Evolution of4felectron states in the metal-insulator transition ofPrRu4P12

Evolution of4felectron states in the metal-insulator transition ofPrRu4P12
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PrRu4P12金属-绝缘体转变中4f电子态的演化

DOI:
10.1103/physrevb.72.024414
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发表时间:
2005
期刊:
影响因子:
3.7
通讯作者:
T. Sakakibara
T. Sakakibara
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
K. Iwasa;L. Hao;K. Kuwahara;M. Kohgi;S. Saha;H. Sugawara;Y. Aoki;H. Sato;T. Tayama;T. Sakakibara

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用非弹性中子散射实验研究了在${T}_{\mathrm{M}\text{\ensuremath{-}}\mathrm{I} =63\phantom{\rule{0.3em}{0ex}}\mathrm{K}$处出现金属-绝缘体跃迁(M-I)跃迁的填充方钨矿$\mathrm{Pr}{\mathrm{Ru}}_{4}{\mathrm{P}}_{12}$的磁激发。在远低于${T}_{\mathrm{M}\text{\ensuremath{-}}\mathrm{I}}$的温度下,光谱被描述为定义良好的晶体场激发。在接近${T}_{\mathrm{M}\text{\ensuremath{-}}\mathrm{I}}$时,随着载流子数和跃迁原子位移的温度变化,激发峰变宽并发生明显的位移。$4f$电子态通过$p\text{\ensuremath{-}}f$在${T}_{\mathrm{M}\text{\ensuremath{-}}\mathrm{I}}$附近的混合,从绝缘体相的良好定域态演变为强杂化的流动态。杂化负责$\ mathm {Pr}{\ mathm {Ru}}_{4}{\ mathm {P}}_{12}$的M-I跃迁。
Magnetic excitations of the filled skutterudite $\mathrm{Pr}{\mathrm{Ru}}_{4}{\mathrm{P}}_{12}$ exhibiting a metal-insulator (M-I) transition at ${T}_{\mathrm{M}\text{\ensuremath{-}}\mathrm{I}}=63\phantom{\rule{0.3em}{0ex}}\mathrm{K}$ were studied by inelastic neutron scattering experiment. The spectra at temperatures much lower than ${T}_{\mathrm{M}\text{\ensuremath{-}}\mathrm{I}}$ are described as well-defined crystal-field excitations. With approaching ${T}_{\mathrm{M}\text{\ensuremath{-}}\mathrm{I}}$, the excitation peaks broaden and shift considerably together with the temperature variation of the carrier number and the atomic displacement in the transition. The $4f$ electron states evolve from the well-localized state in the insulator phase to the strongly hybridized itinerant state by $p\text{\ensuremath{-}}f$ mixing near ${T}_{\mathrm{M}\text{\ensuremath{-}}\mathrm{I}}$. The hybridization is responsible for the M-I transition of $\mathrm{Pr}{\mathrm{Ru}}_{4}{\mathrm{P}}_{12}$.
通过 X 射线衍射研究金属-绝缘体过渡体系 PrRu4P12 的晶格调制
DOI: --
发表时间: 2004
期刊: Journal of Magnetism and Magnetic Materials 272-276
影响因子: --
作者:
L.Hao;K.Iwasa;K.Kuwahara;M.Kohgi;S.R.Saha;et al.
通讯作者: et al.
C.H.Lee:“金属-绝缘体过渡化合物 PrRu_4P_<12> 低温晶体结构的研究”J.Magn.Magn.Mater.. (2004)
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