Our natural tendency is to think that to see the effects of Einstein's special theory of relativity you have to be travelling at some significant fraction of the speed of light. However, this is not the case. In solid state physics I am aware of three concrete phenomena that are purely due to relativistic effects.
1. Gold metal is the colour "gold".
According to Wikipedia, "non-relativistic gold would be white. The relativistic effects are raising the 5d orbital and lowering the 6s orbital.[11]"
2. Mercury is a liquid at room temperature.
This is nicely discussed in a recent blog post by Henry Rzepa concerning a recent paper that shows that relativistic effects shift the melting temperature by about 100 K.
3. Magnetic anisotropy and hysteresis in ferromagnets.
This results from spin-orbit coupling which is a consequence of relativity.
Subscribe to:
Post Comments (Atom)
From Leo Szilard to the Tasmanian wilderness
Richard Flanagan is an esteemed Australian writer. My son recently gave our family a copy of Flanagan's recent book, Question 7 . It is...
-
Is it something to do with breakdown of the Born-Oppenheimer approximation? In molecular spectroscopy you occasionally hear this term thro... -
If you look on the arXiv and in Nature journals there is a continuing stream of people claiming to observe superconductivity in some new mat...
-
I welcome discussion on this point. I don't think it is as sensitive or as important a topic as the author order on papers. With rega...
I was told once that 'tin pest' occurring at close to room temperature is because of relativistic effects (there is a competition between diamond and 'beta-tin' structures). See possibly this paper.
ReplyDeleteSo if you believe a probably incorrect interpretation of history, (the inadequacy of) relativistic effects were involved in Napoleon's failure to conquer Russia.
Great post Ross!
ReplyDeleteGold and Mercury are probably the best examples, but everything in their neighborhood also possess different chemical and physical properties due to relativistic effects. Lanthanide contraction being an example, but Thallium, Lead and Bismuth have different oxidation states than the other elements in their groups, which alter their structural forms for instance. In this row and the above we find the elements most commonly associated with topological insulators, where spin-orbit is pretty much relevant.
Unfortunately beyond that the elements are all radioactive, so not quite as much data on their properties. Nevertheless just wanted to emphasize your point, a lot of physical and chemical properties depend on relativistic effects, sometimes beyond perturbation theory, majorly when heavy elements are present