Abstract
We have investigated the structural, magnetic, and electronic properties of single-crystalline Sr 3- x Ca x Ru 2 O 7 (0 ≤ x ≤3) grown by a floating-zone method. The results of X-ray diffraction, magnetic susceptibility, specific heat, and electrical resistivity measurements reveal that this system shows a novel phase diagram. With increasing Ca content, the enhanced paramagnetism of Sr 3 Ru 2 O 7 is suppressed, and a phase with a ferromagnetic correlation (\(0.5 \lesssim x \lesssim 1.2\)) emerges. This phase adjoins an antiferromagnetic two-dimensional metallic phase (\(1.2 \lesssim x \leq 3.0\)). At the border between these two phases, discontinuous changes in the lattice parameters are observed. In the ferromagnetically correlated phase, the density of states is significantly enhanced. In the antiferromagnetic phase, the magnetic easy axis changes continuously from the c -axis to the a b -plane with increasing Ca content. These magnetic and electronic properties are strongly coupled with structural dist...
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