Phase diagram of flux creep in melt-textured and single-crystalline<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">YBa</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Cu</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow>

Küpfer, H.; Gordeev, S.N.; Jahn, Wolfgang; Kresse, R.; Meier‐Hirmer, R.; Wolf, Th.; Zhukov, A.A.; Saláma, K.; Lee, D

doi:10.1103/physrevb.50.7016

Cited by 56 publications

(21 citation statements)

References 23 publications

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“…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]. More specifically, in high-T c compounds for fields H > H * (T ) the activation energy U o follows a negative power-law U o ∝ H ν with ν ∈ [−0.5, −0.9] [7,10,13,18,19].…”

Section: Tmis and The "Smp" In Magnetic Measurementsmentioning

confidence: 50%

“…In the experiments of Ref. 4 the minimum in S (maximum in U o ) was observed at a characteristic field H * (T ), placed well below the maximum point H smp (T ) of the SMP. As a result the relaxation ori- gin of the SMP in YBa 2 Cu 3 O 7+δ single crystals remained a doubtful possibility.…”

Section: Tmis and The "Smp" In Magnetic Measurementsmentioning

confidence: 99%

“…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%

“…The appearance of these extrema in U o (and also in S) means that there is an enhancement of the effective pinning in the regime of the "SMP". In a recent article H. Kupfer et al [4] discussed relaxation as a possible origin of the SMP in YBa 2 Cu 3 O 7+δ single crystals. They proposed that the SMP could originate from a crossover between different relaxation mechanisms.…”

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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