5 ms·

Some literature suggests its a "one dimensiononal" superconductor only kinda works in tiny monocrystaline grains. ...But maybe thats even more interesting for,

Some literature suggests its a "one dimensiononal" superconductor only kinda works in tiny monocrystaline grains. ...But maybe thats even more interesting for, say, microelectronics? Especially if the resistance orthogonal to the superconductivity is high, if such a thing is even possible?

ThrowawayTestr 3y ago
Zero loss diodes seem pretty useful.
- distortedsignal 3y ago
  I don’t think this would be zero-loss diodes - it would probably superconduct in some x-axis while being non-superconducting in the y- and z-axis. Even then, it’s not clear to me what the conductivity is like in the non-superconducting axies.
  - deleted 3y ago
    [deleted]
- jacquesm 3y ago
  Especially if the material happens to have photo electric properties too...
  - fsckboy 3y ago
    ...and gain, at an incredibly fast slew rate! I mean, we're laundry list fantasizing, right? [shrug emoji]
    - jacquesm 3y ago
      Well, yes. But both Silicon, Selenium and Germanium as well as all metals that are shiny are photoelectric. If this thing can form diodes that open a potential path to very high efficiency solar cells. It wouldn't be the first either: https://www.nature.com/articles/srep11504 https://www.nature.com/articles/srep11504 "Origin of photovoltaic effect in superconducting YBa2Cu3O6.96 ceramics"
- mmusson 3y ago
  How would that work? A diode requires a p-n junction created by doping the substrate. It has low resistance in one direction but ideally infinite resistance in the other direction.
  - mmusson 3y ago
    I just saw an article that explains the superconducting diode effect https://phys.org/news/2023-08-ubiquitous-superconductive-diode-effect-thin.amp https://phys.org/news/2023-08-ubiquitous-superconductive-dio... So theres the answer.
wbl 3y ago
The really cute thing is conducting in one axis insulating in the other two. Then you get to have a very high density interconnect for free.
ibic 3y ago
I think you are referring to the pioneer work done by Prof. Chair Tong-seek (or Dongsik Choi as another spelling) here? https://twitter.com/sanxiyn/status/1684437744406392833 https://twitter.com/sanxiyn/status/1684437744406392833 Any Korean can give some brief summary over the book that tweets mentioned?
- ssamt 3y ago
  There is a short introduction right on the link. "The author writes on the influence and meaning of the certain future superconductor revolution on humanity, and while showing similar guise as Western science, he attempts to maintain the notion of the Oriental spirit, the confidence and self-esteem of East Asian scientist." Something like that. I'm not sure what it means. (Also, yes, Choi Dongsik is probably correct.)
floxy 3y ago
The one-dimensional things seems like it could make it complicated to measure the resistance. Especially since the bulk material that seems like people are making isn't being laid down in thin films where you might know which direction the conductivity might go. What if there are superconducting grains/domains that abut to each other, but the 1-D paths are then not aligned? Even if you knew that the "domains" were aligned with each other, but didn't know the orientation, it seems like you'd measure a drop-off in resistance, but not to zero at the critical temperature. Maybe?
frognumber 3y ago
Such things are possible, and not even very uncommon. The human body has tissues with conductivity different in different dimensions. If you'd like to create one yourself, take a bunch of parallel insulated wires. Conductivity will be low along the wires, and high perpendicular to them. Or alternated high-resistivity and low-resistivity sheets. Conduction will be low parallel to the sheets, and high going through them. Lots of things behave like that.
- monocasa 3y ago
  See also Z-tape. https://www.3m.com/3M/en_US/p/d/b10167835/ https://www.3m.com/3M/en_US/p/d/b10167835/
- aziaziazi 3y ago
  > human tissues > isolated wires > alternated sheets The thinks you describes are systems made of multiple materials. Are you aware of a materials that behave that way by its own ?
  - Filligree 3y ago
    No, and LK-99 isn’t made of a single material either.
    - criddell 3y ago
      How do you mean? It isn’t like a wire where you typically have separate insulator and conductor materials, is it?
    - aziaziazi 3y ago
      Can you elaborate on that ? For noobs like me, LK-99 only contains Pb9Cu(PO4)6O, doesn’t it ?
      - Someone 3y ago
        _If_ some of its properties change depending on the direction you measure, it can’t look the same in all directions. As a simple example, consider graphite. That’s just ‘C’, but the crystalline version is layered, so it behaves differently depending on what direction you look at it. Like wood, it will split easier when hammered parallel to the layers than when hit oblique to it.
pjc50 3y ago
An even better version of https://en.wikipedia.org/wiki/Anisotropic_conductive_film https://en.wikipedia.org/wiki/Anisotropic_conductive_film or "zebra tape", maybe.

ThrowawayTestr 3y ago

Zero loss diodes seem pretty useful.

distortedsignal 3y ago
I don’t think this would be zero-loss diodes - it would probably superconduct in some x-axis while being non-superconducting in the y- and z-axis. Even then, it’s not clear to me what the conductivity is like in the non-superconducting axies.
- deleted 3y ago
  [deleted]
jacquesm 3y ago
Especially if the material happens to have photo electric properties too...
- fsckboy 3y ago
  ...and gain, at an incredibly fast slew rate! I mean, we're laundry list fantasizing, right? [shrug emoji]
  - jacquesm 3y ago
    Well, yes. But both Silicon, Selenium and Germanium as well as all metals that are shiny are photoelectric. If this thing can form diodes that open a potential path to very high efficiency solar cells. It wouldn't be the first either: https://www.nature.com/articles/srep11504 https://www.nature.com/articles/srep11504 "Origin of photovoltaic effect in superconducting YBa2Cu3O6.96 ceramics"
mmusson 3y ago
How would that work? A diode requires a p-n junction created by doping the substrate. It has low resistance in one direction but ideally infinite resistance in the other direction.
- mmusson 3y ago
  I just saw an article that explains the superconducting diode effect https://phys.org/news/2023-08-ubiquitous-superconductive-diode-effect-thin.amp https://phys.org/news/2023-08-ubiquitous-superconductive-dio... So theres the answer.

wbl 3y ago

The really cute thing is conducting in one axis insulating in the other two. Then you get to have a very high density interconnect for free.

ibic 3y ago

I think you are referring to the pioneer work done by Prof. Chair Tong-seek (or Dongsik Choi as another spelling) here? https://twitter.com/sanxiyn/status/1684437744406392833 https://twitter.com/sanxiyn/status/1684437744406392833 Any Korean can give some brief summary over the book that tweets mentioned?

ssamt 3y ago
There is a short introduction right on the link. "The author writes on the influence and meaning of the certain future superconductor revolution on humanity, and while showing similar guise as Western science, he attempts to maintain the notion of the Oriental spirit, the confidence and self-esteem of East Asian scientist." Something like that. I'm not sure what it means. (Also, yes, Choi Dongsik is probably correct.)

floxy 3y ago

The one-dimensional things seems like it could make it complicated to measure the resistance. Especially since the bulk material that seems like people are making isn't being laid down in thin films where you might know which direction the conductivity might go. What if there are superconducting grains/domains that abut to each other, but the 1-D paths are then not aligned? Even if you knew that the "domains" were aligned with each other, but didn't know the orientation, it seems like you'd measure a drop-off in resistance, but not to zero at the critical temperature. Maybe?

frognumber 3y ago

Such things are possible, and not even very uncommon. The human body has tissues with conductivity different in different dimensions. If you'd like to create one yourself, take a bunch of parallel insulated wires. Conductivity will be low along the wires, and high perpendicular to them. Or alternated high-resistivity and low-resistivity sheets. Conduction will be low parallel to the sheets, and high going through them. Lots of things behave like that.

monocasa 3y ago
See also Z-tape. https://www.3m.com/3M/en_US/p/d/b10167835/ https://www.3m.com/3M/en_US/p/d/b10167835/
aziaziazi 3y ago
> human tissues > isolated wires > alternated sheets The thinks you describes are systems made of multiple materials. Are you aware of a materials that behave that way by its own ?
- Filligree 3y ago
  No, and LK-99 isn’t made of a single material either.
  - criddell 3y ago
    How do you mean? It isn’t like a wire where you typically have separate insulator and conductor materials, is it?
  - aziaziazi 3y ago
    Can you elaborate on that ? For noobs like me, LK-99 only contains Pb9Cu(PO4)6O, doesn’t it ?
    - Someone 3y ago
      _If_ some of its properties change depending on the direction you measure, it can’t look the same in all directions. As a simple example, consider graphite. That’s just ‘C’, but the crystalline version is layered, so it behaves differently depending on what direction you look at it. Like wood, it will split easier when hammered parallel to the layers than when hit oblique to it.

pjc50 3y ago

An even better version of https://en.wikipedia.org/wiki/Anisotropic_conductive_film https://en.wikipedia.org/wiki/Anisotropic_conductive_film or "zebra tape", maybe.