Both BEC and superfluidity are under the theory of Spin Switch. Of
course, modern physics has not yet developed systematic experiments to
check for spin switch, nor has modern physics developed systematic
methods of checking for subshell switching for superconductivity. But
if spin switch theory is true, one would expect BEC to be concentrated
at a specific part of the Periodic Table. And that it is, for if you
look at the alkali metals, they are the main elements of BEC.
--- quoting Wikipedia on BEC, the isotopes header ---
The effect has mainly been observed on alkaline atoms which have
nuclear properties particularly suitable for working with traps. As of
2010, using ultra-low temperatures of 10-7 K or below, Bose-Einstein
condensates had been obtained for a multitude of isotopes, mainly of
alkaline and alkaline earth atoms (7Li, 23Na, 39K, 41K, 85Rb, 87Rb,
133Cs, 52Cr, 40Ca, 84Sr, 86Sr, 88Sr, and 174Yb). Condensation research
was finally successful even with hydrogen with the aid of special
methods. In contrast, the superfluid state of the bosonic 4He at
temperatures below 2.17 K is not a good example of Bose-Einstein
condensation, because the interaction between the 4He bosons is too
strong. Only 8% of the atoms are in the single-particle ground state
near zero temperature, rather than the 100% expected of a true Bose-
Einstein condensate.
--- end quote ---
So that one can easily see that BEC and alkali metals are the main
purveyor of BEC, which indicates and supports the theory of spin
switch.
Spin Switch is when the temperature is so much lowered in coldness,
that a paired electrons, one up and one down, switch to a two up
electrons as is the case of helium, or in the case of lithium we have
the three electrons of the 1s and the 2s where all three electrons
have up spin.
Spin Switch would account for the fact that halogens do not BEC and
the best that can be done is for Yb, a transition element of the f and
d subshell.
Now we also need a new methodology of checking for Subshell Switching
for superconductivity. As Oxtoby and Nachtrieb note on their page 521
of their textbook that the anomalies of subshells closely matches the
elements that are superconductive. So here again, where the alkali
metals match those that are BEC amenable, the anomalies of subshells
matches those elements that are superconductive.
Now Oxtoby & Nachtrieb discuss the technique of photoelectron
spectroscopy on page 523, but is that method good enough to experiment
with niobium at 9 Kelvin or palladium at 3 Kelvin to see if the metal
has made a Subshell Switch? And further, to see if Ag, Cu, Au, no
matter how low a temperature, makes no subshell switch?
So here again, the evidence is all pointing towards the two theories
of Subshell Switch for superconductivity and for Spin Switch for BEC
and superfluidity, both of which are derived from Maxwell Equations.
So we see here the task and job ahead for modern physics and
chemistry, is to develop experiments and experimental techniques to
check for Subshell Switch and to check for Spin Switch at cold
temperatures.
There is no point in me exploring details of the theory until we have
techniques that can actually verify if a switch had taken place.
So in modern day physics, we replace the old fuddy duddy notion of Old
Physics of a "transition temperature" a concept that was lacking of
any physical change. So that in Old Physics, the temperature alone was
standing alone in superconductivity, in BEC, and in superfluidity. In
New Physics, something physically changes when a temperature hits a
certain point-- something physically switches at a certain
temperature, and according to the theories that something is either
the subshell or the spin. In Old Physics, they are happy and content
to walk around and talk around a temperature transition as if the
temperature is a physical parameter of an individual atom. In New
Physics, we toss out those blinders, and recognize that if a atom or
collection of atoms has a transition temperature that something
physically has changed.
So, bring on the experiments, the techniques to measure for Subshell
Switch and for Spin Switch.