Abstract
The Na-based osmium oxide pyrochlore was synthesized for the first time by an ion-exchange method using KOs 2O 6 as a host. The composition was identified as Na 1.4Os 2O 6·H 2O by electron probe micro-analysis, thermogravimetric analysis, and structural analysis using synchrotron X-ray diffraction. Na 1.4Os 2O 6·H 2O crystallizes in a regular pyrochlore structure with some defects (space group: Fd-3 m, a=10.16851(1) Å). Electrical resistivity, heat capacity, and magnetization measurements clearly showed absence of superconductivity down to 2 K, being in large contrast to what was found for the β-type pyrochlore superconductor AOs 2O 6 ( A=Cs, Rb, and K). The Sommerfeld coefficient is 22 mJ K −2 mol −1, being the smallest among AOs 2O 6. A magnetic anomaly at ∼57 K and associated magneto-resistance (+3.7% at 2 K in 70 kOe) were found.
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.
