Evolution of superconductivity and antiferromagnetic order in Ba(Fe0.92xCo0.08Vx)2As2

Jieming Sheng, Xingguang Li, Congkuan Tian, Jianming Song, Xin Li, Guangai Sun, Tianlong Xia, Jinchen Wang, Juanjuan Liu, Daye Xu, Hongxia Zhang, Xin Tong, Wei Luo, Liusuo Wu, Wei Bao, and Peng Cheng
Phys. Rev. B 101, 174516 – Published 28 May 2020

Abstract

The vanadium doping effects on the superconductivity and magnetism of iron pnictides are investigated in Ba(Fe0.92xCo0.08Vx)2As2 by transport, susceptibility, and neutron scattering measurements. The doping of magnetic impurity V causes a fast suppression of superconductivity with TC reduced at a rate of approximately 7.4 K/1% V. On the other hand, for x0.02, long-range C-type antiferromagnetic order is recovered upon V doping, in contrast to the x=0 sample with no detectable magnetic order. The value of ordered magnetic moments of Ba(Fe0.92xCo0.08Vx)2As2 follows a domelike evolution versus doping concentration x. A possible Griffiths-type antiferromagnetic region of multiple coexisting phases in the phase diagram of Ba(Fe0.92xCo0.08Vx)2As2 is identified, in accordance with previous theoretical predictions based on the cooperative behavior of magnetic impurities and conduction electrons mediating the Ruderman-Kittel-Kasuya-Yosida interactions between them.

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  • Received 28 January 2020
  • Revised 12 April 2020
  • Accepted 30 April 2020

DOI:https://doi.org/10.1103/PhysRevB.101.174516

©2020 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Jieming Sheng1,2,3,4, Xingguang Li1, Congkuan Tian1, Jianming Song5, Xin Li5, Guangai Sun5, Tianlong Xia1, Jinchen Wang1, Juanjuan Liu1, Daye Xu1, Hongxia Zhang1, Xin Tong2,3, Wei Luo2,3, Liusuo Wu4, Wei Bao1,6, and Peng Cheng1,*

  • 1Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials & Micro-nano Devices, Renmin University of China, Beijing 100872, People's Republic of China
  • 2Institute of High Energy Physics, Chinese Academy of Sciences (CAS), Beijing 100049, People's Republic of China
  • 3Spallation Neutron Source Science Center, Dongguan 523803, People's Republic of China
  • 4Department of Physics, Southern University of Science and Technology, Shenzhen 518055, People's Republic of China
  • 5Key Laboratory of Neutron Physics and Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang 621999, People's Republic of China
  • 6Department of Physics, City University of Hong Kong, Kowloon, Hong Kong SAR, People's Republic of China

  • *pcheng@ruc.edu.cn

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Vol. 101, Iss. 17 — 1 May 2020

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