Quantum theory of easy plane antiferromagnets in a magnetic field

✍ Scribed by V. M. Loktev; V. S. Ostrovskii

• Publisher: Springer US
• Year: 1981
• Tongue: English
• Weight: 688 KB
• Volume: 43
• Category: Article
• ISSN: 0022-2291
• DOI: 10.1007/bf00115611

✦ Synopsis

The spin excitations of easy plane antiferromagnets with Dzyaloshinskii interactions in an external magnetic field of arbitrary direction are considered using the solution of the self-consistent quantum problem. The one-ion magnetization in the magnetic field is shown to be independent of the field only when S = 3; but when S = 1 the quantum equation for the spin configurations differs from the quasiclassical one. A theory of the interaction of different spin excitation branches is given without limitations on the parameters involved in the problem.

*We have chosen the sign ~r so that the AFM is of the easy-plane type without DI.