Mean-field model of the ferromagnetic ordering in the superconducting phase of ErNi_2B_2C

Details Mean-field model of the ferromagnetic ordering in the superconducting phase of ErNi_2B_2C Mean-field model of the ferromagnetic ordering in the superconducting phase of ErNi_2B_2C

2002-01-09

arxiv.org/abs/cond-mat/0201133v1

Physics

Condensed Matter

4 pages, 3 figures (Revtex4)

Scientific paper

10.1103/PhysRevB.65.140514

A mean-field model explaining most of the details in the magnetic phase diagram of ErNi_2B_2C is presented. The low-temperature magnetic properties are found to be dominated by the appearance of long-period commensurate structures. The stable structure at low temperatures and zero field is found to have a period of 40 layers along the a direction, and upon cooling it undergoes a first-order transition at T_C = 2.3 K to a different 40-layered structure having a net ferromagnetic component of about 0.4 mu_B/Er. The neutron-diffraction patterns predicted by the two 40-layered structures, above and below T_C, are in agreement with the observations of Choi et al.

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