Nonadiabatic effects of rattling phonons and 4f excitations in Pr(Os1-xRux)4Sb12

被引：5
|
作者：
Thalmeier, Peter [1 ]
机构：
[1] Max Planck Inst Chem Phys Solids, D-01187 Dresden, Germany
来源：
PHYSICAL REVIEW B | 2010年 / 81卷 / 22期
关键词：
CRYSTAL; FIELDS; STATE;
D O I：
10.1103/PhysRevB.81.224305
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
In the skutterudite compounds the anharmonic "rattling" oscillations of 4f-guest ions in the surrounding Sb-12 host cages are found to have significant influence on the low-temperature properties. Recently specific-heat analysis of Pr(Os1-xRux)4Sb(12) has shown that the energy of crystalline electric field singlet-triplet excitations increases strongly with Ru concentration x and crosses the almost constant rattling mode frequency omega(0) at about x similar or equal to 0.65. Due to magnetoelastic interactions this may entail prominent nonadiabatic effects in inelastic neutron-scattering intensity and quadrupolar susceptibility. Furthermore the Ru-concentration dependence of the superconducting T-c, notably the minimum at intermediate x is explained as a crossover effect from pair-forming aspherical Coulomb scattering to pair-breaking exchange scattering.
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页数：9
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