Quasi-two-dimensional metallic ground state of Ca3Ru2O7 -: art. no. 220411

We have succeeded in growing single crystals of Ca3Ru2O7 using a floating-zone method. The temperature dependence of the electrical resistivity establishes that Ca3Ru2O7 develops a quasi-two-dimensional metallic ground state below 30 K, from which the observed quantum oscillation derives. The temperature dependence of specific heat reveals the electronic specific-heat coefficient gamma to be as small as 1.7 mJ/Ru mol K-2. A qualitative difference exists between the field dependences of rho(ab) and rho(c). The field dependence of the resistivity at the metamagnetic transition around 6 T can be explained from the tunneling magnetoresistance.