Superconducting properties of the non-Fermi-liquid system beta-YbAlB4.
作者信息
Kuga K, Karaki Y, Matsumoto Y, Machida Y, Nakatsuji S
机构信息
Institute for Solid State Physics (ISSP), University of Tokyo, Kashiwa 277-8581, Japan.
出版信息
Phys Rev Lett. 2008 Sep 26;101(13):137004. doi: 10.1103/PhysRevLett.101.137004.
Abstract
beta-YbAlB4 is the first Yb-based heavy fermion superconductor with Tc = 80 mK. Our study using high-purity single crystals reveals that strongly type-II heavy fermion superconductivity emerges from the non-Fermi-liquid state with enhanced ferromagnetic fluctuations. High sensitivity of Tc to sample purity indicates strong pair-breaking effects due to impurities, probably of nonmagnetic type, suggesting an unconventional character of the superconductivity.
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