Abstract

Muon-spin-rotation and relaxation studies on single-crystalline Ho${\mathrm{Ni}}_{2}$${\mathrm{B}}_{2}$C show two magnetic phase transitions at ${T}_{N1}=6.0$ K and at ${T}_{N2}=5.0$ K. While the low-temperature phase displays a commensurate antiferromagnetic structure, the higher-temperature phase exhibits an incommensurately sinusoidal modulation of the spin amplitude. The nature of the incommensurate state, along with the causes of the reentrant superconductivity near 5 K, are discussed.

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