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Doping-enhanced antiferromagnetism in Ca1xLaxFeAs2

Shinji Kawasaki, Tomosuke Mabuchi, Satoki Maeda, Tomoki Adachi, Tasuku Mizukami, Kazutaka Kudo, Minoru Nohara, and Guo-qing Zheng
Phys. Rev. B 92, 180508(R) – Published 18 November 2015
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Abstract

In iron pnictides, high temperature superconductivity emerges after suppressing antiferromagnetism by doping. Here, we show that antiferromagnetism in Ca1xLaxFeAs2 is robust against and even enhanced by doping. Using As75-nuclear magnetic resonance and nuclear quadrupole resonance techniques, we find that an antiferromagnetic order occurs below the Néel temperature TN=62 K at a high doping concentration (x=0.15) where superconductivity sets in at the transition temperature Tc=35 K. In the superconducting state coexisting with antiferromagnetism, the nuclear-spin-lattice relaxation rate 1/T1 becomes proportional to T, indicating gapless excitations. Unexpectedly, TN is enhanced with increasing doping, rising up to TN=70 K at x=0.24. The obtained phase diagram of this system enriches the physics of iron-based high-Tc superconductors.

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  • Received 25 May 2015
  • Revised 29 October 2015

DOI:https://doi.org/10.1103/PhysRevB.92.180508

©2015 American Physical Society

Authors & Affiliations

Shinji Kawasaki1, Tomosuke Mabuchi1, Satoki Maeda1, Tomoki Adachi1, Tasuku Mizukami1, Kazutaka Kudo1, Minoru Nohara1, and Guo-qing Zheng1,2

  • 1Department of Physics, and Research Center of New Functional Materials for Energy Production, Storage and Transport, Okayama University, Okayama 700-8530, Japan
  • 2Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100190, China

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Issue

Vol. 92, Iss. 18 — 1 November 2015

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