International Conference on Strongly Correlated Electron Systems 2014 | |
Interplay between low-energy optical phonon modes and structural transition in PrT2Zn20 (T=Ru and Ir) | |
Wakiya, K.^1 ; Onimaru, T.^1 ; Tsutsui, S.^2,3 ; Matsumoto, K.T.^1 ; Nagasawa, N.^1 ; Baron, A.Q.R.^2,4 ; Hasegawa, T.^5 ; Ogita, N.^5 ; Udagawa, M.^3,5 ; Takabatake, T.^1,3 | |
Department of Quantum Matter, Graduate School of Advanced Sciences of Matter, Hiroshima University, Higashi-Hiroshima | |
739-8530, Japan^1 | |
Japan Synchrotron Radiation Research Institute, SPring-8, Sayo, Hyogo | |
679-5198, Japan^2 | |
Institute for Advanced Materials Research, Hiroshima University, Higashi-Hiroshima | |
739-8530, Japan^3 | |
Materials Dynamics Laboratory, RIKEN SPring-8 Center, Sayo, Hyogo | |
679-5148, Japan^4 | |
Graduate School of Integrated Arts and Sciences, Hiroshima University, Higashi-Hiroshima | |
739-8521, Japan^5 | |
关键词: Atomic dynamics; First-principles calculation; Inelastic x-ray scattering; Isostructural; Low energy optical phonon modes; Low-energy vibrations; Optical phonons; Structural transitions; | |
Others : https://iopscience.iop.org/article/10.1088/1742-6596/592/1/012024/pdf DOI : 10.1088/1742-6596/592/1/012024 |
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来源: IOP | |
【 摘 要 】
Atomic dynamics of PrT2Zn20for T=Ru with a structural transition at Ts=138 K and T=Ir without such a transition have been studied by inelastic X-ray scattering (IXS) measurements. The IXS spectra for T=Ru reveal an optical phonon excitation at 3 meV. We assign it to low-energy vibration of the Zn atom at the 16c site by taking account of the first principles calculation [Hasegawa et al. 2012 J. Phys.: Conf. Proc. 391 012016]. For T=Ir, on the other hand, the optical excitation at 3 meV was not observed. The contrasting results indicate that the low-energy optical phonon mode has a role in the structural transition in PrRu2Zn20and isostructural La counterparts.
【 预 览 】
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