超净URu $_2$ Si $_2$超导体中磁通线晶格熔化和相干准粒子Bloch态的形成
Flux Line Lattice Melting and the Formation of a Coherent Quasiparticle Bloch State in the Ultraclean URu$_2$Si$_2$ Superconductor
摘要：
我们发现，在超净重费米子超导体URu $_2$ Si $_2$（$T_{c0}=1.45$ K）中，在平均场上临界场之下，发生了一个明显的磁通线晶格熔化相变。我们表明，在这个系统中的一个非常小的数量的载体与重质量的结果在异常大的热波动，即使在亚开尔文温度下，这是见证了相当大的区域的通量线液相。的独特性进一步突出的增强的准粒子的平均自由程低于熔化过渡，这意味着可能形成的准粒子布洛赫状态的周期性磁通线晶格。
英文摘要：
We find that in ultraclean heavy-fermion superconductor URu$_2$Si$_2$ ($T_{c0}=1.45$ K) a distinct flux line lattice melting transition with outstanding characters occurs well below the mean-field upper critical fields. We show that a very small number of carriers with heavy mass in this system results in exceptionally large thermal fluctuations even at subkelvin temperatures, which are witnessed by a sizable region of the flux line liquid phase. The uniqueness is further highlighted by an enhancement of the quasiparticle mean free path below the melting transition, implying a possible formation of a quasiparticle Bloch state in the periodic flux line lattice.
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