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Pressure-induced superconductivity and large upper critical field in the noncentrosymmetric antiferromagnet CeIrGe_3

机译:非中心对称反铁磁体CeIrGe_3中的压力感应超导和较大的上临界场

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We report on the discovery of superconductivity in the noncentrosymmetric antiferromagnet CeIrGe_3 below 1.5 K at a pressure of 20 GPa. We performed electrical resistivity measurements in single crystals of CeIrGe_3 in the temperature range 0.04-300 K at pressures up to 24 GPa. From these measurements we deduced the P-T phase diagram. The data imply a crossover from localized to itinerant 4f electrons of the type caused by a Kondo-lattice phenomenon as pressure increases. The antiferromagnetic phase weakens with pressure and eventually vanishes above 22 GPa, indicative of the occurrence of a quantum critical point. Superconductivity appears inside the antiferromagnetic phase near this critical point. After the disappearance of the magnetic ordering a non-Fermi-liquid behavior is observed. Resistivity measurements taken at 24 GPa in magnetic fields up to 8 T strongly suggest that CeIrGe_3 has a very large upper critical field for H||[001].
机译:我们报告了在20 GPa压力下1.5 K以下非中心对称反铁磁体CeIrGe_3中超导性的发现。我们在0.024-300 K的温度范围内,压力高达24 GPa的CeIrGe_3单晶中进行了电阻率测量。从这些测量中,我们推导出了P-T相图。数据表明,随着压力增加,由近藤晶格现象引起的从局域4f型电子到局域性4f电子的交叉。反铁磁相随压力而减弱,并最终在22 GPa以上消失,表明出现了量子临界点。在此临界点附近,反铁磁相内部会出现超导现象。在磁序消失之后,观察到非费米液体的行为。在高达8 T的磁场中以24 GPa进行的电阻率测量强烈表明,CeIrGe_3的H || [001]具有非常大的上临界场。

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