Anisotropic Kondo pseudogap in URu2Si2
Anisotropic Kondo pseudogap in URu2Si2
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DOI：
10.1103/physrevb.101.245103
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发表时间：
2018-05
影响因子：
3.7
通讯作者：
J. Buhot;J. Buhot;X. Montiel;Y. Gallais;M. Cazayous;A. Sacuto;G. Lapertot;Dai Aoki;N. Hussey;Claudine Lacroix;C. P'epin;S. Burdin;M. Measson;M. Measson
中科院分区：
文献类型：
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作者：
J. Buhot;J. Buhot;X. Montiel;Y. Gallais;M. Cazayous;A. Sacuto;G. Lapertot;Dai Aoki;N. Hussey;Claudine Lacroix;C. P'epin;S. Burdin;M. Measson;M. Measson
偏振电子拉曼散射研究表明，在Kondo交叉标度${T}_{K}\Ensureath{\sim}$100K以下，单晶{{mathm{uru}}_{2}{\mathm{Si}}_{2}的电子拉曼响应出现对称性依赖关系。主要在{E}_{g}通道中的相干Kondo赝隙的发展突出了${\mathm{uru}}_{2}{\mathrm{Si}}_{2}中的Kondo物理中的强各向异性，该各向异性以前在该系统的理论模型中被忽略，更广泛地被稀疏地处理在Kondo系统中。对拉曼顶点的计算表明，最强的拉曼顶点确实在能带间跃迁的{E}{g}}通道内发展，并在布里渊区的对角线上达到最大值，这意味着近藤赝隙具有$d$波状几何结构。这一普遍被忽视的性质可能会对这个系统的后续阶段的形成产生重要的影响，即隐藏有序和超导。
A polarized electronic Raman scattering study reveals the emergence of symmetry dependence in the electronic Raman response of single-crystalline ${\mathrm{URu}}_{2}{\mathrm{Si}}_{2}$ below the Kondo crossover scale ${T}_{K}\ensuremath{\sim}$ 100 K. In particular, the development of a coherent Kondo pseudogap predominantly in the ${E}_{g}$ channel highlights strong anisotropy in the Kondo physics in ${\mathrm{URu}}_{2}{\mathrm{Si}}_{2}$ that was previously neglected in theoretical models of this system and more generally has been sparsely treated for Kondo systems. A calculation of the Raman vertices demonstrates that the strongest Raman vertex does, indeed, develop within the ${E}_{g}$ channel for interband transitions and reaches a maximum along the diagonals of the Brillouin zone, implying a $d$-wave-like geometry for the Kondo pseudogap. This generally overlooked property may have important consequences on the formation of the subsequent phases of this system, namely, the hidden order and the superconductivity.