Quantum Tunneling of the Magnetic Moment in a Free Particle

Details Quantum Tunneling of the Magnetic Moment in a Free Particle Quantum Tunneling of the Magnetic Moment in a Free Particle

2011-08-21

arxiv.org/abs/1108.4189v2

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

7 Figures, 5 Figure Captions, submitted to PRB

Scientific paper

We study tunneling of the magnetic moment in a particle that has full rotational freedom. Exact energy levels are obtained and the ground-state magnetic moment is computed for a symmetric rotor. The effect of the mechanical freedom on spin tunneling manifests itself in a strong dependence of the magnetic moment on the moments of inertia of the rotor. Energy of the particle exhibits quantum phase transitions between states with different values of the magnetic moment. Particles of various shapes are investigated and quantum phase diagram is obtained.

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