Pressure Quenched Excitonic Solids.
Annual rept. Jul 81-Jul 82,
RENSSELAER POLYTECHNIC INST TROY NY
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Theoretical models based on trapped magnetic flux have been tried in order to account for the behavior encountered in some early samples of cadmium sulfide in a slowly varying magnetic field. These models fail to account for the ferromagnetic behavior seen at high fields, of the order of ten kilogauss, although they qualitatively fit the behavior for fields below one kilogauss. The models make use of a network of superconducting filaments containing a non equilibrium distribution of trapped flux which can re-orient itself in a varying magnetic field so as to reduce the free energy of the system. Such a network is similar to an array of superconducting loops which are orientable although not completely free. If the low field strong diamagnetism is to be attributed to superconductivity, as has been previously suggested we are not yet able to incorporate the high field behavior into such a picture. It is possible that the behavior seen in some samples of cuprous chloride and in cadmium sulfide are due to a not yet understood mechanism.
- Electricity and Magnetism