Diabolical points in magnetic molecules: An exactly solvable model
Abstract
The magnetic molecule Fe_{8} has a rich pattern of degeneracies in its magnetic spectrum as the static magnetic field applied to it is varied. The points of degeneracy, or diabolical points in the magnetic field space, are found exactly in the simplest model Hamiltonian for this molecule. They are shown to form a perfect centered rectangular lattice, and to be multiply diabolical in general. The multiplicity is found. An earlier semiclassical solution to this problem is thereby shown to be exact in leading order in 1/J where J is the spin.
 Publication:

Physical Review B
 Pub Date:
 February 2001
 DOI:
 10.1103/PhysRevB.63.064422
 arXiv:
 arXiv:condmat/0003319
 Bibcode:
 2001PhRvB..63f4422K
 Keywords:

 75.10.Dg;
 75.45.+j;
 75.50.Xx;
 Crystalfield theory and spin Hamiltonians;
 Macroscopic quantum phenomena in magnetic systems;
 Molecular magnets;
 Condensed Matter  Strongly Correlated Electrons;
 Mathematical Physics;
 Quantum Physics
 EPrint:
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