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arXiv 1502.07394cond-mat.str-el
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重费米子化合物CeRhIn5的场致密度波

Field induced density wave in the heavy fermion compound CeRhIn5

Philip J. W. Moll, Bin Zeng, Luis Balicas, Stanislaw Galeski, Fedor F. Balakirev, Eric D. Bauer, Filip Ronning

摘要:

由于4f态接近费米能,含有Ce的金属通常显示出强的电子相关性,导致与传导电子的强耦合。这种耦合通常会引起各种竞争的基态,包括重费米子金属,磁性和非常规超导性。CeTMIn_5(TM=Co,Rh,Ir)的d波超导性由于其与铜氧化物高温超导体的性质相似而引起了人们极大的兴趣。在这里,我们展示了一个领域诱导相变的一个国家类似于密度波(DW)的重费米子CeRhIn5,存在于其非常规的超导性附近的证据。DW状态由面内电阻率中的滞后异常发出信号,伴随着在高磁场(> 27 T)下非线性电输运的出现,这是密度波状态的独特特征。异常大的滞后使我们能够直接调查的费米面的过冷电子系统,并清楚地关联费米面重建与过渡。我们观察的关键是单晶微结构的制造,这被发现是高度敏感的“微妙”相变只涉及费米表面的一小部分。这种微妙的秩序可能是一个共同的特点,在相关的电子系统,它的清晰的观察增加了一个新的视角,类似微妙的CDW状态的铜酸盐。

英文摘要:

Metals containing Ce often show strong electron correlations due to the proximity of the 4f state to the Fermi energy, leading to strong coupling with the conduction electrons. This coupling typically induces a variety of competing ground states, including heavy-fermion metals, magnetism and unconventional superconductivity. The d-wave superconductivity in CeTMIn5 (TM=Co, Rh, Ir) has attracted significant interest due to its qualitative similarity to the cuprate high-Tc superconductors. Here, we show evidence for a field induced phase-transition to a state akin to a density-wave (DW) in the heavy fermion CeRhIn5, existing in proximity to its unconventional superconductivity. The DW state is signaled by a hysteretic anomaly in the in-plane resistivity accompanied by the appearance of non-linear electrical transport at high magnetic fields (>27T), which are the distinctive characteristics of density-wave states. The unusually large hysteresis enables us to directly investigate the Fermi surface of a supercooled electronic system and to clearly associate a Fermi surface reconstruction with the transition. Key to our observation is the fabrication of single crystal microstructures, which are found to be highly sensitive to "subtle" phase transitions involving only small portions of the Fermi surface. Such subtle order might be a common feature among correlated electron systems, and its clear observation adds a new perspective on the similarly subtle CDW state in the cuprates.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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