Thermal conductivity evidence for a dx2-y2 pairing symmetry in the heavy-fermion CeIrIn5 superconductor.
Thermal conductivity evidence for a dx2-y2 pairing symmetry in the heavy-fermion CeIrIn5 superconductor.
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DOI：
10.1103/physrevlett.100.207003
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发表时间：
2007-12
影响因子：
8.6
通讯作者：
Y. Kasahara;T. Iwasawa;Y. Shimizu;Hiroaki Shishido;T. Shibauchi;I. Vekhter;Yuji Matsuda
中科院分区：
文献类型：
--
作者：
Y. Kasahara;T. Iwasawa;Y. Shimizu;Hiroaki Shishido;T. Shibauchi;I. Vekhter;Yuji Matsuda
准二维Ce（Ir，Rh）In 5系统的相图包含两个不同的超导圆顶。通过在旋转磁场H中的热输运测量，我们将CeIrIn 5的超导能隙结构固定在第二个圆顶中，该第二个圆顶位于远离第一个圆顶的反铁磁量子临界点附近。当H在ab平面内旋转时，观察到明显的四重振荡，而在bc平面内没有观察到振荡。与以前的报道形成鲜明对比的是，我们的结果是最符合dx 2-y2对称性，这意味着在第二阶段的超导性也是由反铁磁自旋涨落介导的。
The phase diagram of the quasi-2D Ce(Ir,Rh)In5 system contains two distinct superconducting domes. By the thermal transport measurements in rotating magnetic fields H, we pinned down the superconducting gap structure of CeIrIn5 in the second dome, located distant from the first dome in proximity to an antiferromagnetic quantum critical point. Clear fourfold oscillation was observed when H is rotated within the ab plane, while no oscillation was observed within the bc plane. In sharp contrast to previous reports, our results are most consistent with dx2-y2 symmetry, implying that the superconductivity in the second phase is also mediated by antiferromagnetic spin fluctuations.