Disorder-sensitive superconductivity in the doped iron silicide superconductor (Lu_1−xR_x)₂Fe₃Si₅ (R=Sc, Y, and Dy)

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Tadataka Watanabe, Hiroki Sasame, Hiroaki Okuyama, Kouichi Takase, and Yoshiki Takano
Department of Physics, College of Science and Technology (CST), Nihon University, Chiyoda-ku, Tokyo 101-8308, Japan

Received 30 June 2009; published 8 September 2009

Westudied the effect of nonmagnetic and magnetic impurities on superconductivityin Lu₂Fe₃Si₅ by small-amount substitution of the Lu site andinvestigated structural, magnetic, and electrical properties of nonmagnetic (Lu_1−xSc_x)₂Fe₃Si₅, (Lu_1−xY_x)₂Fe₃Si₅,and magnetic (Lu_1−xDy_x)₂Fe₃Si₅. The rapid depression of T_c by nonmagneticimpurities in accordance with the increase in the residual resistivityreveals the strong pair breaking dominated by disorder.

URL:	http://link.aps.org/doi/10.1103/PhysRevB.80.100502
DOI:	10.1103/PhysRevB.80.100502
PACS:	74.20.Rp; 74.62.Dh; 74.70.Dd; 74.25.Jb 74.20.Rp Pairing symmetries (other than s-wave) in superconductivity theory 74.62.Dh Effects of crystal defects, doping and substitution on superconducting transition temperature 74.70.Dd Superconducting ternary, quaternary and multinary compounds 74.25.Jb Electronic structure of superconductors YEAR: 2009
KEYWORDS:	dysprosium compounds, electrical resistivity, impurities, iron compounds, lutetium compounds, magnetic susceptibility, scandium compounds, superconducting materials, superconducting transition temperature, yttrium compounds

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