Enhancing the superconducting transition temperature of the heavy fermion compound CeIrIn5 in the absence of spin correlations.
Enhancing the superconducting transition temperature of the heavy fermion compound CeIrIn5 in the absence of spin correlations.
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DOI：
10.1103/physrevlett.94.037007
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发表时间：
2004-12
影响因子：
8.6
通讯作者：
S. Kawasaki;G. Zheng;Hiroki Kan;Y. Kitaoka;H. Shishido;Y. Ōnuki
中科院分区：
文献类型：
--
作者：
S. Kawasaki;G. Zheng;Hiroki Kan;Y. Kitaoka;H. Shishido;Y. Ōnuki
本文报道了通过（115）In核自旋晶格弛豫率测量的CeIrIn（5）中压力（P-）诱导的超导性和自旋关联的演化。我们发现，施加压力抑制显着的反铁磁波动，是在环境压力下很强。在P = 2.1GPa时，T（c）增加到T（c）= 0.8K，是费米液态背景下T（c）（P = 0 GPa）的两倍。这与之前的情况形成鲜明对比，在之前的情况下，负的化学压力（用Rh取代Ir）增强了磁相互作用并增加了T（c）。我们的研究结果表明，多种机制在同一化合物CeIrIn中产生超导性（5）。
We report on a pressure- (P-)induced evolution of superconductivity and spin correlations in CeIrIn(5) via the (115)In nuclear-spin-lattice-relaxation rate measurements. We find that applying pressure suppresses dramatically the antiferromagnetic fluctuations that are strong at ambient pressure. At P = 2.1 GPa, T(c) increases to T(c) = 0.8 K, which is twice T(c) (P = 0 GPa), in the background of Fermi-liquid state. This is in sharp contrast to the previous case in which a negative, chemical pressure (replacing Ir with Rh) enhances magnetic interaction and increases T(c). Our results suggest that multiple mechanisms work to produce superconductivity in the same compound CeIrIn(5).