Magnetic Field;
Phase Transition;
Field Theory;
Normal State;
Magnetic Material;
D O I:
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摘要:
The following is a thermodynamic analysis of a III order (and some aspects of a IV order) phase transition. Such a transition can occur in a superconductor if the normal state is a diamagnet. The equation for a phase boundary in anH-T (H is the magnetic field,T, the temperature) plane is derived. By considering two possible forms of the gradient energy, it is possible to construct a field theory which describes a III or a IV order transition and permits a study of thermal fluctuations and inhomogeneous order parameters.