low magnetic field region and slowly reduces Uo(H) in high magnetic fields.

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confidence: 99%

Effect of the proton irradiation on the thermally activated flux flow in superconducting SmBCO coated conductors

Choi

Ahmad

Seo

et al. 2020

Sci Rep

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“…One interesting problem is to analyze the lowest value of parameter α under which fractional order dynamical systems show chaotic or hyperchaotic behaviors. Stability analysis, synchronization and control of fractional order systems by using different techniques are also widely investigated [6][7][8][9][10][11][12][13][14] and are of great interest due to their application in control theory, signal processing, complex networks, etc [15][16][17][18][19][20].…”

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confidence: 99%

Delayed feedback control of fractional-order chaotic systems

Gjurchinovski¹,

Sandev²,

Urumov³

2010

J. Phys. A: Math. Theor.

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We study the possibility to stabilize unstable steady states and unstable periodic orbits in chaotic fractional-order dynamical systems by the time-delayed feedback method. By performing a linear stability analysis, we establish the parameter ranges for successful stabilization of unstable equilibria in the plane parametrizad by the feedback gain and the time delay. An insight into the control mechanism is gained by analyzing the characteristic equation of the controlled system, showing that the control scheme fails to control unstable equilibria having an odd number of positive real eigenvalues. We demonstrate that the method can also stabilize unstable periodic orbits for a suitable choice of the feedback gain, providing that the time delay is chosen to coincide with the period of the target orbit. In addition, it is shown numerically that delayed feedback control with a sinusoidally modulated time delay significantly enlarges the stability region of the steady states in comparison to the classical time-delayed feedback scheme with a constant delay.

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“…Previous studies show that the surface resistance is strongly dependent on the alignment angle between the directions of the YBCO crystal's grain [21] and the applied magnetic field [19]. Moreover, directly forming a grain-aligned YBCO film on the deeply concaved inner surface of the cavities is prohibitively difficult because of the limitation in making the well textured buffer layers and substrate [22][23][24][25].…”

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confidence: 99%

Superconducting cavity in a high magnetic field

Ahn,

Kwon,

Chung

et al. 2020

Preprint

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A high Q-factor microwave resonator in a high magnetic field could be of great use in a wide range of applications, from accelerator design to axion dark matter research. The natural choice of material for the superconducting cavity to be placed in a high field is a high temperature superconductor (HTS) with high critical field (>100 T) and high depinning frequency (>10 GHz). The deposition, however, of a high-quality, grain-aligned HTS film on a three-dimensional surface is technically challenging. As a technical solution, we introduce a polygon-shaped resonant cavity with commercial YBa2Cu3O7−x (YBCO) tapes covering the entire inner wall. We then measured the Q-factor at 4 K at 6.93 GHz as a function of an external DC magnetic field. We demonstrated that the maximum Q-factor of the superconducting YBCO cavity was about 6 times higher than that of a copper cavity and showed no significant degradation up to 8 T. This is the first indication of the possible applications of HTS technology to the research areas requiring low loss in a strong magnetic field at high radio frequencies.

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Progress in solution-based YBCO coated conductor

Cited by 32 publications

References 3 publications

Effect of the proton irradiation on the thermally activated flux flow in superconducting SmBCO coated conductors

Effect of the proton irradiation on the thermally activated flux flow in superconducting SmBCO coated conductors

Delayed feedback control of fractional-order chaotic systems

Superconducting cavity in a high magnetic field

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