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Ground state of interacting quantum magnetic dipoles: transition from a ferromagnetic Fermi liquid to an
1Department of Physics, Indian Institute of Technology Bombay, Mumbai 400 076, India.
Abstract:
We show that the ground state of a system of magnetic dipoles, with no electric charge, is a ferromagnetic quantum Fermi liquid at high densities, driven by the dipolar exchange energy. As in the system of classical point dipoles, the direct dipole energy is zero in this case. With decreasing density, there is a transition to an antiferromagnetic lattice state. An addition of short range hard core repulsive potential will arrest the infinite density collapse of the ferromagnetic state, and possible melting of the low density antiferromagnetic lattice state.
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