What exactly were de Broglie’s matter waves?

Also read – Careful when applying E = hv – de Broglie’s matter wave energy relation

De Broglie actually proposed that ALL matter was essentially waves (of what material – he did not conjecture).  The waves all ‘grouped’ together close to a point that we consider to be the material particle.

This is different from Schrodinger’s wave for a particle – which is neither real – nor does it represent the actual particle’s position.

However, both these physicist were correct. De Broglie’s waves can be applied to photons and other massless particles – as their position essentially coincides with the grouping of their ‘waves’