Doping-enhanced antiferromagnetism in Ca1-xLaxFeAs2

Shinji Kawasaki, Tomosuke Mabuchi, Satoki Maeda, Tomoki Adachi, Tasuku Mizukami, Kazutaka Kudo, Minoru Nohara, Guo-Qing Zheng

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

In iron pnictides, high temperature superconductivity emerges after suppressing antiferromagnetism by doping. Here, we show that antiferromagnetism in Ca1-xLaxFeAs2 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.

Original languageEnglish
Article number180508
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume92
Issue number18
DOIs
Publication statusPublished - Nov 18 2015

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Antiferromagnetism
antiferromagnetism
Doping (additives)
Superconductivity
superconductivity
Iron
Nuclear quadrupole resonance
iron
Group 5A compounds
nuclear quadrupole resonance
Spin-lattice relaxation
spin-lattice relaxation
nuclear spin
Superconducting materials
Superconducting transition temperature
Phase diagrams
Physics
transition temperature
phase diagrams
Nuclear magnetic resonance

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

Doping-enhanced antiferromagnetism in Ca1-xLaxFeAs2. / Kawasaki, Shinji; Mabuchi, Tomosuke; Maeda, Satoki; Adachi, Tomoki; Mizukami, Tasuku; Kudo, Kazutaka; Nohara, Minoru; Zheng, Guo-Qing.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 92, No. 18, 180508, 18.11.2015.

Research output: Contribution to journalArticle

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