1 Risø National Laboratory for Sustainable Energy, Technical University of Denmark2 unknown3 Department of Wind Energy, Technical University of Denmark4 Department of Physics, Technical University of Denmark
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