Effect of Electron Correlations on Magnetic Excitations in the Isovalently Doped Iron-Based Superconductor Ba(Fe1-xRux)2As2

被引：17

作者：

Zhao, Jun ^{[1
,2
,3
,4
]}

Rotundu, C. R. ^{[5
]}

Marty, K. ^{[6
]}

Matsuda, M. ^{[6
]}

Zhao, Y. ^{[7
,8
]}

Setty, C. ^{[9
]}

Bourret-Courchesne, E. ^{[5
]}

Hu, Jiangping ^{[9
]}

Birgeneau, R. J. ^{[3
,10
]}

机构：

[1] Fudan Univ, Dept Phys, Shanghai 200433, Peoples R China

[2] Fudan Univ, State Key Lab Surface Phys, Adv Mat Lab, Shanghai 200433, Peoples R China

[3] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA

[4] Miller Inst Basic Res Sci, Berkeley, CA 94720 USA

[5] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Div Mat Sci, Berkeley, CA 94720 USA

[6] Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA

[7] NIST, Ctr Neutron Res, Gaithersburg, MD 20899 USA

[8] Univ Maryland, Dept Mat Sci & Engn, College Pk, MD 20742 USA

[9] Purdue Univ, Dept Phys, W Lafayette, IN 47907 USA

[10] Univ Calif Berkeley, Dept Mat Sci & Engn, Berkeley, CA 94720 USA

来源：

PHYSICAL REVIEW LETTERS | 2013年 / 110卷 / 14期

关键词：

D O I：

10.1103/PhysRevLett.110.147003

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Magnetic correlations in isovalently doped Ba(Fe1 - xRux)(2)As-2 (x = 0.25, T-c = 14.5 K; x = 0.35, T-c = 20 K) are studied by elastic and inelastic neutron scattering techniques. A relatively large superconducting spin gap accompanied by a weak resonance mode is observed in the superconducting state in both samples. In the normal state, the magnetic excitation intensity is dramatically reduced with increasing Ru doping toward the optimally doped regime. Our results favor that the weakening of the electron-electron correlations by Ru doping is responsible for the dampening of the resonance mode, as well as the suppression of the normal state antiferromagnetic correlations near the optimally doped regime in this system. DOI: 10.1103/PhysRevLett.110.147003

引用

页数：5

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