Interplay between quantum fluctuations and reentrant superconductivity with a highly enhanced upper critical field in URhGe
Interplay between quantum fluctuations and reentrant superconductivity with a highly enhanced upper critical field in URhGe
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URhGe 中量子涨落和重入超导性与高度增强的上临界场之间的相互作用
DOI：
10.1103/physrevb.93.201112
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
S. Araki
中科院分区：
文献类型：
--
作者：
Y. Tokunaga;D. Aoki;H. Mayaffre;S. Kramer;M. H. Julien;C. Berthier;M. Horvatic;H. Sakai;T. Hattori;S. Kambe;S. Araki
铁磁超导体URhGe的上临界场被限制在晶面内并在晶面内旋转时，会有极大的增强。我们对10%Co掺杂的URhGe进行了高达30 T的高场NMR测量，证明了超导性（SC）的这种非常规行为与三临界点附近场依赖量子涨落的强各向异性有关。这些波动被沿着轴的场分量迅速抑制，而不受沿沿着轴的任何场分量的影响。所观察到的SC和量子波动之间的密切相互作用强烈支持的配对机制介导的这些波动URhGe。
The ferromagnetic superconductor URhGe has been known to exhibit an extremely large enhancement of the upper critical field when the field is confined and rotated in thecrystal plane. Our high-fieldNMR measurements on 10% Co-doped URhGe up to 30 T prove that this unconventional behavior of the superconductivity (SC) is associated with a strong anisotropy of field-dependent quantum fluctuations near a tricritical point. These fluctuations are rapidly suppressed by the field component along theaxis, while being unaffected by any field component along theaxis. The observed close interplay between the SC and quantum fluctuations strongly supports a pairing mechanism mediated by these fluctuations in URhGe.