Superconducting properties of the non-Fermi-liquid system beta-YbAlB4

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...

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Veröffentlicht in:Physical review letters 2008-09, Vol.101 (13), p.137004-137004
Hauptverfasser: Kuga, K, Karaki, Y, Matsumoto, Y, Machida, Y, Nakatsuji, S
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Sprache:eng
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Zusammenfassung: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.
ISSN:0031-9007
DOI:10.1103/PhysRevLett.101.137004