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

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

2004-04-16

arxiv.org/abs/cond-mat/0404376v1

J. Phys. Soc. Jpn. 73, 1647 (2004).

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 EPS figures, submitted to J. Phys. Soc. Jpn

Scientific paper

10.1143/JPSJ.73.1647

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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