Abstract
The magnetic phase diagram for Mg 1− x Zn x C y Ni 3 has been tentatively constructed based on magnetization and muon spin relaxation ( μSR) measurements. The superconducting phase was observed to fade as x ( y) increases (decreases). The low y samples show early stages of long-range ferromagnetism, or complete long-range ferromagnetism. In the phase diagram, the ferromagnetic phase exists in addition to the superconducting phase, suggesting that there is some correlation between superconductivity and ferromagnetism, even though the coexistence of ferromagnetism and superconductivity is not observed from the μSR measurements down to 20 mK for the superconducting sample ( T c=2.5 K, ( x, y)=(0, 0.9)).
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