Field-induced magnetic phases in the normal and superconducting states of ErNi2B2C
Date
2004-03-01
Authors
Jensen, A.
Toft, K. N.
Abrahamsen, A. B.
McMorrow, D. F.
Eskildsen, M. R.
Andersen, N. H.
Jensen, J.
Hedegard, P.
Klenke, J.
Danilkin, S.
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American Physical Society
Abstract
We present a comprehensive neutron-diffraction study of the magnetic structures of ErNi2B2C in the presence of a magnetic field applied along [010], [110], or [001]. In zero field, the antiferromagnetic structure is transversely polarized with Qapproximate to0.55a* and the moments along the b direction. At the lowest temperatures, the modulation is close to a square wave, and transitions of Q between different commensurable values are observed when varying the field. The commensurable structures are analyzed in terms of a detailed mean-field model. Experimentally, the minority domain shows no hysteresis and stays stable up to a field close to the upper critical field of superconductivity, when the field is applied along [010]. Except for this possible effect, the influences of the superconducting electrons on the magnetic structures are not directly visible. Another peculiarity is that Q rotates by a small, but clearly detectable, angle of about 0.5degrees away from the [100] and the field direction, when the field is applied along [110] and is approximately equal to or larger than the upper critical field.
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Comments
This article is published as Jensen, A., K. Nørgaard Toft, A. B. Abrahamsen, D. F. McMorrow, M. R. Eskildsen, N. H. Andersen, J. Jensen et al. "Field-induced magnetic phases in the normal and superconducting states of ErNi 2 B 2 C." Physical Review B 69, no. 10 (2004): 104527.
DOI: 10.1103/PhysRevB.69.104527.
Copyright 2004 American Physical Society.
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