Superconductivity Definition and 142 Threads

Hello guys, I will be starting my M.S Program in Solid State Electronics and was also curious about looking into quantum computing/superconductors. So can you guys suggest introductory levels books on quantum computing and and superconductors? I have an okay background in Physics (just...

There is a conservation law for superconductors " the flux through a superconducting ring cannot change". This can be shown using Faraday's law: - E.M.F=-d/dt (BA) where B is the measured magnetic field passing through the ring and A is the area enclosed by the ring therefore for a ring...

Curious: say, it takes a particular piece of superconductive material "x" seconds to reach the state when submerged in liquid nitrogen. Now, say we try to do the same in presence of a (strong) magnetic field. Does x increase, decrease or does it stay the same? My money is on increasing, because...

Hi, name's Sehaj. I'm in my first year of a Natural Sciences degree studying at the University of Leeds, England. It's a flexible degree with a masters option which I'm looking to take, perhaps gearing towards working in materials science. But I also have an interest in nanotechnology...

Hello, I have to do a little research for school. My partner and I liked the topic Supercondutivity. Do you guys know any interesting research topics in this area? We are 16 years old and have basic Physical knowledge. There is an university in our area where we can do research at (if we have a...

Hi there, first poster here. Something has been boggling me and I cannot seem to find the answer anywhere. I really hope that you will help me =) A magnet train in vacuum has no friction whatsoever, right? Then what about electron interactions between the 'rail' and the train itself due to...

I just wanted to introduce myself and tell you that my passion and interest is superconductivity and low temperature physics. If there is anyone in this field whether he or she works on experimental aspect or theoretical or computational, or just interested in this field, please let us know!

Let us suppose that there is a superconducting toroid. Let us also suppose that there is a finite electric current flowing in it. We imagine the temperature of the toroid to be below the critical temperature. Now if we try to raise the temperature of the toroid then due to the law of...

Homework Statement The problem is Exercise 1 here: http://www.open.edu/openlearn/science-maths-technology/engineering-and-technology/engineering/superconductivity/content-section-2.1. I am interested in question (c), where you are asked to estimate the maximum possible resistivity...

Certain objects are able to influence the behavior of magnets when super-cooled. Does this violate Maxwells equations?

In the above picture it is clear that the transition from normal to superconducting states is not infinitesimally sharp, it drops from around 4.22K ~ end at 4.20K. I have two questions for this: 1) I wondering, what can be seen if taking a snap shot in the middle, say @ 4.21K? Would I see...

Two questions, really: I’m finding it hard to wrap my head around the connections between k-space and real-space for d-wave symmetry, as well as the connections between “order parameter,” “gap,” “Cooper pair wave function,” and “superconducting wavefunction,” which are all mentioned at various...

Hi, I am fairly new to superconductivity (introductory college level). I have covered and grasped the basics but was wondering if someone could shed some light on what specifically causes materials to have zero resistance when they become superconducting. I know that cooper pairs form when the...

Hi 1) Can all chemical elements be superconductive? 2) It is said that in diamagnetic materials there are no unpaired electrons. Does this mean that only such materials can be superconductive?

Hi everyone, I tried to study BCS theory but got stuck, here are my notes: I have a civil engineering degree but now I am doing a master course in physics. I know most of the undergraduate level physics including modern physics (base on Young and Freedman's book), although I cannot say...

is the BCS theory of low temperature superconductivity completely accepted already? any doubters here? I encountered this paper that suggests the BCS is incomplete: http://physics.ucsd.edu/~jorge/abstracts/bcs.pdf "The most quoted reason given as convincing proof that BCS-electron-phonon...

Hi, not sure if this is the right forum but I was wondering if superconductivity could theoretically be accomplished somehow with the weak and strong forces and gravity just as it could be accomplished in the electromagnetic field. Would superconductivity of the strong force be the same as cold...

Superconductivity... awkward Superconductivity says that below certain temperature, certain materials offer 0 resistance to the current flowing through them... But how is this possible ? resistance offered is because of loss of kinetic energy of electrons due to collision with atoms' nuclei...

According to theory of superconductivity, resistivity almost zero. Below critical temperature the entropy decreases markedly with cooling . why resistivity zero when entropy not equal to zero? my doubt is when there is an entropy there is a disorder. then how can move conducting electron...

please let me know the best universities for everything about low temperature superconductivity research

I can't get a definitive explanation of why superconductivity happens and I am getting mixed explanations from my textbooks. I will tell you what I know and hopefully you can correct any misunderstandings I have: • A metal consists of an ionic lattice because the electrons in the valence band...

Hi just completed a chapter on Superconductivity in a solid-state physics book. I have a few remaining questions. I don't expect they can be easily answered, but I appreciate if someone happens to know. Most of the questions regard how the equations have been motivated. I guess that's kind of...

I am just introduced to basics of superconductivity in Engineering Physics. My lecturer asked a question: Is the resistance of a superconductor zero or close to zero? And my answer was close to zero. I have read that the resistance of a superconductor is exactly zero, but then when I put some...

[Moderator's Note: This thread is split from a textbook thread: https://www.physicsforums.com/showthread.php?p=4275234#post4275234] Exellent book. Especially 1953 year edition. It has no subsequent ideas of Cooper pairing, preventing us of from understanding of HTS...

Hi all, Can someone recommend a good book on how to learn about superconductors, a general overview of the field? Is there any book in the field of superconductivity ananlogous to the big book of gravitation in general relativity? If you know of more than one good intro to superconductivity...

What field in theoretical physics can you enter to do research in superconductivity?

Can some one explain to me how superconductivity works exactly? I will type all I know about it so can you guys correct any misconceptions I may have? Superconductivity is the phenomenon in which a conductor, when cooled sufficiently (past a critical temperature Tc) exhibits negligible...

Hi all, I've been told from a couple different people something along the lines of "we don't fully understand how melting (the phase transition) works". Same with superconductivity. But I thought melting was fairly straightforward: The molecules in the material keep gaining energy until...

We have some material with metal atoms inserted in substrate.Maybe by dopping. Electric current is able to move only be quantum tunneling jumping from atom to atom. Could we obtain superconductor in this way?

Would someone explain me superconductivity IN ATOMIC WORLD? if this doesn't belong in quantum physics I am sorry admin

It was observed that stripe phases appear in some high-temperature superconductivity and it is believed to be related to strongly-correlated electron system. Is the mechanism of the formation of stripe phase completely known? Does it appear in non-superconducting systems as well?

So how does High Temperature Superconductivity work? Classical Superconducitivty is done by cooper pair and the BCS mechanism, what is the counterpart in High Temp SC? Can it reach room temperature?

So my Cosmology prof (who does research in String Theory) mentioned something during class a few days ago that the driving factor behind Superconductivity is that the speed of light changes. Someone in my class spoke to him after the lecture about it and he rambled on about something to do...

Superconductivity: a very short introduction Im looking for a book that will follow up this book. It needs just more detail but not lots of maths and equations just a longer introduction any ideas?

Take for instance putting the large hadron collider in space at a near absolute zero where you never have to put energy into cool down the system. The LHC takes 10 GJ to run and the total energy of the two beams is 724 MJ. [1] Since the power to run the system never experiances resistence, would...

I'm looking for a pedagogic introduction to d-wave superconductivity on the level of field theory. Ideally, this would involve a derivation of d-wave superconductivity and the form of the gap parameter from some fundamental Hamiltonian (if such a derivation is even possible yet). Books and...

What is the present consensus about it? What do you think is the most plausible mechanism? What do you think is the highest temperature that can be attained, perhaps room temperature?

how can we achieve superconductivity in fullerenes?

So, according to the Fermi function, the higher the temperature of a semiconductor, the higher the likelihood that the electrons can jump to the conduction band. But in superconductors, obviously the temperature is extremely low, so how does the Fermi level, band gap theory, and...

In the last chapter of "Feynman Lectures on Physics" part III, Feynman discusses superconductivity. I am particularly intrigued by his equations (21.19) and (21.31), and even more by (21.38). Is there any experimental evidence for validity of these equations? The question of validity of these...

Hi all - I've got a bit of hesitation regarding the next step in my research... The setup: I've fabricated a uStrip HTSC resonator that I'm trying to characterize on a VNA. The sample is placed in a jig with coaxial feeds, and the jig is cooled via a cryo-cooler. The problem I'm having is...

I have the following problem understanding Pauli exclusion principle. Two identical fermions can't share the same quantum state. Two bosons can. Now Cooper pairs are bosons made up from fermions. Everything clear up to this point. Now several Cooper pairs can share the same quantum state...

Hi all! I am learning superconductivity for the first time. As i saw, the supercurrent of some material is governed mainly by electron pair! Now my question raises here, how do those electron pairs form? What are their features compared to single electrons? Here is what i guess: "at very...

After the first explanation of superconductivity by Bardeen, Cooper and Schrieffer, it was for several years a matter of concern to render the theory charge conserving and gauge invariant. I have been reading the article by Y. Nambu, Phys. Rev. Vol. 117, p. 648 (1960) who uses Ward identities to...

Hi, My question is about Type1 and Type2 superconductors. Is there a difference between the mechanisms of superconductivity in type1 and type2? And why type2 display different critical magnetic fields as a function of orientation? I have no idea about this. It'd be great if anyone...

Does anybody know how p_x + i p_y symmetry arises in a p-wave superconductor ? How does the complex form arise ? Thanks a lot ...

I'm very new to superconductivity and I've tried searching for the difference between s-wave and d-wave superconductivity but to no avail. I find it's often mentioned but never explained. I assume it's fairly basic, but if anyone has an explanation or some references I can check, it would be...

I am struggling for some time to understand the concept of broken symmetry. As I come more from the solid state side than from high energy physics. My problem is the following: I understand, how e.g. the rotational symmetry in a ferromagnet is broken. The magnetic moment is observable and I can...

Well. I have the image of the question. http://img99.imageshack.us/img99/6834/question5.png Question b)ii). I know that the total resistance of the cable is 0 even though the copper itself still has resistance. I just want to know how the combination of the Superconducting filaments...

Please, I found this (the 4 lobe object in the center): http://www.physics.utoronto.ca/lecture-and-seminar-series/colloquium/events/tsuei.jpg But is it the same throughout the z axis, or does it vary significantly?