Suppression of superconductivity by antiferromagnetism in ${\mathrm{Tm}}_2$${\mathrm{Fe}}_3$${\mathrm{Si}}_5$

Powder neutron-diffraction experiments at pressures up to 8.2 kbar and temperatures down to 0.3 K have been performed on the antiferromagnetic ternary compound ${\mathrm{Tm}}_2$ ${\mathrm{Fe}}_3$ ${\mathrm{Si}}_5$. For pressures between 2 and 21 kbar, this system becomes superconducting at $T_{c1\mathrm{}}>T_N$, with a subsequent reentrance to the normal conducting state at $T_{c2\mathrm{}}\approx T_N$. Our measurements demonstrate that the antiferromagnetic structure is unchanged under pressure, with no evidence for a ferromagnetic component at any pressure that would compete with the superconducting phase. This is the first experimental observation of the quenching of superconductivity by a purely antiferromagnetic state.