EFFECT OF FAST-NEUTRON-INDUCED DEFECTS ON THE CURRENT CARRYING BEHAVIOR OF SUPERCONDUCTING Nb3Sn

Cullen, G. W.; Novak, R. L.

doi:10.1063/1.1754006

Cited by 41 publications

(19 citation statements)

References 7 publications

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“…Namely, an electric field, and, correspondingly, dissipation appears along the field/current direction [4][5][6][7][8][9][10][11][12][13][14][15][16]. Moreover, the superconducting critical current appears to increase with the magnetic field [4][5][6][7][8]15]. Surprisingly, an instantaneous electric field opposite to the field/current direction was reported [9,11,12,16].…”

Section: Sample Configurationmentioning

confidence: 97%

“…However, previous experiments on superconductors in parallel magnetic fields are still controversial. Namely, an electric field, and, correspondingly, dissipation appears along the field/current direction [4][5][6][7][8][9][10][11][12][13][14][15][16]. Moreover, the superconducting critical current appears to increase with the magnetic field [4][5][6][7][8]15].…”

Section: Sample Configurationmentioning

confidence: 99%

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Parallel magnetic field suppresses dissipation in superconducting nanostrips

Wang

Glatz

Kimmel

et al. 2017

Proc. Natl. Acad. Sci. U.S.A.

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The motion of Abrikosov vortices in type-II superconductors results in a finite resistance in the presence of an applied electric current. Elimination or reduction of the resistance via immobilization of vortices is the "holy grail" of superconductivity research. Common wisdom dictates that an increase in the magnetic field escalates the loss of energy since the number of vortices increases. Here we show that this is no longer true if the magnetic field and the current are applied parallel to each other. Our experimental studies on the resistive behavior of a superconducting Mo0.79Ge0.21 nanostrip reveal the emergence of a dissipative state with increasing magnetic field, followed by a pronounced resistance drop, signifying a re-entrance to the superconducting state. Large-scale simulations of the threedimensional time-dependent Ginzburg-Landau model indicate that the intermediate resistive state is due to an unwinding of twisted vortices. When the magnetic field increases, this instability is suppressed due to a better accommodation of the vortex lattice to the pinning configuration. Our findings show that magnetic field and geometrical confinement can suppress the dissipation induced by vortex motion and thus radically improve the performance of superconducting materials.superconducting vortices parallel magnetic field Time-dependent GinzburgLandau simulation Abbreviations: TDGL simulation:Time-Dependent Ginzburg-Landau simulation ortex dynamics determines the electromagnetic responses of almost all practically important superconductors. Abrikosov vortices are created by the magnetic field penetrating a type-II superconductor, each carrying a single flux quantum surrounded by circulating supercurrents [1]. Understanding the electromagnetic properties of superconductors in applied magnetic fields is crucial for the majority of superconducting applications. If an electric current, I, is applied to the superconductor with a magnetic induction B, the associated Lorentz force FL = I B can induce motion of the vortices if it is greater than the vortex pinning force due to defects.[2] The vortex motion in turn leads to dissipation and breakdown of the zero-resistance state. Another practically important situation is when the magnetic field and the current are parallel, for example in force-free superconductnomena, [13,[17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32] including flux cutting [19,30,33,34], helical normal/superconducting domains, [35,36] and helical vortex flow. [13,31] However, the vortex behavior responsible for the observed dissipation in parallel magnetic field is still under debate [14,28,30,31].All the above mentioned experiments and theories focus on macroscopic samples with dimensions much larger than the superconducting coherence length. On the other hand, when the dimensions of the sample become comparable to the superconducting coherence length, the subtle interplay of vortex lattice confinement and pinning may lead to new behavior. Here, we investigate this non-trivial problem...

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Section: Sample Configurationmentioning

confidence: 97%

Section: Sample Configurationmentioning

confidence: 99%

Parallel magnetic field suppresses dissipation in superconducting nanostrips

Wang

Glatz

Kimmel

et al. 2017

Proc. Natl. Acad. Sci. U.S.A.

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show abstract

“…Fig. 2 Critical current of a superconducting Nb 3 Sn tape in transverse (open symbols) and longitudinal magnetic fields (solid symbols) at 4.2 K5) . The enhancement of critical current in each field direction is caused by introduction of the pinning centers via neutron irradiation.…”

mentioning

confidence: 99%

“…Fig 5. Longitudinal potential difference versus current at various positions along the length of the superconducting Pb-Tl wire9) .…”

mentioning

confidence: 99%

Superconducting Phenomena and Electromagnetism III

Matsushit¹

2011

TEION KOGAKU

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“…The largest merit of application of the so-called longitudinal magnetic field effect is a dramatic enhancement of the critical current density of superconductors in a parallel magnetic field [1][2][3][4]. The authors proposed to apply this effect to superconducting DC power cables, since it promises to bring about a significant enhancement of currentcarrying capacity in comparison with conventional superconducting cables [5].…”

Section: Introductionmentioning

confidence: 99%