Suppression of superconductivity by antiferromagnetism in Tm2Fe3Si5

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 Tm2Fe3Si5. For pressures between 2 and 21 kbar, this system becomes superconducting at T/sub c/1>T/sub N/, with a subsequent reentrance to the normal conducting state at T/sub c/2≅T/sub 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