Superconductors Definition and 147 Threads

I don't know much about the theory behind superconductivity and how exactly material scientists are able to create new materials so if this is a stupid question I do apologize in advance. While looking though a list of high temperature conductors I noticed that cuprates are composed of oxygen...

Crystals may contain electronic real-space-eigenstates as ground states, which are spatially much larger than one unit cell, such as impurity states, standing waves at Brillouin zone edges, states of Anderson localization, etc. Every eigenstate is usually occupied by two conduction electrons...

If we consider YBCO 123, YBa2Cu3O7-δ, what would the expected reaction if dissolved in aqeuous HCl? I have tried to find resources about this online, but the closest I got was related to Cl-containing YBCOs, and not actual reaction stoichiometry. My intuition tells me the metal centers (Y, Ba)...

Hello. I have 2 questions. First, I've read theory of tunneling effect but I need theory of two and more delta functional barriers. How do you think where can I read more about it? I need it for superconductors. And second, where can I find how to add magnetic field to theory of it? How it...

Imagine, in a mercury ring (superconductivity below Tc=4.15 K) we establish a persistent supercurrent. Then we organize temperature cycles (T-cycles) in the cryostat, from 3 K to 2.5 K and back. According to the BCS theory of superconductivity, the pair density decreases at warming, i.e. a not...

How are currents injected into a superconductor? And can you regulate the velocity of the current afterwards? Since the magnetic field can’t penetrate? What would happen if you tried to make the Cooper pairs approach relativistic speeds? Would the superconductor stop being in its...

How do one get the electrons to move inside a superconductor? Since I have understood superconductors repel magnetic fields due to the Meissner effect, or is that when the charges already are moving within the superconductor? If so how did we get them o move from the beginning? Can you make...

I'm currently doing an experiment with magnetic levitation but I don't know if my independent variable will even affect my results at all. I am planning on building a rail of magnets and levitating a type 2 superconductor on it. I wanted to change the material surrounding the rail of magnets...

Hi, As an Undergraduate student I'm looking for some textbooks and/or articles as an introduction to superconductors. I have a homework to do as final project not exactly in this field but related. and I would like to understand what exactly is a superconductor as well as use those textbooks...

I have some questions to this Ansatz and I would really appreciate it if I can get some insight: 1. What is the current status of gate fidelity and what are the current struggles to improve it? 2. Same question but with coherence times. 3. What are the current issues with scalability? 4. Could...

Hello! Recently, I became interested in superconductors. And I talked to professor in my uni. Here's my question, since superconductors have zero resistance by definition, so, in stable condition (after passing transient phase) the current should be infinite. Which implies that according to...

Molecules and superconductors bind due to overlaps of the wave functions of the electrons. 1. What is the difference between these two then? 2. Why can't we look at molecules as a macroscopic wave function?

London penetration depth that's defined for superconductors has a similar equation to skin depth in conductors derived from maxwell's equations. Are they equivalent?

Due to my lab work I want to try map the phase space that created with critical external magnetic field H_c and the critical current J_c through the superconductor of type II. the critical transition happen from the Abrokosov phase to the non-superconductor phase, occurred by the fact that in...

Hello to all Can we consider the core of the Earth to be a superconductor ,for example Aragon national laboratory hinted for some thing like that https://www.anl.gov/article/nickel-for-thought-compound-shows-potential-for-hightemperature-superconductivity That been said , what test could...

Assume resistor R/heated segment is 5 Ohms, while the path in the right hand side remains 0, thus, total resistance is 0 Ohms, my question is how could current be induced if potential difference is 0(due to zero total resistance) Or is it probably because of the batteries internal resistance?

Zero resistance in wiring seems to be the technology in the future. Any resistance in the transmission wiring acts like loads so it's like the current wastes itself on the resistances in the wiring and heat that occurs. So lossless wiring seems to be the ultimate goal. In Large Hadron Collider...

How are Cooper pairs being in the same quantum state responsible for superconductivity? Why does them being in the same quantum state matter? Please no complex mathematics, I don't understand that stuff :)

I don't know if this is the right place to put this, but I am very lost as of right now. I am doing my 11th grade physics project on magnetic levitation. From what I can understand, there are 2 "main" types of magnetic levitation, them being with superconductors and with electromagnets. For the...

If a weakly-interacting massive particle interacted with an electron in a classical superconductor would it break up a "cooper pair" and thus lead to extra electrical resistance? If so perhaps the loss of superconductivity in a 2-d array of superconducting wires could be used to detect the flux...

Dear All I am trying to study Topological superconductors but i have no idea about it. Can anyone suggest me an introductory book to start with.

So I am writing a paper on superconductors, and i am trying to explain the meissner effect. However i seem to be running into conflicting information. I hoping some one can help clarify. The effect happens, when a magnet creates a change in flux, causing a induced current in the...

Hi everyone, I am about to finish my PhD and need to start thinking about trying to move somewhere else. One line of research that caughts my attention is that of the cuprates, and the study of their phase diagram. I would like to know if someone can suggest a very recent book or review article...

To my current(somewhat pathetic:wink:) knowledge the reflection off metal surfaces happens because the changing electric and magnetic fields cause "mini currents" or charge redistributions which produce their own electromagnetic waves identical to the incoming ones or in other words the...

I am not a physicist and don't understand a lot of it, I can't do maths, but in all other areas I consider myself an above average educated civilian. I had a strange dream and it got me thinking. Has anyone ever done a synchronized atomic clock test with a superconducting element? Like placing...

Consider a 5 meter by 5 meter and 1cm thick superconducting plate, now place a very strong neodymium magnet against the underside of the plate.The plate is big enough so that the magnetic field does not go around the plate. Does a magnetic field penetrate the plate or is it blocked completely...

If you have: A Linear Induction Coilgun, basically like a series of Induction Furnaces, using copper coils with high AC current at a high frequency. Where the projectile traveling inside those coils has a shorted superconducting coil around the outside of it, embedded in the ceramic projectile...

Homework Statement Hi, I have some data taken on voltage and resistance of a coil part of a yttrium barium copper oxicde (ycbo) superconductor. I have no information about the coil itself. A thermocouple attached to the superconductor also measured the temperature of it as it was cooled. This...

I was reading an interview of Dr Subir Sachdev in the latest online issue of Quanta Magazine, and he mentions that Cooper pair electrons in the high temp superconductors (HTSC's) are globally entangled with one another, but in the low temperature (type 1) superconductors, they are not, and I...

Does a superconductor experience any forces acting upon it when it is passed through a magnetic field?

Hello, I have been looking at superconductors lately and was wondering if there was anywhere I could get a small superconductor online. I realize for it to actually conduct it must be incredibly cold, but I was wondering where I could get a metal that allows for superconduction.

The question I have is rather simple and straightforward so here it is: How much weight can a magnet support and still levitate above a superconductor? We all know about super fast levitating trains and I want to use the same idea for something else. However before looking deeper into magnetic...

I am working on a project for our local science fair and decided on researching quantum computers. (This is what my focus will be in college.) Though, I expect to work on this far past the time allotted for that. I would like to build a superconductor based qubit using Josephson Junctions. The...

I've just learned that the conductivity of super conductors increases with decrease in temperature and it becomes infinite at absolute zero. But I thought that all motion ceases at absolute zero. So how can current flow in such conditions? And how can its resistance become zero as some...

Good day! i really need your help, I want to know the effect of Dopant (for Example Manganese) in BSCCO (for example Bi-2212) on it's Resistivity? i read some articles saying it increases the critical temperature of the superconductor, But it didn't explain why, and how is that related to the...

1: Faraday's law states that a changing magnetic flux induces a voltage. 2: Voltage is the integral of E field with distance. 3: In a superconductor, or equivalently an with idealized wires having 0 resistance, there can't be any electric field inside. Thus, voltage in a superconductor should...

Hi, I'm a retired (since 2011) Physics prof from the University of British Columbia. I originally set out to get a PhD in Physics to increase my credibility as a science fiction writer, but I discovered a field* that was so cool it was like being a character in my own SF novel. In short, I got...

If I surrounded a wire carrying current with a superconductor would the magnetic field from the wire be blocked from the outside?

Hi all, I am currently writing a report about superconductors, and am currently reading about how the band gap shows that single electrons are not the charge carriers responsible for superconductivity. However, I was confused when I read that electrons are fermions and as such there are no band...

Hej Guys, Is there a way to calculate the magnetic field behind a superconductor? I mean the model is like some simple block magnet and a bigger superconductor plate to try to shield the magnetic field. How strong the magnetic field would be above(behind) the SC? B, H is given. Also is the...

New member here, would love to talk about superconductors, photons and electrons and energy conversion. Feel free drop drop me a question.

Hope this Link works. I thought this guy was great, for the layperson looking for more than the usual fluff. Might nice to give SITP some heavy "likes". Maybe they will do more. Sorry not sure what forum this was most appropriate for...

If a field line is moved into a superconductor it meets resistance. This resistance is modeled by adding an image flux thread outside the superconductor which then attracts the flux thread being moved into the superconductor. Why is this attractive force an accurate model of the resistance a...

When reading some material concerning Ginzburg-Landau theory of superconductors, I got the following sentence: The appropriate thermodynamic potential for describing a superconductor in an applied magnetic field is the Gibbs free energy ##G## (natural variable ##H##) and not the Helmholtz free...

I am confused about the magnetic susceptibility vs. temperature curves (or MT) of superconductors (SCs). In the normal conduction state (I measured from 4.5K to 300K), the susceptibility curve can obey the Curie-Weiss law. But when I fitted the data via the Curie-Weiss law in a different...

What would happen to a metal superconductors taken below zero to a negative temperature? Would it loose its superconductivity?Regards, JDM

This might be another silly question but here it goes; I was reading how " A superconductor excludes the lines of magnetic force" http://www.aip.org/history/mod/superconductivity/01.html and I'm wondering if a giant superconducting magnetic field could help protect spaceships/space stations...

Hi Guys, Please give me an example or list of Metallic superconductors (new metallic superconductors (year 2010-2014). thanks :).

Just had an idea that raised a few questions and I can't find any relevant data on after a bit of searching so thought I'd ask here. If you were to make a transformer entirely encased in superconducting material would it result in a significant step toward and ideal transformer or is magnetic...

Hi! I was wondering that if you could put enough electricity into a superconducting coil if it would be powerful enough to bend space?