Recent content by DrDu

Of course the normal conducting electrons will slow down due to collisions with the lattice atoms. Normal resistivity. Where is the contradiction?

I really think there is a very small transient decrease of supercurrent, if you suddenly decrease the superconducting density by changing the temperature. The penetration depth of the magnetic field and of the current density is proportional to 1/sqrt(n_s). A decrease in n_s leads to an increase...

Found this interesting article: https://arxiv.org/pdf/1609.08451

In principle, this is the Einstein - de Haas effect. The electronic sub-system condenses into a broken symmetry state with non-vanishing angular momentum and the complete system starts to rotate due to angular momentum conservation. PS: Obviously, I am not the first one to remark this...

There is no momentum conservation for the electrons alone. Momentum can always be taken up from or given to the lattice.

Breaking a pair reduces the magnetic field which leads to an electric field which speeds up the other Cooper pairs which increase the magnetic field. In the end, the magnetic field stays constant and the cooper pairs speed up so as to keep current constant, as claimed by the London equations

For me it works fine. For legal reasons I find it problematic to upload papers I do not own.

I looked for bader's electron localisation function and NaCl and found the following paper which seems to support the classical picture: https://www.lct.jussieu.fr/pagesperso/savin/papers/forbader-nacl/forbader-nacl.pdf

The point is that electrons in the same shell are not as efficient in screening other electrons from the nuclear charge as electrons in lower shells. This means that, despite the total atom being electrically neutral, the electrons in the valence shell see a the higher nuclear charge the further...

Isn't this a bimolecular reaction?

Hm, I still have some material, but I would rather prefer to exchange it than to sell it. Best against nematophytes from other sites, but also petrified fungal material.

Somewhat oversimplified, I think you can assume that all valence electrons in d-block elements are d-electrons if the atom has a positive oxidation number. The reason is that with increasing atomic charge, the atom gets more hydrogen like and the aufbau principle will be followed (i.e. d will be...

I wholeheartedly agree. But what do you do if you, for example, expect temperature readings in a clinical study from all over the world? I think you should describe as precisely as possible how to interconvert between different scales as possible, because you can't rely on every data manager...

Maybe it is clearest to explain this differently. The difference between absolute Temperature and Celsius or Fahrenheit is not only a change of units but of scale. For the Celsius scale we define a new quantity $$ t =T-T_0,$$ where ##T_0=273.16\; \mathrm{K}##. ##t## may perfectly well be...

This seems at variance with the definition of a physical quantity as, e.g. explained in the document cited above: "The value of a physical quantity Q can be expressed as the product of a numerical value {Q} and a unit [Q] Q = {Q} [Q] (1)Neither the name of the physical quantity, nor the symbol...