| Autor: |
Freiman, Yuri, Tretyak, Sergei, Antsygina, Tatiana, Hemley, Russell |
| Zdroj: |
Journal of Low Temperature Physics; January 2004, Vol. 134 Issue: 1-2 p535-540, 6p |
| Abstrakt: |
A new quantum system, magnetic quantum rotors, is presented. A magnetic rotor—a rotor possessing nonzero spin—is exemplified by the oxygen molecule. Of the exchange, spin-orbital, and spin-figure interactions contributed by the spin degree of freedoms only the latter was taken into consideration in this study. Phase diagrams of magnetic quantum linear rotors in a crystal field are studied for a system where all angular momentum states are allowed (all-J system) and for one where angular momentum is restricted to have odd values (odd-J system). It is found that depending on the crystal field and the value of the spin-figure coupling constant the orientational phase transition line can display a set of critical points (one, two, three or none in the case of the all-J systems and one, two or no critical points in the case of the odd-J systems) which are responsible for the topology of the phase diagram. |
| Databáze: |
Supplemental Index |
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