The Influence of the Sample Shape on the Flux Jumps Dynamics in Conventional NbTi Superconductor

Piechota, S.; Szymczak, H.; Vasiliev, S.; Chabanenko, V. V.; Rusakov, V. F.

doi:10.12693/aphyspola.114.235

Cited by 2 publications

(2 citation statements)

References 10 publications

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“…Figures 2(a The width of the region of instability in the magnetic field increased from µ 0 H 1 tFJ = 2 T in the disc to µ 0 H 1 tFJ = 3.1 T in the ring. The average period between avalanches on the hysteresis loop decreased more than five times from ∆B ext = 0.26 T to ∆B ext = 0.05 T. At a temperature of 2 K for a superconducting ring, the instability region is ∼±7.5 T, which is much wider than that of a superconducting disc [27,28], where it is ∼±5.7 T. A change in the sign of the magnetization on the M(B ext ) loop as a result of the avalanche jump of the magnetic flux was observed for the ring (see the inset in the lower left corner of figure 2(c)). This phenomenon has been experimentally observed in superconducting film rings [29] and cylinders [30], and is associated with a change in the sign of the local surface self-field of a conventional NbTi superconductor [17].…”

Section: Dynamics Of the Magnetic Flux: Ring And Discmentioning

confidence: 90%

Avalanche dynamics of magnetic flux in the Nb-Ti superconducting ring

Chabanenko¹,

Puźniak²,

Rusakov³

2023

Supercond. Sci. Technol.

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We report observations of the spatial and temporal variations in ﬂux penetration into doubly connected bulk superconductors (hollow cylinder, ring) and discs (singly connected) in thermomagnetic avalanches. Dramatic changes were established in the stability of the critical state of the disc when it was transformed into a ring: the region of instability in the magnetic field in the ring doubled, and the number of thermomagnetic avalanches increased from nine to 60. The duration of flux jump, the amount of flux entering the sample, and its dependence on the magnetic field changed significantly, and the weak linear field dependence in the disc was inversely proportional to the magnetic field in the ring. A complicated ﬁne structure of magnetic ﬂux penetrating the ring hole was detected. It was experimentally determined that the speed of the avalanche flux front throughout the sample increased sharply when magnetic flux appeared in the hole. This study also presents other aspects of the dynamic response of a superconducting ring that are discussed in detail.

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Section: Dynamics Of the Magnetic Flux: Ring And Discmentioning

confidence: 90%

Avalanche dynamics of magnetic flux in the Nb-Ti superconducting ring

Chabanenko¹,

Puźniak²,

Rusakov³

2023

Supercond. Sci. Technol.

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“…In our experimental works [9,10] we studied the dynamics of flux jumps in NbTi disk and cylinder. We analyzed the duration of the following flux jumps as a function of the external magnetic field.…”

Section: Discussionmentioning

confidence: 99%

The Influence of the Magnetic Field on the Dynamics of the Flux Jumps in the Flux Flow Model

et al. 2010

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We studied the dynamics of the flux jumps in type II superconductors assuming this dynamics to be determined by magnetic diffusion. The conductivity of the sample during the jump was described by the flux flow conductivity, which depends on local magnetic field. We solved this problem numerically for an infinite slab sample. We assumed that superconducting sample was fully penetrated by the magnetic flux at the beginning and that the local induction of the magnetic field, in the whole sample, was equal to B 0 . Then, the external magnetic field was increased by a value of ∆B a and in the external magnetic field of B 0 + ∆B a flux jump occurred. In our simulations we used the parameters characteristic of a conventional NbTi superconductor at 4.2 K. In particular, we studied the influence of the parameter B 0 on the flux jumps' dynamics. We have found that this parameter strongly influences initial stage of the diffusion process. With increasing B 0 , the time during which flux front of the avalanche reaches the center of the sample decreases. The results of numerical simulations were compared with experiments.

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The Influence of the Sample Shape on the Flux Jumps Dynamics in Conventional NbTi Superconductor

Cited by 2 publications

References 10 publications

Avalanche dynamics of magnetic flux in the Nb-Ti superconducting ring

Avalanche dynamics of magnetic flux in the Nb-Ti superconducting ring

The Influence of the Magnetic Field on the Dynamics of the Flux Jumps in the Flux Flow Model

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