Evidence of Strong Correlations and Coherence-Incoherence Crossover in the Iron Pnictide Superconductor KFe2As2

被引：147

作者：

Hardy, F. ^{[1
]}

Boehmer, A. E. ^{[1
]}

Aoki, D. ^{[2
,3
]}

Burger, P. ^{[1
]}

Wolf, T. ^{[1
]}

Schweiss, P. ^{[1
]}

Heid, R. ^{[1
]}

Adelmann, P. ^{[1
]}

Yao, Y. X. ^{[4
]}

Kotliar, G. ^{[5
]}

Schmalian, J. ^{[6
]}

Meingast, C. ^{[1
]}

机构：

[1] Karlsruher Inst Technol, Inst Festkorperphys, D-76021 Karlsruhe, Germany

[2] CEA Grenoble, INAC SPSMS, F-38054 Grenoble, France

[3] Tohoku Univ, IMR, Oarai, Ibaraki 3111313, Japan

[4] US DOE, Ames Lab, Ames, IA 50011 USA

[5] Rutgers State Univ, Dept Phys & Astron, Piscataway, NJ 08854 USA

[6] Karlsruher Inst Technol, Inst Theorie Kondensierten Mat, D-76128 Karlsruhe, Germany

来源：

PHYSICAL REVIEW LETTERS | 2013年 / 111卷 / 02期

关键词：

TRANSITION; HEAT;

D O I：

10.1103/PhysRevLett.111.027002

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Using resistivity, heat-capacity, thermal-expansion, and susceptibility measurements we study the normal-state behavior of KFe2As2. Both the Sommerfeld coefficient (gamma approximate to 103 mJ mol(-1) K-2) and the Pauli susceptibility (chi approximate to 4 x 10(-4)) are strongly enhanced, which confirm the existence of heavy quasiparticles inferred from previous de Haas-van Alphen and angle-resolved photoemission spectroscopy experiments. We discuss this large enhancement using a Gutzwiller slave-boson mean-field calculation, which shows the proximity of KFe2As2 to an orbital-selective Mott transition. The temperature dependence of the magnetic susceptibility and the thermal expansion provide strong experimental evidence for the existence of a coherence-incoherence crossover, similar to what is found in heavy fermion and ruthenate compounds, due to Hund's coupling between orbitals.

引用

页数：5

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