Abstract
The effect of Ru substitution for Ti on the ground-state properties of three-dimensional antiferromagnet (AF) ${\text{CaCu}}_{3}{\text{Ti}}_{4}{\text{O}}_{12}$ is studied by means of magnetic susceptibility and heat-capacity measurements. A small amount of Ru substituted for Ti suppresses AF long-range order and induces a new intermediate state with ${T}^{2}$-proportional heat capacity, which shows a clear contrast to a simple spin-dilution effect demonstrated by the Zn substitution for Cu. Ru substitution also creates a finite density of state at the Fermi level while keeping nominal valence of Cu ions to be $2+$, which is essential to a novel insulator-to-metal crossover driven by an isovalent substitution of ${\text{Ru}}^{4+}$ for ${\text{Ti}}^{4+}$.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
