Lattice effects on ferromagnetism in perovskite ruthenates

Abstract

Ferromagnetism and its evolution in the orthorhombic perovskite system Sr1-xCaxRuO3 have been widely believed to correlate with the structural distortion. The recent development of high-pressure synthesis of the Ba substituted Sr1-yBayRuO3 makes it possible to study ferromagnetism over a broader phase diagram, which includes new orthorhombic Imma and the cubic phases. However, the chemical substitutions introduce the A-site disorder effect on Tc, which complicates determination of the relationship between ferromagnetism and the structural distortion. By clarifying the site disorder effect on Tc in several new series of ruthenates in which the average bond length <A-O> keeps the same, but the bond-length variance varies, we are able to demonstrate a parabolic curve of Tc versus mean bond length <A-O>. A much higher Tc ~ 177 K than that found in orthorhombic SrRuO3 can be obtained from the curve at a bond length <A-O> which makes the geometric factor t = <A-O>/(sqrt(2)<Ru-O>) = 1. This new result reveals not only that the ferromagnetism in the ruthenates is extremely sensitive to the lattice strain, but also that it has an important implication for exploring the structure-property relationship in a broad range of oxides with perovskite or perovskite-related structure.

References in corpus (2)

• Enhancement of the superconducting critical temperature in Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$ by controlling disorder outside CuO${}_2$ planes
• Structural and physical properties of $SrM{n}_{1-x}R{u}_x{O}_3$ perovskites

Cited by in corpus (9)

• Electronic correlations, magnetism and Hund's rule coupling in the ruthenium perovskites SrRuO${}_3$ and CaRuO${}_3$
• Revealing the Hidden Heavy Fermi Liquid in CaRuO3
• Long-range and local crystal structures of the Sr1-xCaxRuO3 Perovskites
• Epitaxial stabilization of metastable 3C BaRuO3 thin film with ferromagnetic non-Fermi liquid phase
• Crystalline symmetry-dependent magnon formation in itinerant ferromagnet SrRuO3
• Avoided quantum criticality and cluster-glass formation in itinerant ferromagnet Sr${}_{1-x}$(La${}_{0.5}$K${}_{0.5}$)${}_x$RuO${}_3$
• Tuning Structural, Transport and Magnetic Properties of Epitaxial SrRuO3 through Ba-Substitution
• Induced ferromagnetic moment at the interface between epitaxial SrRuO${}_3$ film and Sr${}_2$RuO${}_4$ single crystal
• Structure, Magnetism and First Principles Modeling of the Na0.5La0.5RuO3 Perovskite