Abstract
The compounds HoMo6S8 and (Er1−xSnx)Er4Rh6Sn18 (respectively, Ho-Mo-S and Er-Rh-Sn in the following) are known to be reentrant superconductors, the superconductivity being destroyed by the onset of long-range ferromagnetic order at low temperature. For the first time, the percolation of domain ‘‘walls’’ superconductivity has been produced below 0.2 K in Ho-Mo-S single crystals, confirming a systematic study of sintered samples and theoretical expectations. In addition, the ac susceptibility of Er-Rh-Sn single crystals, measured below 0.5 K, is large and positive for large ac fields and nearly equal to −1/4π for low ac fields. This fact confirms the existence of superconducting domain ‘‘walls’’ which screen the ac field.
Published Version
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