Plastic Vortex Creep in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>YBa</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi>Cu</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi>O</mml:mi></mml:mrow><mml:mrow><mml:mn>7</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>Crys

Abulafia, Y.; Shaulov, A.; Wolfus, Y.; Prozorov, Ruslan; Burlachkov, L.; Yeshurun, Y.; Majer, D.; Zeldov, E.; Wühl, H.; Geshkenbeǐn, V. B.; Vinokur, V. M.

doi:10.1103/physrevlett.77.1596

Cited by 328 publications

(306 citation statements)

References 20 publications

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“…As a result the magnetic curves are more regular. The overall behavior resembles the SMP observed usually in high-T c superconductors [4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19]. For this reason we "loosely" refer to these characteristic fields as H′′ smp ′′ .…”

Section: Tmis and The "Smp" In Magnetic Measurementsmentioning

confidence: 99%

“…This could indicate that in contrast to YBa 2 Cu 3 O 7+δ , in our case the "SMP" feature could originate from an anomalous relaxation process as the magnetic field increases. Soon after, Y. Abulafia et al [7] proposed that the anomalous behavior of S and U o could be ascribed to a change in the dynamic response of vortices at H * (T ) < H smp (T ). They proposed that for H < H * (T ) the response of vortex system was elastic, while for H > H * (T ) the increase of S (decrease of U o ) should be caused by plastic deformations of the vortex solid [7].…”

Section: Tmis and The "Smp" In Magnetic Measurementsmentioning

confidence: 99%

“…Soon after, Y. Abulafia et al [7] proposed that the anomalous behavior of S and U o could be ascribed to a change in the dynamic response of vortices at H * (T ) < H smp (T ). They proposed that for H < H * (T ) the response of vortex system was elastic, while for H > H * (T ) the increase of S (decrease of U o ) should be caused by plastic deformations of the vortex solid [7]. Since then, many experimental works confirmed this notion in YBa [4,6,10,11,18,19].…”

Section: Tmis and The "Smp" In Magnetic Measurementsmentioning

confidence: 99%

“…Recent magnetic studies in Nb films [1,2,3] reported the existence of a structure that reminisces of the second magnetization peak (SMP) which is usually observed in high-T c superconductors [4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19]. These studies concluded that for the case of Nb films the "SMP" is probably motivated by thermomagnetic instabilities (TMIs) that occur in the low-temperature regime, far below the uppercritical field [1,2,3].…”

Section: Introductionmentioning

confidence: 99%

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Relaxation measurements in the regime of the second magnetization peak in Nb films

Σταμόπουλος¹,

Niarchos²

2004

Physica C: Superconductivity

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We report on magnetic measurements as a function of field, temperature and time (relaxation) in superconducting Nb films of critical temperature Tc = 9.25 K. The magnetic measurements as a function of field exhibited a "second magnetization peak" ("SMP") which in general is accompanied by thermomagnetic instabilities (TMIs). The lines H′′ smp ′′ (T ) where the "SMP" occurs and the H fj (T ) where the first flux jump in the virgin magnetization curves is observed, end at a characteristic point (To, Ho) ≈ (7.2 K,80 Oe). Relaxation measurements showed that for T < To ≈ 7.2 K the activation energy Uo and the normalized relaxation rate S exhibit non-monotonic behavior as a function either of temperature or field. The extrema observed in Uo and S coincide with the points Hon(T ) or H′′ smp ′′ (T ) of the "SMP". In the regime T > To ≈ 7.2 K both Uo and S present a conventional monotonic behavior. These results indicate that the "SMP" behavior observed in our Nb films is promoted by the anomalous relaxation of the magnetization.

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Section: Tmis and The "Smp" In Magnetic Measurementsmentioning

confidence: 99%

Section: Tmis and The "Smp" In Magnetic Measurementsmentioning

confidence: 99%

Section: Tmis and The "Smp" In Magnetic Measurementsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Relaxation measurements in the regime of the second magnetization peak in Nb films

Σταμόπουλος¹,

Niarchos²

2004

Physica C: Superconductivity

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“…Theoretical models propose a similar dependence for H p , but with smaller exponent, i.e. α = 3/2 [5] for the transition to an amorphous solid, or α = 4/3 when above H p the system is in a strongly pinned liquid state (plastic flow) [20]. …”

Section: Resultsmentioning

confidence: 99%

Fish-Tail effect and irreversibility field of (Cu,C)Ba2Ca3Cu4O x -(LiF) y superconductor

et al. 2005

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Addition of (LiF) y≤0.15 , and of proper amount of (AgO) z=0.45-0.8 as oxidizing agent, to (Cu,C)Ba 2 Ca 3 Cu 4 O 10+δ superconductor is useful to control and to shift the doping characteristics (hole density and distribution, and level of disorder) into the region where the irreversible properties, i.e. fish-tail effect (FTE) and irreversibility field H irr are improved. Among notable effects are the development of the second magnetization peak with a higher amplitude J c, max and the enhancement of H irr at high temperatures, above a certain value T * which depends on both y LiF and z AgO . The best results are obtained for the sample with y LiF =0.1 and z AgO =0.73. This sample preserves its single phase Cu,C-1234 composition. The influence on the FTE and H irr of the interplay between doping characteristics, controlled by LiF and AgO content, is discussed.

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Vortex Dynamic Properties of Vortex-Liquid Phase in YBa2Cu3O7-? Epitaxial Films

Shan

Wang

et al. 2000

phys. stat. sol. (b)

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The current–voltage characteristics (CVC) of YBa2Cu3O7–δ epitaxial films were determined at temperatures and magnetic fields covering the vortex‐liquid region. Using functional fitting and scaling method, we derived the temperature and magnetic field dependences of the pinning potential U0(T,H) and critical current density Jc(T,H), and current, temperature and magnetic field dependences of the effective pinning potential Ueff(H,T,J) from the CVC. It is shown that the nonlinear resistance region of the vortex‐liquid phase displays a process from vortex plastic motion to free flow with the dynamic exponent changing from –0.5 to 0.

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Plastic Vortex Creep inYBa2Cu3O7−xCrys

Cited by 328 publications

References 20 publications

Relaxation measurements in the regime of the second magnetization peak in Nb films

Relaxation measurements in the regime of the second magnetization peak in Nb films

Fish-Tail effect and irreversibility field of (Cu,C)Ba2Ca3Cu4O x -(LiF) y superconductor

Vortex Dynamic Properties of Vortex-Liquid Phase in YBa2Cu3O7-? Epitaxial Films

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