Visualization of ferromagnetic domains in ErNi2B2C single crystals: Weak ferromagnetism and its coexistence with superconductivity

TitleVisualization of ferromagnetic domains in ErNi2B2C single crystals: Weak ferromagnetism and its coexistence with superconductivity
Publication TypeJournal Article
Year of Publication2007
AuthorsVeschunov IS, Vinnikov LY, Bud'ko SL, Canfield PC
Journal TitlePhysical Review B
Volume76
Pages174506
Date PublishedNov
Type of ArticleArticle
ISBN Number1098-0121
Accession NumberISI:000251326600108
Keywordsborocarbides, magnetic superconductors, TBNI2B2C
Abstract

The magnetic flux structure in the basal plane, (001), of single crystals of superconducting ErNi2B2C was studied by high resolution Bitter decoration at temperatures below T-c (superconducting transition) and/or T-N (antiferromagnetic transition). Two sets of domain boundaries, in {110} and {100} planes, were observed. The temperature range in which the {100} domain boundaries were observed coincides with the weak ferromagnetic (WFM) ordering in this material. On the other hand, the {110} twin boundaries-the antiferromagnetic domain boundaries-were observed below T-N. For comparison, TbNi2B2C, the related compound with higher magnetic ordering temperatures but no superconductivity, was also studied. The possibility of interpretation of {100} boundaries as Bloch domain walls in the weakly ferromagnetic phase, for T < T-WFM < T-N (TbNi2B2C) or T < T-WFM < T-N < T-c (ErNi2B2C), is discussed.

DOI10.1103/PhysRevB.76.174506
Alternate JournalPhys. Rev. B