Barma, Mustansir (1974) Excitations in quadrupolar-coupled systems Physical Review B: Condensed Matter and Materials Physics, 10 (11). pp. 4650-4658. ISSN 1098-0121
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Official URL: http://prb.aps.org/abstract/PRB/v10/i11/p4650_1
Related URL: http://dx.doi.org/10.1103/PhysRevB.10.4650
Abstract
The method of double-time Green's functions is used to study the excitation spectrum of an isotropic spin-one system with quadrupolar coupling. It is shown that the random-phase approximation leads to a violation of a spin-one identity and thus to equivocal results. A consistent theory free from ambiguities is developed. Also, exact upper and lower bounds on the ground-state energy of systems with dipolar as well as quadrupolar coupling are derived and studied.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to The American Physical Society. |
| ID Code: | 79564 |
| Deposited On: | 27 Jan 2012 12:43 |
| Last Modified: | 27 Jan 2012 12:43 |
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