Superconductivity of Ce-based heavy fermions under pressure: Valence fluctuation mediated pairing associated with valence instability of Ce
Superconductivity of Ce-based heavy fermions under pressure: Valence fluctuation mediated pairing associated with valence instability of Ce
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DOI：
10.1016/s0921-4526(98)00754-6
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发表时间：
1999-01-01
影响因子：
2.8
通讯作者：
Onishi, Y
中科院分区：
文献类型：
--
作者：
Miyake, K;Narikiyo, O;Onishi, Y
本文认为，CeCu2-Ge(2)的剩余电阻率峰值与超导转变温度在压力下的重合可以理解为伴随着价态的快速变化而增强的价态涨落现象，其信号表现为电阻率T(2)项的系数A迅速减小。由这种情形预测的第二类库珀配对可能不同于由反铁磁自旋涨落所介导的库珀配对。在等结构化合物CeCu(2)Si(2)和CeNi(2)Ge(2)中观察到的压力下的超导电性应该平行理解。(C)1999 Elsevier Science B.V.保留所有权利。
It is argued that the coincidence of peaks of the residual resistivity and the superconducting transition temperature observed in CeCu(2)Ge(2) under pressure can be understood as a phenomenon of enhanced valence fluctuations associated with rapid valence change which is signaled by rapid decrease of the coefficient A of T(2)-term of the resistivity. ii type of Cooper pairing predicted by this scenario can be different from that mediated by the antiferromagnetic spin fluctuations. The superconductivity observed in isostructural compounds, CeCu(2)Si(2) and CeNi(2)Ge(2), under pressure should be understood in parallel. (C) 1999 Elsevier Science B.V. All rights reserved.