Evidence for weak electronic correlations in iron pnictides

被引：177

作者：

Yang, W. L. ^{[1
]}

Sorini, A. P. ^{[2
]}

Chen, C-C. ^{[2
,3
]}

Moritz, B. ^{[2
]}

Lee, W-S ^{[2
]}

Vernay, F. ^{[4
]}

Olalde-Velasco, P. ^{[1
,5
]}

Denlinger, J. D. ^{[1
]}

Delley, B. ^{[4
]}

Chu, J-H ^{[2
,6
,7
]}

Analytis, J. G. ^{[2
,6
,7
]}

Fisher, I. R. ^{[2
,6
,7
]}

Ren, Z. A. ^{[8
]}

Yang, J. ^{[8
]}

Lu, W. ^{[8
]}

Zhao, Z. X. ^{[8
]}

van den Brink, J. ^{[2
,9
]}

Hussain, Z. ^{[1
]}

Shen, Z-X ^{[2
,3
,6
,7
]}

Devereaux, T. P. ^{[2
,7
]}

机构：

[1] Univ Calif Berkeley, Lawrence Berkeley Lab, Adv Light Source, Berkeley, CA 94720 USA

[2] SLAC Natl Accelerator Lab, Stanford Inst Mat & Energy Sci, Menlo Pk, CA 94025 USA

[3] Stanford Univ, Dept Phys, Stanford, CA 94305 USA

[4] Paul Scherrer Inst, Condensed Matter Theory Grp, CH-5232 Villigen, Switzerland

[5] Univ Nacl Autonoma Mexico, Inst Ciencias Nucl, Mexico City 04510, DF, Mexico

[6] Stanford Univ, Dept Appl Phys, Stanford, CA 94305 USA

[7] Stanford Univ, Geballe Lab Adv Mat, Stanford, CA 94305 USA

[8] Chinese Acad Sci, Inst Phys, Natl Lab Superconduct, Beijing 100080, Peoples R China

[9] Leiden Univ, Inst Lorentz Theoret Phys, NL-2300 RA Leiden, Netherlands

来源：

PHYSICAL REVIEW B | 2009年 / 80卷 / 01期

关键词：

barium compounds; density functional theory; electron correlations; Fermi level; Hubbard model; lanthanum compounds; samarium compounds; superconducting materials; X-ray absorption spectra; X-RAY-ABSORPTION; TRANSITION-METAL COMPOUNDS; SUM-RULES; SCATTERING; SPECTRA; FE;

D O I：

10.1103/PhysRevB.80.014508

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Using x-ray absorption (XAS) and resonant inelastic x-ray scattering (RIXS), charge dynamics at and near the Fe L edges is investigated in Fe-pnictide materials and contrasted to that measured in other Fe compounds. It is shown that the XAS and RIXS spectra for 122 and 1111 Fe pnictides are each qualitatively similar to Fe metal. Cluster diagonalization, multiplet, and density-functional calculations show that Coulomb correlations are much smaller than in the cuprates, highlighting the role of Fe metallicity and strong covalency in these materials. The best agreement with experiment is obtained using Hubbard parameters U less than or similar to 2 eV and J approximate to 0.8 eV.

引用

页数：10

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