  Epitaxial strain in 4d ferromagnet SrRuO3 films is directly linked to the
physical properties through the strong coupling between lattices, electrons,
and spins. It provides an excellent opportunity to tune the functionalities of
SrRuO3 in electronic and spintronic devices. However, a thorough understanding
of the epitaxial strain effect in SrRuO3 has remained elusive due to the lack
of systematic studies. This study demonstrates wide-range epitaxial strain
control of electrical and magnetic properties in high-quality SrRuO3 films. The
epitaxial strain was imposed by cubic or pseudocubic perovskite substrates
having a lattice mismatch of -1.6 to 2.3% with reference to bulk SrRuO3. The
Poisson ratio, which describes the two orthogonal distortions due to the
substrate clamping effect, is estimated to be 0.33. The Curie temperature (TC)
and residual resistivity ratios of the series of films are higher than or
comparable to the highest reported values for SrRuO3 on each substrate,
confirming the high crystalline quality of the films. A TC of 169 K is achieved
in a tensile-strained SrRuO3 film on the DyScO3 (110) substrate, which is the
highest value ever reported for SrRuO3. The TC (146-169 K), magnetic anisotropy
(perpendicular or in-plane magnetic easy axis), and metallic conduction
(residual resistivity at 2 K of 2.10 - 373 {\mu}{\Omega}cm) of SrRuO3 are
widely controlled by epitaxial strain. These results provide guidelines to
design SrRuO3-based heterostructures for device applications.
