Thickness dependence of magnetic relaxation and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>E</mml:mi></mml:math>-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>J</mml:mi></mml:math>characteristics in superconducting (Gd-Y)-Ba-Cu-O films with strong vortex pinning

Polat, Özgür; Sinclair, John; Zuev, Yuri L.; Thompson, James R.; Christen, D. K.; Cook, Stephen J.; Kumar, Dhananjay; Chen, Y; Selvamanickam, V.

doi:10.1103/physrevb.84.024519

Cited by 64 publications

(64 citation statements)

References 61 publications

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“…To evaluate the low-T behavior of the j c , we use magnetooptical method of the visualization of magnetic ux penetration into the lm. These measurements show that the j c increases linearly with decreasing T down to 4 K. The linear dependence of j c on T suggests a presence of strong pinning by correlated defects, rather than the weak col-lective pinning, which would produce exponential decay of the j c with increasing T [11,12].…”

Section: Resultsmentioning

confidence: 79%

“…Instead, the peaks near ab plane are commonly observed in thin lms of YBCO. They indicate strong pinning by correlated disorder due to layering near ab plane of second-phase precipitates, stacking faults or intergrowths [12,14]. This conclusion does not mean that the buer-related defects do not play any role, only that they do not introduce any correlated disorder away from ab plane.…”

Section: Resultsmentioning

confidence: 96%

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Growth and Characterization of YBa_2Cu_3O_{7-δ} Films Deposited by Laser Ablation on CeO_2-Buffered Sapphire

et al. 2014

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In this work we study the growth, by pulsed laser deposition, of YBa2Cu3O 7−δ (YBCO) lms on the CeO2--buered R-cut sapphire substrates, with the buer layer recrystallized prior to the deposition of superconductor. We nd that the superconducting critical temperature and the critical current density of the lms are very close to similar parameters for the YBCO lms grown on lattice-matched single crystalline substrates. It appears that the structural defects in the buer layer aect the microstructure of YBCO lms, resulting in high values of the critical current density, suitable for applications.

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Section: Resultsmentioning

confidence: 79%

Section: Resultsmentioning

confidence: 96%

Growth and Characterization of YBa_2Cu_3O_{7-δ} Films Deposited by Laser Ablation on CeO_2-Buffered Sapphire

et al. 2014

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“…Note that the so-defined B * irr is well suitable for fitting J c (B a ) curves in YBCO films as shown in Ref. [19,31] or for fitting pinning force through Kramer plots [48,49,50]. In Fig.…”

Section: Vibration Effect Influence On the Irreversibility Fieldmentioning

confidence: 95%

“…10 K. At T = 10 K, B a was applied up to 10 T with no visible effect of vibrations was detected. However, at this temperature it was not possible even to approach to B irr of YBCO thin films, because at T = 10 K it can reach up to ∼ 100 T [31,19,32]. According to Fig.…”

Section: Methodsmentioning

confidence: 99%

“…1) in particular at B a > 1 T and f > 1 Hz, the behaviour becomes quite complex. Quantitative models for J c (B a ) that employ B irr for fitting J c (B a ) curves [19,31] or pinning force through Kramer plots in YBCO [48,49,50] and MgB 2 [51,52] do not take into account vibrations, and hence cannot explain the kinks in the J c (B a ) behaviour nor the B irr variations.…”

Section: Vibration Effect Influence On the Irreversibility Fieldmentioning

confidence: 99%

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Vibration effect on magnetization and critical current density of superconductors

Golovchanskiy¹,

Pan²,

George³

et al. 2016

Supercond. Sci. Technol.

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. (2016). Vibration effect on magnetization and critical current density of superconductors. Superconductor Science and Technology, 29 075002-1-075002-12. Vibration effect on magnetization and critical current density of superconductors AbstractIn this work the effect of vibrations on critical current density ( Jc) of superconductors has been studied. The vibrations are shown to affect Jc of all types of superconductors during their measurements, employing a vibrating sample magnetometer (VSM). Increasing vibration frequency ( f ) and/or amplitude (A) leads to progressive reduction of Jc as a function of magnetic field (Ba). The effect of vibrations is substantially stronger in thin films. It leads to development of unexpected kinks on Jc (Ba) curves. Analysis of magnetization loops and relaxation of magnetization in YBCO films revealed that the vibration effect can be treated as the effective reduction of pinning potential. The asymmetry of the vibration effect in ascending and descending Ba is observed, indicating differences in free energy of the corresponding vortex structures. Thermal effects induced by vibrations with large f and A are shown to have rather insignificant influence, while the vibrational vortex dynamics exhibit a strong impact. The irreversibility field (Birr) is shown to be instrumentally defined, and its value depends on VSM settings. In addition, the practical importance of Birr for Jc modeling is demonstrated. Abstract.In this work the effect of vibrations on critical current density (Jc) of superconductors has been studied. The vibrations are shown to affect Jc of all types of superconductors during their measurements, employing Vibrating Sample Magnetometer (VSM). Increasing vibration frequency (f ) and/or amplitude (A) lead to progressive reduction of Jc as a function of magnetic field (Ba). The effect of vibrations is substantially stronger in thin films. It leads to development of unexpected kinks on Jc(Ba) curves. Analysis of magnetization loops and relaxation of magnetization in YBCO films revealed that the vibration effect can be treated as the effective reduction of pinning potential. The asymmetry of the vibration effect in ascending and descending Ba is observed, indicating differences in free energy of the corresponding vortex structures. Thermal effects induced by vibrations with large f and A is shown to have rather insignificant influence, while the vibrational vortex dynamics exhibits a strong impact. The irreversibility field (B irr ) is shown to be instrumentally defined, and its value depends on VSM settings. In addition, the practical importance of B irr for Jc modeling is demonstrated.Vibration effect on magnetization and critical current density of superconductors 2

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Thickness-Dependent Properties of YBCO Films Grown on GZO/CLO-Buffered NiW Substrates

et al. 2016

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Thickness dependence of magnetic relaxation andE-Jcharacteristics in superconducting (Gd-Y)-Ba-Cu-O films with strong vortex pinning

Cited by 64 publications

References 61 publications

Growth and Characterization of YBa_2Cu_3O_{7-δ} Films Deposited by Laser Ablation on CeO_2-Buffered Sapphire

Growth and Characterization of YBa_2Cu_3O_{7-δ} Films Deposited by Laser Ablation on CeO_2-Buffered Sapphire

Vibration effect on magnetization and critical current density of superconductors

Thickness-Dependent Properties of YBCO Films Grown on GZO/CLO-Buffered NiW Substrates

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