Nb3Sn的上临界场与立方或四立方无关的证据
Evidence that the upper critical field of Nb3Sn is independent of whether it is cubic or tetragonal
摘要：
虽然2011年是Nb 3Sn作为第一个高场超导体的50周年，但对其上临界场行为μ 0 Hc 2的真正理解是不完整的。在这里，我们显示了令人惊讶的μ 0 Hc 2数据高度均匀的散装样品检查小电流，运输和体积平均比热和可逆磁化技术，表现出相同的上临界场μ 0 Hc 2（0.3 K）~ 29{ \pm } 0.2 T，有或没有经历立方到四立方的转变，这一结果与广泛使用的多源数据汇编形成强烈对比，该数据汇编显示在四重态下μ 0 Hc 2（0 K）从29 T到21.4 T的强烈降低。
英文摘要：
Although 2011 marks the 50th anniversary of Nb3Sn as the first high field superconductor, real understanding of its upper critical field behavior μ0Hc2 is incomplete. Here we show surprising μ0Hc2 data on highly homogeneous bulk samples examined both by small-current, transport and by volumetric-averaging specific heat and the reversible magnetization techniques, which exhibit identical upper critical field μ0Hc2(0.3 K) ~ 29{\pm} 0.2 T with or without undergoing the cubic to tetragonal transition, a result in strong contrast to widely used multiple-source data compilations that show a strong depression of μ0Hc2(0K) from 29 T to 21.4 T in the tetragonal state.
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