978-1-940366-36-4_WholeBook
Boris V. Vasiliev Supercondustivity Superfluidity
Boris V. Vasiliev
Supercondustivity Superfluidity
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Chapter 8<br />
Another Superconductors<br />
8.1 About Type-II Superconductors<br />
In the case of type-II superconductors the situation is more complicated.<br />
In this case, measurements show that these metals have an electronic specific heat that<br />
has an order of value greater than those calculated on the base of free electron gas model.<br />
The peculiarity of these metals is associated with the specific structure of their ions.<br />
They are transition metals with unfilled inner d-shell (see Table 8.1).<br />
It can be assumed that the increase in the electronic specific heat of these metals should<br />
be associated with a characteristic interaction of free electrons with the electrons of the<br />
unfilled d-shell.<br />
Since the heat capacity of the ionic lattice of metals is negligible at low temperatures,<br />
only the electronic subsystem is thermally active.