2013/07/31 by J. -G. Cheng, Jinguang Cheng, Jun Zhou +3 · 1 citation
Chemistry · Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Bond length #Chemistry #Condensed matter physics #Crystal structure #Crystallography #Ferromagnetism #Lattice (music) #Magnetic and transport properties of perovskites and related materials #Materials science #Multiferroics and related materials #Orthorhombic crystal system #Perovskite (structure) #Phase (matter) #Phase diagram #Physics #cond-mat.mtrl-sci #cond-mat.str-el
paper · pdf · doi:10.1073/pnas.1311871110
published as PNAS 110, 13312 (2013)
openalex publication_date 2013/07/31 · arxiv created 2013/09/13 · arxiv updated 2015/06/17 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Ferromagnetism and its evolution in the orthorhombic perovskite system Sr(1-x)Ca(x)RuO3 have been widely believed to correlate with structural distortion. The recent development of high-pressure synthesis of the Ba-substituted Sr(1-y)Ba(y)RuO3 makes it possible to study ferromagnetism over a broader phase diagram, which includes the 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 structural distortion. By clarifying the site disorder effect on Tc in several unique series of ruthenates in which the average bond length <A-O> remains 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>/(√2<Ru-O>) ∼ 1. This 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 a perovskite-related structure.