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A mean-field model explaining most of the details in the magnetic phasediagram of ErNi_2B_2C is presented. The low-temperature magnetic properties arefound to be dominated by the appearance of long-period commensurate structures.The stable structure at low temperatures and zero field is found to have aperiod of 40 layers along the a direction, and upon cooling it undergoes afirst-order transition at T_C = 2.3 K to a different 40-layered structurehaving a net ferromagnetic component of about 0.4 mu_B/Er. Theneutron-diffraction patterns predicted by the two 40-layered structures, aboveand below T_C, are in agreement with the observations of Choi et al.Comment: 4 pages, 3 figures (Revtex4

physical review. b, condensed matter

Mean-field model of the ferromagnetic ordering in the superconducting phase of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">ErNi</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">B</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mi mathvariant="normal">C</mml:mi></mml:math>

Mean-field model of the ferromagnetic ordering in the superconducting phase ofErNi2B2C