Figure 1

Electric transport properties in Ca₂RuO₄ nanofilm crystals. (a) Powder X-ray diffraction patterns at room temperature for Ca₂RuO₄. (b) Temperature dependence of the longitudinal resistivity ρ for Ca₂RuO₄ nanofilm crystals. Dependence of the magnetic susceptibility M/H on temperature in an FC process of 10 Oe for powders weighing 5.2 mg (sample A). (c) Temperature dependence of ρ at 10 nA for samples 1 and 3 when the magnetic field is applied parallel to the c axis. Dependence of M/H on temperature in 7 T for sample A. (d) I − V characteristics in various magnetic fields for sample 3. Supercurrent was observed. (e) Dependence of the critical current I_c on temperature in B = 0. The blue solid and dotted lines represent fitting results for the critical current in chiral p-wave and s-wave states, respectively. The inset shows I − V characteristics for various temperatures in sample 3. Hysteresis behaviour was observed in the low bias current region. Numbered arrows represent the bias current direction.