Bistability and Phase Transitions of Nuclear Spin Systems
A nuclear spin system inverted by dynamic nuclear polarization shows properties similar to a laser. In addition a NMR-laser in the radio frequency region can be driven by a phase- locked external RF field. Under such conditions, bistability and hysteresis typical to a first-order phase transition can be observed. Experimental and theoretical results concerning the steady state behavior of the ruby NMR-laser and the dynamics of its phase transitions are presented. In the non-inverted spin state, a nonlinear response to an external RF field has been observed. Conditions are given for which NMR-bistability (the analog of optical bistability) becomes feasible.
KeywordsSpin System Order Phase Transition Dynamic Nuclear Polarization Optical Bistability Reaction Field
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