Abstract
We have succeeded in synthesizing samples of new filled skutterudite compound BaOs4P12 using the high-pressure synthesis technique. The physical properties of the compound are reported for the first time. The electrical resistivity decreases with decreasing temperature, and drop sharply around 1.8K. This indicates that BaOs4P12 is a new superconductor. Before the high-pressure synthesis, using synchrotron radiation x-ray, we tried to observe synthesizing processes of BaOs4P12 in-situ at high temperature and high pressure to obtain the optimum condition for synthesis.
Highlights
IntroductionThe d electrons of Fe, Ru and Os atoms should play important roles in the physical properties
Filled skutterudite compounds AT4X12 (A = alkali metal, alkaline earth metal, lanthanide (Ln), and actinide; T = Fe, Ru, Os, and Pt; X = P, As, Sb, and Ge) crystallize in a body-centered cubic structure with a space group Im3̅ (T 5h, No 204) [1]
The results of in-situ x-ray diffraction experiments are shown in figure 1
Summary
The d electrons of Fe, Ru and Os atoms should play important roles in the physical properties. Matsuoka et al reported that filled skutterudite compounds including alkaline earth metal AFe4Sb12 (A = Ca, Sr, and Ba) have revealed strong ferromagnetic spin fluctuations of the Fe 3d electrons and the properties of nearly ferromagnetic metals [5]. AOs4Sb12 (A=Sr, Ba) show the character of enhanced Pauli paramagnets where Os 5d electrons play important roles [6]. Only preliminary studies have been conducted on the properties of P and As-based compounds including alkaline earth metal because the compounds are quite difficult to prepare. We focused on P-based filled skutterudite compounds including alkaline earth metal as part of our search for new materials using a high-pressure synthesis technique
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