On the origin of heavy quasiparticles in LiV2O4
On the origin of heavy quasiparticles in LiV2O4
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DOI：
10.1209/epl/i2001-00322-3
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发表时间：
2001-06-01
期刊：
影响因子：
--
通讯作者：
Grin, Y
中科院分区：
文献类型：
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作者：
Fulde, P;Yaresko, AN;Grin, Y
对LiV2O4中的重准粒子激发提供了解释。它与其他已知的重费米子系统有很大的不同。我们的理论的主要成分是材料的立方尖晶石结构和d电子的强短程关联。大的伽马系数是由海森堡自旋1/2环和链的激发引起的。所需的耦合常数是从LDA+U计算中计算出来的，并且被发现具有合适的大小。同时，计算出的索末菲-威尔逊比也与观测到的相当接近。
An explanation is provided for the heavy quasiparticle excitations in LiV2O4. It differs considerably from that of other known heavy-fermion systems. Main ingredients of our theory are the cubic spinel structure of the material and strong short-range correlations of the d electrons. The large gamma coefficient is shown to result from excitations of Heisenberg spin 1/2 rings and chains. The required coupling constant is calculated from LDA+U calculations and is found to be of the right size. Also the calculated Sommerfeld-Wilson ratio is reasonably close to the observed one.