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arXiv 1208.4680cond-mat.str-el
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β-YbAlB_4中c-f杂化和双组分霍尔效应的演化

Evolution of c-f hybridization and two component Hall effect in β-YbAlB_4

E. C. T. O'Farrell, Y. Matsumoto, S. Nakatsuji

摘要:

β-YbAlB_4是一种独特的重费米子超导体,它具有非常规的量子临界性,不需要在强中间价态上调谐。尽管大的相干温度,设置的纵向电阻率的峰值,我们的霍尔效应测量表明,共振偏斜散射从非相干的本地时刻持续到至少~40 K,其中霍尔系数表现出明显的最小信号的另一个形成的相干性。观测结果强烈地表明,f矩和传导电子之间的杂化具有两个分量的特征,具有明显的近藤或相干标度T_K,约为40 K和200 K,这一点由ρ_xy的磁场依赖性得到了证实。

英文摘要:

β-YbAlB_4 is the unique heavy fermion superconductor that exhibits unconventional quantum criticality without tuning in a strongly intermediate valence state. Despite the large coherence temperature, set by the peak of the longitudinal resistivity, our Hall effect measurements reveal that resonant skew scattering from incoherent local moments persists down to at least ~40 K, where the Hall coefficient exhibits a distinct minimum signaling another formation of coherence. The observation strongly suggests that the hybridization between f-moments and conduction electrons has a two component character with distinct Kondo or coherence scales T_K of ~40 K and 200 K; this is confirmed by the magnetic field dependence of ρ_xy.

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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