The emergence of gaps due to the periodic potential of the lattice.
Understanding the exchange interaction and domain walls. Superconductivity and Nanotechnology introduction to solid state physics kittel ppt updated
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Moving from the Classical model to the Einstein and Debye models. known as phonons
Using Miller indices to define crystal planes and directions.
This is the "heart" of the Kittel text. It explains why some materials conduct electricity while others do not.
Atoms are never truly still. Their collective oscillations, known as phonons, define how solids conduct heat.