Superconducting properties of the non-Fermi-liquid system beta-YbAlB4.
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.
Institute for Solid State Physics (ISSP), University of Tokyo, Kashiwa 277-8581, Japan.
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Kuga
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Karaki
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Matsumoto
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Machida
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Nakatsuji