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Thermodynamic and transport properties of Sr$_{1-x}$Ca$_x$RuO$_3$ with acalcium concentration $x \geq 0.8$ were investigated at low temperatures and inexternal magnetic field. The investgations revealed a Landau Fermi liquid (LFL)behaviour characterized by specific heat $C/T = const$ and resistivity$\rho\sim T^2$ and an anomalous non-Fermi liquid (NFL) behaviour with $\rho\sim T^{5/3}$ and a quasi-logarithmic increase of $C/T$ with decreasingtemperature. The $T$--$x$ and $T$--$B$ phase diagrams which separate bothregions were prepared for the investigated materials. Then, the experimentalbehaviour of $C/T$ and $\rho(T)$ were compared with predictions of theself-consistent renormalization (SCR) theory of spin fluctuations. Within thisapproach, $C/T(T)$ was well described up to 20 K. The SCR parameters $y_0$,$y_1$ and $T_0$ inferred from specific heat analysis allowed to describeproperly $\rho(T)$ up to approximately 5 K. In addition, the resistivity datawere analysed within the `hidden Fermi liquid' theory of Anderson, obtainingvery good descritption of the experimental behaviour up to about 25 K. Ananomalous increase of the $C/T$ ratio already in the LFL region below 2 K invery weak magnetic fields (0.2--0.3 T) was identified as caused by the Schottkyanomaly induced by ferromagnetic clusters embodied into the essentiallyparamagnetic materials.

Investigation of anomalous thermodynamic and transport properties of Sr$_{1-x}$Ca$_x$RuO$_3$ ($x \geq 0.8$)