Diverse quantum phenomena have been observed in TSn 4 transition metal (T) stannides, including superconductivity, nontrivial topology, and large magnetoresistance at low temperatures. Here, we report the experimental and theoretical investigation of tetragonal β-IrSn 4 (space group I4 1 /acd) with the lattice parameters a = 6.362(3) Å and c = 22.723(0) Å. The temperature dependence of the electrical resistivity indicates that β-IrSn 4 is a good metal with Fermi-liquid behavior above the superconducting transition at T c ~ 0.7 K. Magnetic susceptibility measurements indicate it is non-magnetic. However, positive transverse magnetoresistance (MR) with linear field dependence is observed. At T = 2 K and H = 14 T, the MR reaches 700% without sign of saturation. Shubnikov-de Haas (SdH) oscillations are observed from proximity detector oscillator (PDO) measurements up to 60 T. We experimentally extract several frequencies, and through comparison to first-principles calculations, identify corresponding electronic bands. For H // c, two strong oscillations, F 1 109 and F 2 302 T, allow us to determine effective masses 0.266m 0 and 0.300m 0 (m 0 is the free-electron mass), respectively. The topology of these bands is discussed.
Speer et al. (Thu,) studied this question.