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The magnetic compound Ba_2CuGe_2O_7 has recently been shown to be anessentially two-dimensional spiral antiferromagnet that exhibits anincommensurate-to-commensurate phase transition when a magnetic field appliedalong the c-axis exceeds a certain critical value H_c. The T=0 dynamics isdescribed here in terms of a continuum field theory in the form of a nonlinearsigma model. We are thus in a position to carry out a complete calculation ofthe low-energy magnon spectrum for any strength of the applied field throughoutthe phase transition. In particular, our spin-wave analysis revealsfield-induced instabilities at two distinct critical fields H_1 and H_2 suchthat H_1 < H_c < H_2. Hence we predict the existence of an intermediate phasewhose detailed nature is also studied to some extent in the present paper.Comment: 15 pages, 11 figures, 2 table

physical review. b, condensed matter

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Intermediate phase in the spiral antiferromagnetBa2CuGe2O<…