Magnetic ground state of superconducting Eu(Fe0.88Ir0.12)2As2: A combined neutron diffraction and first-principles calculation study

被引：30

作者：

Jin, W. T. ^{[1
,2
,3
]}

Li, Wei ^{[4
,5
]}

Su, Y. ^{[3
]}

Nandi, S. ^{[1
,2
,3
]}

Xiao, Y. ^{[1
,2
]}

Jiao, W. H. ^{[6
]}

Meven, M. ^{[3
,7
]}

Sazonov, A. P. ^{[3
,7
]}

Feng, E. ^{[3
]}

Chen, Yan ^{[8
,9
]}

Ting, C. S. ^{[10
,11
]}

Cao, G. H. ^{[12
]}

Brueckel, Th. ^{[1
,2
,3
]}

机构：

[1] Forschungszentrum Julich, JCNS, D-52425 Julich, Germany

[2] Forschungszentrum Julich, JARA FIT, PGI, D-52425 Julich, Germany

[3] Forschungszentrum Julich, JCNS, Outstn MLZ, D-85747 Garching, Germany

[4] Chinese Acad Sci, State Key Lab Funct Mat Informat, Shanghai 200050, Peoples R China

[5] Chinese Acad Sci, Shanghai Ctr Superconduct, Shanghai Inst Microsyst & Informat Technol, Shanghai 200050, Peoples R China

[6] Zhejiang Univ Sci & Technol, Sch Sci, Hangzhou 310023, Zhejiang, Peoples R China

[7] Rhein Westfal TH Aachen, Inst Kristallog, D-52056 Aachen, Germany

[8] Fudan Univ, Dept Phys, State Key Lab Surface Phys, Shanghai 200433, Peoples R China

[9] Fudan Univ, Adv Mat Lab, Shanghai 200433, Peoples R China

[10] Univ Houston, Texas Ctr Superconduct, Houston, TX 77204 USA

[11] Univ Houston, Dept Phys, Houston, TX 77204 USA

[12] Zhejiang Univ, Dept Phys, Hangzhou 310027, Zhejiang, Peoples R China

来源：

PHYSICAL REVIEW B | 2015年 / 91卷 / 06期

基金：

中国国家自然科学基金;

关键词：

D O I：

10.1103/PhysRevB.91.064506

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The magnetic order of the localized Eu2+ spins in optimally doped Eu(Fe1-xIrx)(2)As-2 (x = 0.12) with superconducting transition temperature T-SC = 22 K was investigated by single-crystal neutron diffraction. The Eu2+ moments were found to be ferromagnetically aligned along the c direction with an ordered moment of 7.0(1) mu(B) well below the magnetic phase transition temperature T-C = 17 K. No evidence of the tetragonal-to-orthorhombic structural phase transition was found in this compound within the experimental uncertainty, in which the spin-density-wave (SDW) order of the Fe sublattice is supposed to be completely suppressed and the superconductivity gets fully developed. The ferromagnetic ground state of the Eu2+ spins in Eu(Fe0.88Ir0.12)(2)As-2 was supported by the first-principles density functional calculation. In addition, comparison of the electronic structure calculations between Eu(Fe0.875Ir0.125)(2)As-2 and the parent compound EuFe2As2 indicates stronger hybridization and more expanded bandwidth due to the Ir substitution, which together with the introduction of electrons might work against the Fe-SDW in favor of the superconductivity.

引用

页数：7

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