The magnetic phase diagram of the superconductor ErNi2B2C (T-c = 11 K and T-N = 6 K) has been studied by neutron diffraction as a function of temperature and magnetic field applied along the symmetry directions ,  and  of the tetragonal crystal structure. A series of commensurate magnetic structures, consistent with a transversely polarized spin-density wave with modulation vectors Q = n/ma* (0.55 less than or equal to n/m < 0.60) and the spins along b*, have been observed. The experimental data are compared with the results of a mean-field model that has been established from an analysis of bulk magnetization and zero-field neutron diffraction data. The model accounts for most of the observed features but fails to explain the occurrence of a small component Qdelta approximate to -0.005b* observed close to H-c2 when the field is applied along . (C) 2004 Elsevier B.V. All rights reserved.
Physica C: Superconductivity and Its Applications, 2004, Vol 408-410, p. 97-99
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7th International Conference on Materials and Mechanisms of Superconductivity and High Temperature Superconductors, 2004