Joule heating induced by vortex motion in a type-II superconductor

Xiao, Zhili; Andrei, E. Y.; Shuk, P.; Greenblatt, Martha

doi:10.1103/physrevb.64.094511

Cited by 11 publications

(4 citation statements)

References 28 publications

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“…Figure 6 shows a continuous variation of I C with R N for all the superconducting samples which supports our argument that the physics evolves continuously from the BKT to the PS regime, and that extraneous effects (such as electron heating [56,57]) do not perturb the data even for p p c  . In fact, as shown by the solid line in figure 6, the data are consistent with I R…”

Section: Critical Currentssupporting

confidence: 79%

“…The situation is complicated further in samples with low R N (e.g. Figure 4) which exhibit sharp hysteretic jumps to the normal state so that the transition from BKT to breakdown behaviour is shown more clearly in measurements using pulsed current excitation, which eliminate the heating effects responsible for hysteresis [55] near I C [56,57]. At lower currents, pulsed current measurements are consistent with the BKT and breakdown behaviour observed using DC currents.…”

Section: Critical Currentssupporting

confidence: 59%

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Quantum fluctuations in percolating superconductors: an evolution with effective dimensionality

et al. 2017

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We investigate percolating films of superconducting nanoparticles and observe an evolution from superconducting to metallic to insulating states as the surface coverage of the nanoparticles is decreased. We demonstrate that this evolution is correlated with a reduction in the effective/dominant dimensionality of the system, from 2D to 1D to 0D, and that the physics in each regime is dominated by vortices, phase slips and tunnelling respectively. Finally we construct phase diagrams that map the various observed states as a function of surface coverage (or, equivalently, normal state resistance), temperature and measurement current.

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Section: Critical Currentssupporting

confidence: 79%

Section: Critical Currentssupporting

confidence: 59%

Quantum fluctuations in percolating superconductors: an evolution with effective dimensionality

et al. 2017

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“…The curves all collapse onto a single curve, as shown in Fig. 3(c) , which cannot be explained by the depairing current density ( J d ) given by J d ( t ) ∝ (1 − t 2 ) 3/2 (1 + t 2 ) 1/2 (dashed line) 18 , nor by the Joule heating, J heating (Δ T ∝ J 2 ) which is caused by the contact resistance (dotted line) 19 . Rather, they collapse onto the curve expected from the δT c -pinning mechanism (solid line), J f ( t ) ∝ (1 − t 2 ) 7/6 (1 + t 2 ) 5/6 , suggesting that the temperature dependence of the FFF current density is primarily determined by spatial variations in T c (refs 20 , 21 ).…”

Section: Discussionmentioning

confidence: 95%

Enhanced critical current density in the pressure-induced magnetic state of the high-temperature superconductor FeSe

Jung

Kang

Park

et al. 2015

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We investigate the relation of the critical current density (Jc) and the remarkably increased superconducting transition temperature (Tc) for the FeSe single crystals under pressures up to 2.43 GPa, where the Tc is increased by ~8 K/GPa. The critical current density corresponding to the free flux flow is monotonically enhanced by pressure which is due to the increase in Tc, whereas the depinning critical current density at which the vortex starts to move is more influenced by the pressure-induced magnetic state compared to the increase of Tc. Unlike other high-Tc superconductors, FeSe is not magnetic, but superconducting at ambient pressure. Above a critical pressure where magnetic state is induced and coexists with superconductivity, the depinning Jc abruptly increases even though the increase of the zero-resistivity Tc is negligible, directly indicating that the flux pinning property compared to the Tc enhancement is a more crucial factor for an achievement of a large Jc. In addition, the sharp increase in Jc in the coexisting superconducting phase of FeSe demonstrates that vortices can be effectively trapped by the competing antiferromagnetic order, even though its antagonistic nature against superconductivity is well documented. These results provide new guidance toward technological applications of high-temperature superconductors.

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“…Each point is obtained on a pristine vortex lattice freshly prepared from the normal state. It was previously shown that for samples and mounting methods identical to the ones used here Joule heating effects on time scales < 10 µs are negligible 13 . In addition to avoiding heating, the pulsed technique also eliminates effects due to current induced organization as we show below.…”

mentioning

confidence: 86%