Unusual heavy-mass nearly ferromagnetic state with a surprisingly large Wilson ratio in the double layered ruthenates (Sr${}_{1-x}$Ca${}_x$)${}_3$Ru${}_2$O${}_7$

Zhe Qu, Leonard Spinu, Huiqiu Yuan +9

We report an unusual nearly ferromagnetic, heavy-mass state with a surprisingly large Wilson ratio $R_{\text{w}}$ (e.g., $R_{\text{w}}\sim$ 700 for $x=$ 0.2) in double layered…