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We report an observation of a commensurate-incommensurate phase transition inthe Dzyaloshinskii-Moriya spiral antiferromagnet Ba_2 Cu Ge_2 O_7. Thetransition is induced by an external magnetic field applied along the c-axis ofthe tetragonal structure, i. e., in the plane of spin rotation. Bulk magneticmeasurements and neutron diffraction experiments show that the transitionoccurs in a critical field Hc=2.1T. Experimental results for the period of themagnetic structure and magnetization as functions of magnetic field are inquantitative agreement with our exact analytical solution for Dzyaloshinskii'smodel of commensurate-incommensurate transitions in spiral magnets.Comment: 11 double column pages, 9 figures, submitted to PR

physical review. b, condensed matter

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Field-induced incommensurate-to-commensurate transition inBa2CuGe2O<…