New Superconducting and Magnetic Phases Emerge on the Magnetic Criticality in CeIn<sub>3</sub>

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  • Kawasaki S.
    Department of Materials Science and Technology, Graduate School of Engineering Science, Osaka University
  • Mito T.
    Department of Materials Science and Technology, Graduate School of Engineering Science, Osaka University
  • Kawasaki Y.
    Department of Materials Science and Technology, Graduate School of Engineering Science, Osaka University
  • Kotegawa H.
    Department of Materials Science and Technology, Graduate School of Engineering Science, Osaka University
  • Zheng G.-Q.
    Department of Materials Science and Technology, Graduate School of Engineering Science, Osaka University
  • Kitaoka Y.
    Department of Materials Science and Technology, Graduate School of Engineering Science, Osaka University
  • Shishido H.
    Department of Physics, Graduate School of Science, Osaka University
  • Araki S.
    Department of Physics, Graduate School of Science, Osaka University
  • Settai R.
    Advanced Science Research Center, Japan Atomic Energy Research Institute
  • Onuki Y.
    Department of Physics, Graduate School of Science, Osaka University Advanced Science Research Center, Japan Atomic Energy Research Institute

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  • New Superconducting and Magnetic Phases Emerge on the Magnetic Criticality in CeIn3

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We report the discovery of new superconducting and novel magnetic phases in CeIn3 on the verge of antiferromagnetism (AFM) under pressure (P) through the In-nuclear quadrupole resonance (NQR) measurements. We have found a P-induced phase separation of AFM and paramagnetism (PM) without any trace of a quantum phase transition in CeIn3. A new type of superconductivity (SC) was found, under P=2.28–2.5 GPa, to coexist with AFM. It is magnetically separated from PM where the heavy fermion SC takes place. We propose that the magnetic excitations such as spin-density fluctuations induced by the first-order magnetic phase transition might mediate attractive interaction to form Cooper pairs.

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