Coexistence of Ferromagnetic and Stripe Antiferromagnetic Spin Fluctuations in SrCo2As2

被引：27

作者：

Li, Yu ^{[1
,2
]}

Yin, Zhiping ^{[2
]}

Liu, Zhonghao ^{[3
,4
]}

Wang, Weiyi ^{[1
]}

Xu, Zhuang ^{[2
]}

Song, Yu ^{[1
]}

Tian, Long ^{[2
]}

Huang, Yaobo ^{[5
]}

Shen, Dawei ^{[3
,4
]}

Abernathy, D. L. ^{[6
]}

Niedziela, J. L. ^{[6
]}

Ewings, R. A. ^{[7
]}

Perring, T. G. ^{[7
]}

Pajerowski, Daniel M. ^{[6
]}

Matsuda, Masaaki ^{[6
]}

Bourges, Philippe ^{[8
]}

Mechthild, Enderle ^{[9
]}

Su, Yixi ^{[10
]}

Dai, Pengcheng ^{[1
,2
]}

机构：

[1] Rice Univ, Dept Phys & Astron, Houston, TX 77005 USA

[2] Beijing Normal Univ, Dept Phys, Beijing 100875, Peoples R China

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

[4] Chinese Acad Sci, Ctr Excellence Superconducting Elect, SIMIT, Shanghai 200050, Peoples R China

[5] Chinese Acad Sci, Shanghai Inst Appl Phys, Shanghai Synchrotron Radiat Facil, Shanghai 201204, Peoples R China

[6] Oak Ridge Natl Lab, Neutron Scattering Div, Oak Ridge, TN 37831 USA

[7] STFC Rutherford Appleton Lab, ISIS Pulsed Neutron & Muon Source, Didcot OX11 0QX, Oxon, England

[8] Univ Paris Saclay, CEA Saclay, CEA CNRS, Lab Leon Brillouin, F-91191 Gif Sur Yvette, France

[9] Inst Laue Langevin, 6 Rue Jules Horowitz,Boite Postale 156, F-38042 Grenoble 9, France

[10] Forschungszentrum Julich, Heinz Maier Leibnitz Zentrum MLZ, JCNS, Lichtenbergstr 1, D-85747 Garching, Germany

来源：

PHYSICAL REVIEW LETTERS | 2019年 / 122卷 / 11期

基金：

英国科学技术设施理事会;

关键词：

IRON PNICTIDES; SUPERCONDUCTIVITY; DYNAMICS; BEHAVIOR;

D O I：

10.1103/PhysRevLett.122.117204

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We use inelastic neutron scattering to study energy and wave vector dependence of spin fluctuations in SrCo2As2, derived from SrFe2-xCoxAs2 iron pnictide superconductors. Our data reveal the coexistence of antiferromagnetic (AF) and ferromagnetic ( FM) spin fluctuations at wave vectors Q(AF) = (1, 0) and Q(FM) = (0, 0)/(2, 0), respectively. By comparing neutron scattering results with those of dynamic mean field theory calculation and angle- resolved photoemission spectroscopy experiments, we conclude that both AF and FM spin fluctuations in SrCo2As2 are closely associated with a flatband of the e(g) orbitals near the Fermi level, different from the t(2g) orbitals in superconducting SrFe2-xCoxAs2. Therefore, Co substitution in SrFe2-xCoxAs2 induces a t(2g) to e(g) orbital switching, and is responsible for FM spin fluctuations detrimental to the singlet pairing superconductivity.

引用

页数：6

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