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Title: Coexistence of Ferromagnetic and Stripe Antiferromagnetic Spin Fluctuations in SrCo 2 As 2

Abstract

We use inelastic neutron scattering to study energy and wave vector dependence of spin fluctuations in SrCo 2As 2, derived from SrFe 2-xCo xAs 2 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 SrCo 2As 2 are closely associated with a flatband of the e g orbitals near the Fermi level, different from the t 2g orbitals in superconducting SrFe 2-xCoxAs 2. Therefore, Co substitution in SrFe 2-xCo xAs 2 induces a t 2g to e g orbital switching, and is responsible for FM spin fluctuations detrimental to the singlet pairing superconductivity.

Authors:
 [1];  [2];  [3];  [4];  [2];  [4];  [2];  [3];  [3]; ORCiD logo [5]; ORCiD logo [5];  [6];  [6]; ORCiD logo [5]; ORCiD logo [5];  [7];  [8];  [9];  [1]
  1. Rice Univ., Houston, TX (United States); Beijing Normal Univ. (China)
  2. Beijing Normal Univ. (China)
  3. Chinese Academy of Sciences (CAS), Shanghai (China)
  4. Rice Univ., Houston, TX (United States)
  5. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  6. Science and Technology Facilities Council (STFC), Oxford (United Kingdom). Rutherford Appleton Lab., ISIS Neutron Source
  7. Commissariat a l'Energie Atomique et aux Energies Alternatives (CEA-Saclay), Gif-sur-Yvette (France)
  8. Inst. Laue-Langevin (ILL), Grenoble (France)
  9. Julich Research Centre (Germany). Julich Centre for Neutron Science (JCNS)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1509529
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 122; Journal Issue: 11; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Li, Yu, Yin, Zhiping, Liu, Zhonghao, Wang, Weiyi, Xu, Zhuang, Song, Yu, Tian, Long, Huang, Yaobo, Shen, Dawei, Abernathy, Douglas L., Niedziela, Jennifer L., Ewings, Russell A., Perring, T. G., Pajerowski, Daniel M., Matsuda, Masaaki, Bourges, Philippe, Mechthild, Enderle, Su, Yixi, and Dai, Pengcheng. Coexistence of Ferromagnetic and Stripe Antiferromagnetic Spin Fluctuations in SrCo2As2. United States: N. p., 2019. Web. doi:10.1103/PhysRevLett.122.117204.
Li, Yu, Yin, Zhiping, Liu, Zhonghao, Wang, Weiyi, Xu, Zhuang, Song, Yu, Tian, Long, Huang, Yaobo, Shen, Dawei, Abernathy, Douglas L., Niedziela, Jennifer L., Ewings, Russell A., Perring, T. G., Pajerowski, Daniel M., Matsuda, Masaaki, Bourges, Philippe, Mechthild, Enderle, Su, Yixi, & Dai, Pengcheng. Coexistence of Ferromagnetic and Stripe Antiferromagnetic Spin Fluctuations in SrCo2As2. United States. doi:10.1103/PhysRevLett.122.117204.
Li, Yu, Yin, Zhiping, Liu, Zhonghao, Wang, Weiyi, Xu, Zhuang, Song, Yu, Tian, Long, Huang, Yaobo, Shen, Dawei, Abernathy, Douglas L., Niedziela, Jennifer L., Ewings, Russell A., Perring, T. G., Pajerowski, Daniel M., Matsuda, Masaaki, Bourges, Philippe, Mechthild, Enderle, Su, Yixi, and Dai, Pengcheng. Thu . "Coexistence of Ferromagnetic and Stripe Antiferromagnetic Spin Fluctuations in SrCo2As2". United States. doi:10.1103/PhysRevLett.122.117204.
@article{osti_1509529,
title = {Coexistence of Ferromagnetic and Stripe Antiferromagnetic Spin Fluctuations in SrCo2As2},
author = {Li, Yu and Yin, Zhiping and Liu, Zhonghao and Wang, Weiyi and Xu, Zhuang and Song, Yu and Tian, Long and Huang, Yaobo and Shen, Dawei and Abernathy, Douglas L. and Niedziela, Jennifer L. and Ewings, Russell A. and Perring, T. G. and Pajerowski, Daniel M. and Matsuda, Masaaki and Bourges, Philippe and Mechthild, Enderle and Su, Yixi and Dai, Pengcheng},
abstractNote = {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 QAF=(1,0) and QFM=(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 eg orbitals near the Fermi level, different from the t2g orbitals in superconducting SrFe2-xCoxAs2. Therefore, Co substitution in SrFe2-xCoxAs2 induces a t2g to eg orbital switching, and is responsible for FM spin fluctuations detrimental to the singlet pairing superconductivity.},
doi = {10.1103/PhysRevLett.122.117204},
journal = {Physical Review Letters},
number = 11,
volume = 122,
place = {United States},
year = {2019},
month = {3}
}

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This content will become publicly available on March 21, 2020
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