Abstract
By use of synchrotron radiation, powder x-ray diffraction of the superconducting skuttetudites YT4P12 (T = Fe, Ru and Os) has been studied at high pressures. The d-values of many diffraction lines decreased monotonically with increasing pressure up to 10 GPa. New diffraction lines did not appear up to 10 GPa although the diffraction lines shifted and the width broadened with increasing pressure. The bulk moduli of these compounds were estimated from the volume vs. pressure curves fitted by a Birch equation of state. The bulk moduli of the superconducting skutterudites were 144 GPa for YFe4P12, 183 GPa for YRu4P12 and 189 GPa for YOs4P12. The bulk modulus of these skutterudites increased with increasing lattice constant. The similar results were also obtained for LaT4P12 (T = Fe, Ru and Os). The superconducting transition temperature (Tc) of YT4P12 (T = Fe, Ru and Os) is 7 K, 8.5 K and 3 K, respectively. YRu4P12 has the highest Tc among three skutterudites. The linear relation between Tc and bulk modulus is not found for the superconducting skutterudites YT4P12 (T = Fe, Ru and Os).
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