2014/10/31 by Kazuhei Wakiya, K. Wakiya, T. Onimaru +15 · 36 citations
Engineering · Materials Science · Mathematics · Physics and Astronomy · #Algorithm #Magnetic Properties of Alloys #Mathematics #Rare-earth and actinide compounds #Thermodynamic and Structural Properties of Metals and Alloys #cond-mat.mtrl-sci #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.93.064105
published in Physical review. B./Physical review. B 93(6) (American Physical Society) · 11pages, 4 figures
arxiv created 2015/11/04 · openalex publication_date 2016/02/09 · openalex created_date 2016/06/24 · arxiv updated 2017/05/18 · openalex updated_date 2026/08/05
We have investigated atomic dynamics of caged compound LaRu2Zn20 by the measurements of specific heat C and inelastic x-ray scattering (IXS). The lattice part of the specific heat Clat divided by T3,Clat/T3, shows a broad peak at around 15 K, which is reproduced by two Einstein modes with characteristic temperatures of \ensuremathθE1=35 K and \ensuremathθE2=82 K, respectively. IXS measurements along the [111] and [110] directions reveal weakly dispersive phonon modes at 3 meV (35 K) and 7 meV (80 K), respectively, whose values agree with the values of \ensuremathθE's. The first-principles calculation has assigned the 3 meV phonon modes as the optical modes of Zn atoms located at the middle of two La atoms, which is likely to lead to the structural instability.