Interplay between exchange interactions and charging effects in metallic grains

被引：2
|
作者：
San-Jose, P.
Herrero, C. P.
Guinea, F.
Arovas, D. P.
机构：
[1] Univ Karlsruhe, Inst Theoret Festkorperphys, D-76128 Karlsruhe, Germany
[2] Univ Karlsruhe, DFG, Ctr Funct Nanostruct, D-76128 Karlsruhe, Germany
[3] CSIC, Inst Ciencia Mat Madrid, E-28049 Madrid, Spain
[4] Univ Calif San Diego, Dept Phys, La Jolla, CA 92093 USA
来源：
EUROPEAN PHYSICAL JOURNAL B | 2006年 / 54卷 / 03期
关键词：
D O I：
10.1140/epjb/e2006-00453-9
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
We study the effect of strong antiferromagnetic exchange interactions in metallic grains in the Coulomb blockade regime. These interactions can be large in superconducting systems or in metallic antiferromagnetic particles. We extend the standard description of the grain in terms of a single collective variable, the charge and its conjugated phase, to include the spin degree of freedom. The suppression of spin fluctuations enhances the tendency towards Coulomb blockade. The effective charging energy and conductance are calculated numerically in the regime of large grain-lead coupling.
引用
收藏
页码：309 / 314
页数：6
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