PPT Slide

Binary model systems

- elementary magnets pointing up or down

- cars in a parking lot

- binary alloys

-m magnetic moment

+m magnetic moment

Occupied or type A atom

Unoccupied or type B atom

A single state of the system:

All states of the system generated by:

-->generating function

Total number of states: 2N ;

N+1 possible values of the total magnetic moment: M=Nm, (N-2)m, (N-4)m, ...-Nm

number of states >> possible values of total magnetic moments (if N>ɭ)

if the magnetic moments are not interacting M will determine the E total energy of the system in a magnetic field!

( number of states >> possible energy values) --> some states have large multiplicity