Magnetic Properties of Ni Alloys for Superconducting Wire Substrates: A First-Principles Study
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概要
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Ni-based alloys, especially Ni–W alloys, are widely used as substrates for high-temperature superconducting (HTSC) wires. Ni–W alloys have many useful properties, including, strength, flexibility, durability, and the ability to texture thin films grown on them. Ni metal has an fcc structure, and is well known to exhibit band magnetism on account of the splitting of its Ni 3d bands, which produce a non-integer magnetic moment per Ni atom (magnetic moment of Pure Ni: 0.6 $\mu_{\text{B}}$/atom). However, the magnetic moment in a Ni-based alloy substrate interferes with the superconducting behavior of the film. Consequently, suitable alloys with reduced ferromagnetism are required. In this paper, we report first-principles calculations of the magnetic moments of a series of Ni-based alloys by the Korringa–Kohn–Rostoker coherent-potential approximation (KKR-CPA) method within local-density approximation (LDA). Using the KKR-CPA method, it is possible to treat any given Ni alloy composition. Our calculation results reproduce the experimental data well, showing the concentration dependences of the magnetic moments of various Ni alloys. The series of calculations of Ni 3d metal, Ni 4d metal and Ni 5d metal alloys reveal early 4d and early 5d metals (i.e., Nb, Mo, Ta, and W) successfully lower the magnetic moments. For these elements, the magnetic moments of the alloys become zero at around 10 at. % owing to the strong hybridization between the Ni 3d band and the Nb/Mo 4d or Ta/W 5d band around the Fermi level.
- 2009-08-25
著者
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Kuwabara Akihide
Nanostructures Research Laboratory Japan Fine Ceramics Center
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FISHER Craig
Nanostructures Research Laboratory, Japan Fine Ceramics Center
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KATO Takeharu
Nanostructures Research Laboratory, Japan Fine Ceramics Center
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Moriwake Hiroki
Nanostructure Research Laboratory, Japan Fine Ceramics Center, Nagoya 456-8587, Japan
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Hirayama Tsukasa
Nanostructures Research Laboratory, Japan Fine Ceramics Center, Nagoya 456-8587, Japan
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Hirayama Tsukasa
Nanostructure Research Laboratory, Japan Fine Ceramics Center, Nagoya 456-8587, Japan
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Kuwabara Akihide
Nanostructure Research Laboratory, Japan Fine Ceramics Center, Nagoya 456-8587, Japan
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