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首页> 外文期刊>Physica, B. Condensed Matter >Neutron scattering study on CuV2S4 and CuTi2S4
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Neutron scattering study on CuV2S4 and CuTi2S4

机译：CuV2S4和CuTi2S4的中子散射研究

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The metallic thiospinel CuV2S4 shows an enhanced value of the low-temperature specific heat with gamma = C/T approximate to 60 mJ/mol K-2, suggesting magnetic or electronic correlations. To elucidate the nature of this low-temperature phase with respect to possible magnetic fluctuations, inelastic neutron scattering measurements were performed on polycrystalline CUV2S4 and CuTi2S4. Both compounds show an inelastic response dominated by phonons. The low-energy phonon response of CuTi2S4 is centered around 13 meV and depends only weakly on temperature. The corresponding phonon intensity in the low energy transfer region of CuV2S4 is centered at around 6 meV (T = 120 K). The center of gravity of this intensity shifts to about 10 meV (T = 1.8 K) below the structural phase transition at T approximate to 90 K The significant difference in the low-energy phonon response between both compounds, which display the same lattice symmetry at 120 K, and the strong renormalization of the phonon energies below the structural transition might reflect the influence of strong electron-phonon coupling in CUV2S4. (c) 2006 Elsevier B.V. All rights reserved.
机译：金属化的硫代吡啶1 CuV2S4在γ= C / T约为60 mJ / mol K-2的情况下显示出较低的低温比热值，表明存在磁性或电子相关性。为了阐明该低温相相对于可能的磁波动的性质，对多晶CUV2S4和CuTi2S4进行了非弹性中子散射测量。两种化合物均表现出以声子为主的非弹性反应。 CuTi2S4的低能声子响应以13 meV为中心，并且仅微弱地依赖于温度。 CuV2S4的低能传递区域中的相应声子强度以6 meV（T = 120 K）为中心。该强度的重心在T处的结构相变以下大约90 K处移动到约10 meV（T = 1.8 K）左右。两种化合物之间的低能声子响应的显着差异，在处显示相同的晶格对称120 K，并且声子能量在结构转变以下的强烈重整化可能反映了CUV2S4中强电子-声子耦合的影响。 （c）2006 Elsevier B.V.保留所有权利。

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