Excitations in quadrupolar-coupled systems

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


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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