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Field-induced magnetic phases in the normal and superconducting states of ErNi2B2C

Jensen, A; Toft, KN; Abrahamsen, AB; McMorrow, DF; Eskildsen, MR; Andersen, NH; ... Canfield, PC; + view all (2004) Field-induced magnetic phases in the normal and superconducting states of ErNi2B2C. PHYS REV B , 69 (10) , Article 104527. 10.1103/PhysRevB.69.104527.

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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.

Type:Article
Title:Field-induced magnetic phases in the normal and superconducting states of ErNi2B2C
DOI:10.1103/PhysRevB.69.104527
Keywords:SINGLE-CRYSTAL, TRANSITIONS, HOLMIUM, DIAGRAM, ER
UCL classification:UCL > School of BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology

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