Dichotomy between Large Local and Small Ordered Magnetic Moments in Iron-Based Superconductors

被引：103

作者：

Hansmann, P. ^{[1
]}

Arita, R. ^{[2
,3
,4
]}

Toschi, A. ^{[1
]}

Sakai, S. ^{[1
]}

Sangiovanni, G. ^{[1
]}

Held, K. ^{[1
]}

机构：

[1] Vienna Univ Technol, Inst Solid State Phys, A-1040 Vienna, Austria

[2] Univ Tokyo, Dept Appl Phys, Tokyo 1138656, Japan

[3] TRIP, JST, Chiyoda Ku, Tokyo 1020075, Japan

[4] CREST, JST, Tokyo 1138656, Japan

来源：

PHYSICAL REVIEW LETTERS | 2010年 / 104卷 / 19期

基金：

奥地利科学基金会;

关键词：

ELECTRONIC-STRUCTURE CALCULATIONS; MEAN-FIELD THEORY; PNICTIDES;

D O I：

10.1103/PhysRevLett.104.197002

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We study a four-band model for iron-based superconductors within the local density approximation combined with dynamical mean-field theory (LDA + DMFT). This successfully reproduces the results of models which take As p degrees of freedom explicitly into account and has several physical advantages over the standard five d-band model. Our findings reveal that the new superconductors are more strongly correlated than their single-particle properties suggest. Two-particle correlation functions unveil the dichotomy between local and ordered magnetic moments in these systems, calling for further experiments to better resolve the short time scale spin dynamics.

引用

页数：4

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