Ultrasonic Observation of Magnetization and Flux Jumping in a Superconducting Nb-Zr Alloy

Claiborne, L.T.; Einspruch, Norman G.

doi:10.1063/1.1708290

Cited by 4 publications

(8 citation statements)

References 14 publications

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“…The time dependence of the magnetization, voltage, temperature, ultrasonic attenuation, and other characteristics of the sample 'were determined in the course of the experiments. In some papers, several quantities were measured simultaneously (Claiborne and Einspruch, 1966;Neuringer and Shapira, 1966). Various measuring techniques were used.…”

Section: A General Commentsmentioning

confidence: 99%

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Critical state stability in type-II superconductors and superconducting-normal-metal composites

1981

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Section: A General Commentsmentioning

confidence: 99%

“…"Shown in Fig. 16 are characteristic time dependences for the aforementioned quantities, taken from the literature [Claiborne and Einspruch, 1966, Fig. 16(a); Neuringer and Shapira, 1966, Fig.…”

Section: A General Commentsmentioning

confidence: 99%

Critical state stability in type-II superconductors and superconducting-normal-metal composites

1981

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“…Temperature jumps were detected in Nb-Zr alloys [4]. MgB 2 films coated with gold showed suppression of the dendritic avalanches [27].…”

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“…Large jumps in magnetization, temperature, ultrasonic attenuation and resistivity have been observed in many superconducting materials since early 60s [1,2,3,4,5,6]. Although no definitive mechanism has been identified, it is believed that such changes are caused by sudden redistribution of Abrikosov vortices triggered and supported by thermomagnetic instabilities [1,2,3,7,8,9,10,11,12].…”

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confidence: 99%

“…tures up to 5.5 K. Evidently, variation of magnetization at a jump is much larger in a thick sample. Visualization of the magnetic induction, B (r), on the sample surface was performed in a flow-type 4 He cryostat with the sample in vacuum attached to a copper heat exchanger (i.e., cooling conditions are different from measurements in QD MPMS, Fig.1). Bismuth-doped irongarnet heterostructure film with in-plane magnetization was used as a magneto-optical indicator [23,24].…”

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Collapse of the critical state in superconducting niobium

2006

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Giant abrupt changes in the magnetic flux distribution in niobium foils were studied by using magneto-optical visualization, thermal and magnetic measurements. Uniform flux jumps and sometimes almost total catastrophic collapse of the critical state are reported. Results are discussed in terms of thermomagnetic instability mechanism with different development scenarios.Comment: arXiv.org produced artifacts in color images (three versions were attempts to make better images). Download clean PDF and watch video-figures at: "http://cmp.ameslab.gov/supermaglab/video/Nb.html

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Internal-Friction and Young's-Modulus Variations in the Superconducting, Mixed, and Normal States of Niobium

Krämer¹,

Bauer²

1967

Phys. Rev.

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Internal-friction and Young's-modulus measurements have been performed on as-grown and deformed niobium single crystals as a function of temperature and external magnetic field. The crystals are driven in longitudinal resonance between 1.5 and 10°K at 80 and 240 kHz. An internal-friction relaxation peak is observed at 3.24°K in the superconducting state, but shifts abruptly to 2.08°K when the mixed state is established. This peak is characterized by a single relaxation time r, defined by the expression r=ro exp(£/^r). The activation energy E and the attempt frequency TO -1 , respectively, are 0.0019 eV and 6X10 8 rad/sec in the superconducting state, and 0.0016 eV and 4X10 9 rad/sec in the normal state (k is Boltzmann's constant and T denotes the absolute temperature). Effects of plastic deformation and residualimpurity content suggest that the relaxation process involves the motion of dislocations, modified by the presence of residual chemical impurities. Based on this premise, the interaction between dislocations and magnetic fluxoids is inferred to be attractive. Young's modulus also reflects the relaxation, and, in addition, decreases with decreasing temperature below 4°K. This decrease, however, is not consistent with ordinary relaxation mechanisms.

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Ultrasonic Observation of Magnetization and Flux Jumping in a Superconducting Nb-Zr Alloy

Cited by 4 publications

References 14 publications

Critical state stability in type-II superconductors and superconducting-normal-metal composites

Critical state stability in type-II superconductors and superconducting-normal-metal composites

Collapse of the critical state in superconducting niobium

Internal-Friction and Young's-Modulus Variations in the Superconducting, Mixed, and Normal States of Niobium

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