Fermi surface of the intermetallic compound titanium-iron from the de Haas-van Alphen effect

A determination of the Fermi surface of TiFe by de Haas-van Alphen measurements is compared with the band-structure calculation of Papaconstantopoulos (a recent article). The principal Fermi-surface pieces predicted by that theory are seen experimentally. These are a hole-type surface located at the symmetry position $M$ of the simple-cubic Brillouin zone and having a volume of 4.9 × ${10}^{22}$ ${\mathrm{cm}}^{-3\mathrm{}}$, and an electron-type surface of equal volume located at $X$. This volume is about 2.7 times smaller than that of the predicted surfaces. The measured effective masses of the hole-type surface is $0.53m_e$, somewhat smaller than that predicted. The Dingle temperature of the specimen was about 7 K. Magnetization measurements indicate that small Fe clusters are created by individual iron atoms substitutional on titanium sites. The TiFe specimen can be characterized magnetically by a small saturation magnetization of 0.74 emu ${\mathrm{g}}^{-1\mathrm{}}$ and a field-independent susceptibility of about 4.7 × ${10}^{-6\mathrm{}}$ emu ${\mathrm{g}}^{-1\mathrm{}}$ ${\mathrm{Oe}}^{-1\mathrm{}}$. Above 20 mK it is neither ferromagnetic nor superconducting. Thus intrinsic TiFe is probably not magnetically ordered.