Pressure dependence of the upper critical field of the heavy fermion superconductor UBe13
Pressure dependence of the upper critical field of the heavy fermion superconductor UBe13
复制标题
重费米子超导体 UBe13 上临界场的压力依赖性
DOI：
10.1103/physrevlett.82.169
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发表时间：
1999
影响因子：
8.6
通讯作者：
F. Thomas
中科院分区：
文献类型：
--
作者：
L. Glémot;J. Brison;J. Flouquet;A. Buzdin;I. Sheikin;D. Jaccard;C. Thessieu;F. Thomas
我们报告了重费米子超导体 UBe 13 上临界场压力下的测量结果。仅用一个任意参数即可一致地实现简单强耦合模型框架中的解释：强耦合常数 λ。我们发现 UBe 13 处于极强耦合状态，并且 λ 随压力的变化解释了正常相和超导相热力学性质的压力依赖性。它揭示了质量重正化和配对机制之间的强烈相互作用，首次定量表明超导体中非声子介导的配对。
We report measurements under pressure of the upper critical field of the heavy fermion superconductor UBe 13. An interpretation in the framework of a simple strong coupling model is achieved consistently with only one arbitrary parameter: the strong coupling constant λ. We find that UBe 13 is in an extreme strong coupling regime and that the variation of λ with pressure explains the pressure dependence of the thermodynamic properties of both the normal and the superconducting phases. It reveals a strong interplay between the mass renormalization and the pairing mechanisms, yielding the first quantitative indication of a nonphonon mediated pairing in a superconductor.