Kondo resonance in the neutron spectra of intermediate-valent YbAl3.
Kondo resonance in the neutron spectra of intermediate-valent YbAl3.
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中价 YbAl3 中子谱中的近藤共振。
DOI：
10.1103/physrevb.43.320
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发表时间：
1991
期刊：
影响因子：
--
通讯作者：
Fisk
中科院分区：
文献类型：
--
作者：
Walter;Holland;Fisk
用冷中子散射法测定了中价YbAl{sub 3}的动态磁化率。我们发现两个低于40兆电子伏的强磁激发。其中一个在氦温度下的位置约为18mev，随着温度的升高稳步向0 meV移动。虽然晶体场相互作用无法解释这种行为，但这种激发与安德森模型所描述的从{ital f}基态到近藤共振的转变非常吻合。特别是，它绝对排除了前面断言的隙宽{Delta}=30 meV的类隙磁响应。
We have measured the dynamic susceptibility of intermediate-valent YbAl{sub 3} by means of cold-neutron scattering. We find two intense magnetic excitations below 40 meV. One of these, with location around 18 meV at helium temperatures, shifts steadily toward 0 meV with increasing temperatures. While crystal field interactions are unable to account for such a behavior, this excitation is in good agreement with a transition from the {ital f} ground state to a Kondo resonance as described by the Anderson model. In particular, it definitely excludes a gaplike magnetic response with gap width {Delta}=30 meV as asserted earlier.