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Chaotic dynamics of falling disks

The study of the motion of flat bodies falling in a viscous mediumdates back at least to Newton and Maxwell, and is relevant to problems in meteorology, sedimentology, aerospace engineering and…
Springer Nature (opens in a new tab)

Superconducting vortex avalanches.

The observed distribution of vortex avalanche sizes shows a power-law behavior over two decades, proving that the vortex dynamics in the Bean state is characterized by avalanches of many length scales.
PubMed (opens in a new tab)

Critical field for complete vortex expulsion from narrow superconducting strips.

The small value of the critical field, which is orders of magnitude less than in the bulk, implies that superconducting devices should be designed with narrow wires to eliminate the generation of noise from vortex motion.
PubMed (opens in a new tab)

MAGNETIC CORRELATIONS, GEOMETRICAL FRUSTRATION, AND TUNABLE DISORDER IN ARRAYS OF SUPERCONDUCTING RINGS

A superconducting ring, biased in an external flux ${\mathrm{\ensuremath{\Phi}}}_{0}$/2, can be in either of two energetically degenerate fluxoid states. In one state, the supercurrent flows in a…
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Equilibrium configurations of Pearl vortices in narrow strips

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Compact large‐range cryogenic scanner

We describe the construction and operation of a large‐range piezoelectric scanner, suitable for various scanning probe microscopies such as magnetic force, atomic force, and Hall probe microscopies.…
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Flux pinning mechanisms in ErNi 2 B 2 C

We present local Hall probe measurements of the superconducting and magnetically ordered material ${\mathrm{ErNi}}_{2}{\mathrm{B}}_{2}\mathrm{C}$ ${(T}_{c}\ensuremath{\simeq}10.5 \mathrm{K},$…
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Capacitive position sensor with simultaneous, linear X-Y readout

A design is presented for a compact capacitive position sensor suitable for operation at cryogenic temperatures and high magnetic fields. The four quadrants of a base electrode are excited with…
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Critical behavior of the Hall conductivity at the metal-insulator transition.

The low-temperature longitudinal and Hall conductivities in a series of Ge:Sb samples at the approach to the metal-insulator transition critically vanish with the same exponent of 1, in contradiction to the ratio of 2 predicted by the scaling theory of localization.
PubMed (opens in a new tab)

Plastic flow, voltage noise and vortex avalanches in superconductors

Abstract We use large-scale parallel simulations to compute the motion of superconducting magnetic vortices during avalanches triggered by small field increases. We relate observations of pulsing…
arXiv (opens in a new tab)
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