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New Superconducting and Magnetic Phases Emerge on the Verge of Antiferromagnetism in CeIn$_3$

Shinji Kawasaki·Takeshi Mito·Yu Kawasaki·Hisashi Kotegawa·Guo-qing Zheng·Yoshio Kitaoka·Hiroaki Shishido·Shingo Araki·Rikio Settai·Yoshichika Ōnuki
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Abstract

We report the discovery of new superconducting and novel magnetic phases in CeIn$_3$ 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 for a quantum phase transition in CeIn$_3$. A new type of superconductivity (SC) was found in $P=2.28-2.5$ GPa to coexist with AFM that 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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Shinji Kawasaki, Takeshi Mito, Yu Kawasaki, Hisashi Kotegawa, Guo-qing Zheng, Yoshio Kitaoka, Hiroaki Shishido, Shingo Araki, Rikio Settai, Yoshichika Ōnuki. 2004-04-16. New Superconducting and Magnetic Phases Emerge on the Verge of Antiferromagnetism in CeIn$_3$. https://doi.org/10.1143/jpsj.73.1647

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