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A Material Found To Carry Current In a Way Never Before Observed (phys.org)
An anonymous reader quotes a report from Phys.Org: Scientists at the Florida State University-headquartered National High Magnetic Field Laboratory have discovered a behavior in materials called cuprates that suggests they carry current in a way entirely different from conventional metals such as copper. The research, published today in the journal Science, adds new meaning to the materials' moniker, "strange metals." Cuprates are high-temperature superconductors (HTS), meaning they can carry current without any loss of energy at somewhat warmer temperatures than conventional, low-temperature superconductors (LTS). Although scientists understand the physics of LTS, they haven't yet cracked the nut of HTS materials. Exactly how the electrons travel through these materials remains the biggest mystery in the field.
For their research on one specific cuprate, lanthanum strontium copper oxide (LSCO), a team led by MagLab physicist Arkady Shekhter focused on its normal, metallic state -- the state from which superconductivity eventually emerges when the temperature dips low enough. This normal state of cuprates is known as a "strange" or "bad" metal, in part because the electrons don't conduct electricity particularly well. Scientists have studied conventional metals for more than a century and generally agree on how electricity travels through them. They call the units that carry charge through those metals "quasiparticles," which are essentially electrons after factoring in their environment. These quasiparticles act nearly independently of each other as they carry electric charge through a conductor. But does quasiparticle flow also explain how electric current travels in the cuprates? At the National MagLab's Pulsed Field Facility in Los Alamos, New Mexico, Shekhter and his team investigated the question. They put LSCO in a very high magnetic field, applied a current to it, then measured the resistance. The resulting data revealed that the current cannot, in fact, travel via conventional quasiparticles, as it does in copper or doped silicon. The normal metallic state of the cuprate, it appeared, was anything but normal.
For their research on one specific cuprate, lanthanum strontium copper oxide (LSCO), a team led by MagLab physicist Arkady Shekhter focused on its normal, metallic state -- the state from which superconductivity eventually emerges when the temperature dips low enough. This normal state of cuprates is known as a "strange" or "bad" metal, in part because the electrons don't conduct electricity particularly well. Scientists have studied conventional metals for more than a century and generally agree on how electricity travels through them. They call the units that carry charge through those metals "quasiparticles," which are essentially electrons after factoring in their environment. These quasiparticles act nearly independently of each other as they carry electric charge through a conductor. But does quasiparticle flow also explain how electric current travels in the cuprates? At the National MagLab's Pulsed Field Facility in Los Alamos, New Mexico, Shekhter and his team investigated the question. They put LSCO in a very high magnetic field, applied a current to it, then measured the resistance. The resulting data revealed that the current cannot, in fact, travel via conventional quasiparticles, as it does in copper or doped silicon. The normal metallic state of the cuprate, it appeared, was anything but normal.
Now if Obama were still in office (or if Hillary got her rightful place) think of how much more government funding THIS study would of gotten.
But alas, TRUMP has killed the EPA and has killed SCIENCE.
we can only pretend that we cannot feel it.. some things in the air,, as we hang on to our hemispheres, creation all +++++, plus no straight lines or round circles,, we invented the ever growing minus pool.. cease fire stand down.. that's the spirit..
In the spirit of Slashdot ... can we use this in a Tesla 3 battery?
While I understand only half of these words, advances in high temperature superconductors have the potential to have an incredible impact on an incredible amount of things, and understanding how they work is a precious first step.
Imagine super long distance lossless power lines, incredibly strong electromagnets everywhere, awesome maglev trains, and whatever repercussions this might have for electronics.
Sure, HTS still work at cryogenic temperatures, but if they can be at least made to work around the temperatures of cheap liquid nitrogen, this would be awesome!
Multiple posts, all idiots, and the freaking Article doesn't even link the free, actually readable link to the story.
All I see here anymore are political whining, Team trolling, paid positions, and bullshit.
The first actual science in a while, and no interest.
Wow.
Here's a link to ArXiv, and the original pdf:
https://arxiv.org/abs/1705.058...
Truth isn't Truth - Guliani
The debate on which direction electrons flow (to positive + or to negative -) is ALMOST as heated as vi vs EMACS. Now they want to inject a new vector? WW III commencing in 3, 2, 1...
"A person is smart. People are dumb, panicky dangerous animals and you know it." - K
Are you talking to a mirror?
There's supposed to be a comma after "Apparently." I hope you're proud of yourself, you ignorant bastard!
Have you been voting Republican since the '70s? If so, this is partly your fault and I don't want to hear your bitching. That party has consistently been defunding education my entire life. You rip what you sew, or so I've herd.
Photo
Electrons are negative. Hence they flow from negative to positive. Unless you aren't living on this side of the big bang, of course, and are the goatee-wearing evil anti-matter version of yourself.
The MOST annoying freaking thing in electronics education though, is when the writer fails to mention if he means the technical or physical direction. (IMHO, fuck the "technical" direction! Just admit you got it wrong back then, and get real!)
Not as annoying as the "Jraphics Interchange Format" herd though. Now *there*'s a reason to start WW III, aka "humans VS retards"! :)
Just with a different polarity.
Emacs is not an editor, but a OS anyway. :)
But that aside, they are the opposite of emergent or elegant.
Notepad is easy but also way too powerless.
Emacs and Vim are powerful but also way too hard.
It’s that power per difficulty ratio that's important.
A *good* editor would be as powerful as Vim/Emacs, AND as easy as Notepad.
My favorite editor is Kate.
I could use a bit more power though. But not without compromising usability.
You mention maglev trains and powerful magnetic fields.
The article is clear that the resistance of the LSCO material increases with temperature, and this new research finds that it similarly increases in the presence of strong magnetic fields, suggesting a very simple fundamental property behind the observed behavior.
In any case, this HTS does not work well in the presence of strong magnetic fields, so you can cross that application off your list.
See, it is running hot so it can take advantage of the HTS!
Or maybe you can recognize that native speakers typically elide in informal speech.
Recognition of cultural linguistic patterns is the difference between our college education and your high school education.