Field-induced incommensurate-to-commensurate transition in Ba_2CuGe_2O_7

Details Field-induced incommensurate-to-commensurate transition in Ba_2CuGe_2O_7 Field-induced incommensurate-to-commensurate transition in Ba_2CuGe_2O_7

1997-06-13

arxiv.org/abs/cond-mat/9706146v1

Phys. Rev. B 57, 2968 (1998).

Physics

Condensed Matter

Strongly Correlated Electrons

11 double column pages, 9 figures, submitted to PRB

Scientific paper

10.1103/PhysRevB.57.2968

We report an observation of a commensurate-incommensurate phase transition in the Dzyaloshinskii-Moriya spiral antiferromagnet Ba_2 Cu Ge_2 O_7. The transition is induced by an external magnetic field applied along the c-axis of the tetragonal structure, i. e., in the plane of spin rotation. Bulk magnetic measurements and neutron diffraction experiments show that the transition occurs in a critical field Hc=2.1T. Experimental results for the period of the magnetic structure and magnetization as functions of magnetic field are in quantitative agreement with our exact analytical solution for Dzyaloshinskii's model of commensurate-incommensurate transitions in spiral magnets.

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