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Transition-metal oxides offer an opportunity to explore unconventionalsuperconductors, where the superconductivity (SC) is often interrelated withnovel phenomena such as spin/charge order, fluctuations, and Fermi surfaceinstability (1-3). LiTi2O4 (LTO) is a unique compound in that it is the onlyknown spinel oxide superconductor. In addition to electron-phonon coupling,electron-electron and spin fluctuation contributions have been suggested asplaying important roles in the microscopic mechanism for its superconductivity(4-8). However, the lack of high quality single crystals has thus far preventedsystematic investigation of their transport properties (9). Here, we report acareful study of transport and tunneling spectroscopy in epitaxial LTO thinfilms. In the superconducting state, the energy gap was found to decrease as aquadratic function of magnetic field. In the normal state, an unusualmagnetoresistance (MR) was observed where it changes from anisotropic positiveto isotropic negative as the temperature is increased. A constant chargecarrier concentration without any abrupt change in lattice parameters as afunction of temperature suggests that the isotropic MR stems from thesuppression of spin scattering/fluctuations, while the anisotropic termoriginates from an orbital contribution. These observations point to animportant role strong correlations play in this unique superconductor.

Anomalous magnetoresistance in the spinel superconductor LiTi2O4