Abstract
Single crystal neutron diffraction techniques have been employed to study the evolution of magnetic structures in RNi2B2C compounds in an attempt to understand the relationship between magnetic ordering and superconductivity in several members of this series. For HoNi2B2C, below the superconducting transition (Tc = 8 K), an incommensurate magnetic structure characterized by two wave vectors (0.585 a* and 0.915 c*) is found in a narrow temperature range between 4.7 K and 6 K. This is the same temperature range where bulk measurements find a deep minimum in the upper critical field, Hc2. Below 4.7 K, HoNi2B2C is a simple collinear antiferromagnet. ErNi2B2C (Tc = 11 K) orders in an incommensurate modulated antiferromagnetic state characterized by an ordering wave vector 0.553 ā * below 7 K, which coexists with superconductivity.
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Stassis, C., Goldman, A.I., Dervenagas, P. et al. Magnetic Structures in RNi2B2C (R = Ho, Er) Superconductors. MRS Online Proceedings Library 376, 559–564 (1994). https://doi.org/10.1557/PROC-376-559
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DOI: https://doi.org/10.1557/PROC-376-559