@article{oai:kyutech.repo.nii.ac.jp:00005180,
 author = {Matsuhira, Kazuyuki and 松平, 和之 and Sekine,  Chihiro and Wakeshima,  Makoto and Hinatsu,  Yukio and Namiki,  Takahiro and Takeda,  Keiki and Shirotani,  Ichimin and Sugawara,  Hitoshi and Kikuchi,  Daisuke and Sato,  Hideyuki},
 issue = {12},
 journal = {Journal of the Physical Society of Japan},
 month = {Dec},
 note = {The lattice specific heat C lat of La-based filled skutterudites La T 4 X 12 ( T = Fe, Ru and Os; X = P, As, and Sb) has been systematically studied, and both the Debye temperature Θ D and the Einstein temperature Θ E of La T 4 X 12 were carefully estimated. We confirmed that a correlation exists between Θ D and the reciprocal of the square root of average atomic mass for La T 4 P 12 , La T 4 As 12 , and La T 4 Sb 12 . The Θ D of filled skutterudites was found to depend mainly on the nature of the species X forming the cage. The temperature dependence of C lat / T 3 for La T 4 X 12 exhibited a large broad maximum at low temperatures (10–30 K), which suggests a nearly dispersionless low-energy optical mode characterized by Einstein specific heat. Since no such broad maximum exists for the unfilled skutterudite RhP 3 , the low-energy optical modes are associated with vibration involving La ions in the X 12 cage (the so-called “guest ion modes”). The Θ E of filled skutterudites was found to roughly correspond to the energy of low-energy guest ion optical modes. Furthermore, a good correlation was shown to exist between Θ E and r R–X - r R3+ , where r R–X is the R – X distance and r R3+ is the effective ionic radius of R 3+ . As r R–X - r R3+ increased, Θ E was found to decrease.},
 pages = {124601--124601},
 title = {Systematic Study of Lattice Specific Heat of Filled Skutterudites},
 volume = {78},
 year = {2009},
 yomi = {マツヒラ, カズユキ}
}