Low-energy optical phonon modes in the caged compound
K Wakiya, T Onimaru, S Tsutsui, T Hasegawa… - Physical Review B, 2016 - APS
K Wakiya, T Onimaru, S Tsutsui, T Hasegawa, KT Matsumoto, N Nagasawa, AQR Baron…
Physical Review B, 2016•APSWe have investigated atomic dynamics of caged compound LaRu 2 Zn 20 by the
measurements of specific heat C and inelastic x-ray scattering (IXS). The lattice part of the
specific heat C lat divided by T 3, C lat/T 3, shows a broad peak at around 15 K, which is
reproduced by two Einstein modes with characteristic temperatures of θ E 1= 35 K and θ E
2= 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 …
measurements of specific heat C and inelastic x-ray scattering (IXS). The lattice part of the
specific heat C lat divided by T 3, C lat/T 3, shows a broad peak at around 15 K, which is
reproduced by two Einstein modes with characteristic temperatures of θ E 1= 35 K and θ E
2= 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 …
We have investigated atomic dynamics of caged compound by the measurements of specific heat and inelastic x-ray scattering (IXS). The lattice part of the specific heat divided by , shows a broad peak at around 15 K, which is reproduced by two Einstein modes with characteristic temperatures of K and 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 '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.
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