Visualization of ferromagnetic domains in TbNi${}_2$B${}_2$C and ErNi${}_2$B${}_2$C single crystals: Weak ferromagnetism and its coexistence with superconductivity

Abstract

The magnetic flux structure in the basal plane, (001), of single crystals of superconducting (R = Er) and non-superconducting (R = Tb) RNi${}_2$B${}_2$C was studied by high resolution Bitter decoration at temperatures below $T_c$ (superconducting transition) and/or $T_N$ (antiferromagnetic transition). For both materials two sets of domain boundaries, in \{110\} and \{100\} planes, were observed. The temperature ranges in which the \{100\} domain boundaries were observed in TbNi${}_2$B${}_2$C and ErNi${}_2$B${}_2$C coincide with the weak ferromagnetic (WFM) ordering in these materials. On the other hand, the \{110\} twin boundaries - the antiferromagnetic domain boundaries - were observed in both compounds below $T_N$. The possibility of interpretation of \{100\} boundaries as Bloch domain walls in the weakly ferromagnetic phase, for $T<T_{WFM}<T_N$ (TbNi${}_2$B${}_2$C) or $T<T_{WFM}<T_N<T_c$ (ErNi${}_2$B${}_2$C) is discussed.

References in corpus (1)

• Elastic domains in antiferromagnets

Cited by in corpus (2)

• Prediction of polaron-like vortices and dissociation depinning transition in magnetic superconductors: The example of ErNi2B2C
• Coexistence of Long-Range Magnetic Order and Superconductivity from Campbell Penetration Depth Measurements