Charge excitation spectrum in UPt 3
Charge excitation spectrum in UPt 3
复制标题
UPt 3 中的电荷激发光谱
DOI：
10.1103/physrevb.65.205102
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发表时间：
2002
影响因子：
3.7
通讯作者：
G. Grüner
中科院分区：
文献类型：
--
作者：
P. Tran;S. Donovan;G. Grüner
我们报道了重费米子化合物${\ mathm {UPt}}_{3}在低温下观察到赝隙和零能模式。零能量模式可以用具有频率相关质量和弛豫率的扩展德鲁德响应来描述。如果使用通常的和规则参数，则该模式的谱权与超导穿透深度很好地吻合。赝隙能量，以$\ensuremath{\Elzxh}\ensuremath{\omega}{/k}_{B}为单位，$与磁相关产生的温度（约5k）相当。我们的发现表明，在这种材料中观察到的磁态与重费米子态的费米表面不稳定性有关。我们还比较了光学响应与其他具有磁性基态的重费米子化合物的电导率。
We report on the observation of a pseudogap, together with a zero-energy mode at low temperatures in the heavy fermion compound ${\mathrm{UPt}}_{3}.$ The zero-energy mode can be described by an extended Drude response with a frequency-dependent mass and relaxation rate. The spectral weight of this mode is in good agreement with the superconducting penetration depth if the usual sum rule arguments are used. The pseudogap energy, in units of $\ensuremath{\Elzxh}\ensuremath{\omega}{/k}_{B},$ is comparable to the temperature where the magnetic correlations develop (at approximately 5 K). Our findings indicate that the magnetic state observed in this material is related to a Fermi-surface instability of the heavy fermion state. We also compare the optical response to the conductivity observed in other heavy fermion compounds with a magnetic ground state.