2006 年 75 巻 4 号 p. 043703
We report the discovery of pressure-induced superconductivity in an antiferromagnet CeIrSi3, which lacks inversion symmetry in the tetragonal crystal structure. The Néel temperature TN=5.0 K at ambient pressure decreases monotonically with increasing pressure, and becomes zero at about 2.5 GPa. Superconductivity appears in a wide pressure region from 1.8 GPa to about 3.5 GPa, with a relatively large superconduting transition temperature Tsc=1.6 K and a large upper critical field Hc2(0)=11.1 T at 2.5 GPa, indicating heavy-fermion superconductivity.
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