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A few-picosecond electrical pulse let researchers push two type-II superconductors past the current levels where ordinary direct-current measurements are often interrupted by moving vortices. NbN held up to a sharp threshold; YBCO weakened more gradually. The contrast may reflect their different superconducting gap structures, but two materials are not enough to establish a general rule.
Why a measured critical current may not be the material’s limit
In a type-II superconductor, magnetic flux can enter in the form of vortices: tiny regions around which the superconducting state is disrupted. When current drives those vortices to move, their motion can produce resistance and heat. A conventional direct-current (DC) measurement may therefore register a critical current before the superconducting material reaches its intrinsic microscopic limit.
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That intrinsic limit is called the depairing current: the current at which the superconducting state can no longer sustain its paired charge carriers, known as Cooper pairs. The distinction matters because a current threshold observed in a practical measurement can be set by vortex motion and heating rather than by the point at which pairing itself breaks down.
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The experiment was designed to apply current so briefly that vortices would have little time to travel and interfere with the measurement. The Max Planck Institute for the Structure and Dynamics of Matter report says vortices can move at tens of kilometers per second, or tens of nanometers in one picosecond. Those are explanatory figures reported by the institute, not independent measurements presented here.
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The setup uses photoconductive switches triggered by green laser pulses lasting 300 femtoseconds, at a wavelength of 515 nanometers. The switches generate electrical pulses lasting a few picoseconds. Those pulses travel through a coplanar waveguide to superconducting samples only a few micrometers in size. The researchers describe the strategy as outrunning vortex dynamics, not eliminating vortices from the material.
NbN and YBCO responded differently
The reported comparison found a sharp contrast as current increased:
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| Material | Gap structure described in the report | Response to rising ultrafast current |
|---|---|---|
| NbN | Relatively uniform s-wave gap | Remained superconducting until a clear threshold well above its conventional DC critical current, then changed sharply. The researchers interpret this abrupt response as evidence of Cooper-pair breaking. |
| YBCO | Direction-dependent d-wave gap, falling to zero along particular directions | Weakened progressively as current increased rather than showing the same sharp threshold response. |
The researchers suggest that the difference may be related to gap symmetry: a relatively uniform gap in NbN versus a direction-dependent gap in YBCO. This is a plausible interpretation of the two-material comparison, not proof that all s-wave and d-wave superconductors will behave this way.
What this result does—and does not—show
The experiment points to ultrafast transport as a way to probe microscopic behavior that ordinary DC transport does not directly reveal. The authors suggest it may provide access to properties such as gap symmetry. They also caution that more superconductors need to be tested to learn whether the relationship between gap structure and depairing response holds more broadly.
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The reported finding does not show that practical superconducting devices can carry more current, nor does it establish a ready-to-use technology. Possible relevance to optoelectronics and magnetic devices remains prospective. The accessible institute report gives no sample counts, numerical critical-current values, uncertainty estimates, or numerical effect sizes, so those details cannot be compared from that account.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Paper and report
The study is E. Wang, M. Chavez-Cervantes, J. Satapathy, T. Matsuyama, G. Meier, X. Zhang, L. You, F. Marijanovic, J. B. Curtis, E. Demler and A. Cavalleri, “Probing picosecond depairing currents in type-II superconductors,” Nature Physics, 24 September 2026. The experiment details summarized here are attributed to the Max Planck Institute for the Structure and Dynamics of Matter report dated 2 October 2026.
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