Band-dependent emergence of heavy quasiparticles in CeCoIn5
Band-dependent emergence of heavy quasiparticles in CeCoIn5
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DOI：
10.1103/physrevb.88.035124
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发表时间：
2013-07-18
影响因子：
3.7
通讯作者：
Sarrao, J. L.
中科院分区：
文献类型：
--
作者：
Koitzsch, A.;Kim, T. K.;Sarrao, J. L.
用角分辨光电子能谱（ARPES）研究了重费米子超导体CeCoIn_5（Tc = 2.3K）的低温（T <2K）电子结构。导电电子和f电子之间的杂交，这最终导致出现的重准粒子负责这些材料的各种不寻常的性能，直接监测和显示是强烈的带依赖性。特别是最二维的带被发现是最不杂化的。一个简化的多波段版本的周期性安德森模型（PAM）被用来描述的数据，导致半定量协议与以前的体积敏感的结果从德哈斯-范阿尔芬测量。
We investigate the low temperature (T < 2 K) electronic structure of the heavy fermion superconductor CeCoIn5 (T-c = 2.3 K) by angle- resolved photoemission spectroscopy (ARPES). The hybridization between conduction electrons and f electrons, which ultimately leads to the emergence of heavy quasiparticles responsible for the various unusual properties of such materials, is directly monitored and shown to be strongly band dependent. In particular the most two-dimensional band is found to be the least hybridized one. A simplified multiband version of the periodic Anderson model (PAM) is used to describe the data, resulting in semiquantitative agreement with previous bulk sensitive results from de Haas-van Alphen measurements.