Boron isotope effect in superconducting MgB2
Boron isotope effect in superconducting MgB2
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DOI：
10.1103/physrevlett.86.1877
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发表时间：
2001-02-26
影响因子：
8.6
通讯作者：
Canfield, PC
中科院分区：
文献类型：
--
作者：
Bud'ko, SL;Lapertot, G;Canfield, PC
我们报道了 MgB2 的制备方法和硼同位素效应，这是一种新型二元金属间超导体，具有非常高的超导转变温度 T-c(B-10) = 40.2 K。温度依赖性磁化强度和比热的测量表明 (MgB2)-B-11 和 (MgB2)-B-10 之间的 T-c 存在 1.0 K 的偏移。尽管如此高的转变温度可能意味着奇异的耦合机制，但 MgB2 中的硼同位素效应与该材料作为声子介导的 BCS 超导体是一致的。
We report the preparation method of and boron isotope effect for MgB2, a new binary intermetallic superconductor with a remarkably high superconducting transition temperature T-c(B-10) = 40.2 K. Measurements of both temperature dependent magnetization and specific heat reveal a 1.0 K shift in T-c between (MgB2)-B-11 and (MgB2)-B-10. Whereas such a high transition temperature might imply exotic coupling mechanisms, the boron isotope effect in MgB2 is consistent with the material being a phonon-mediated BCS superconductor.