Magnetic-field-induced superconductivity

The electrical resistance, $R$, of the pressure-induced superconductors ${\mathrm{Sn}}_x{\mathrm{Eu}}_{1.2-x}{\mathrm{Mo}}_6{\mathrm{S}}_8$ with $x=0.0\mathrm{} \mathrm{and} 0.12$ has been investigated as a function of magnetic field up to 17 T and at pressures up to 18 kbar. At the pressure where $T_c$ is a maximum, 14 kbar, a minimum is observed in the resistance versus field at temperatures below 4.2 K and for fields between 10 and 15 T. In particular, for the sample with $x=0\mathrm{}$, $R$ approaches 0 in this high-field region. At other pressures and for the other sample the anomaly is not as pronounced.