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LaCo2B2: A Co-based layered superconductor with a ThCr2Si2-type structure

By Hiroshi Mizoguchi, Toshiaki Kuroda, Toshio Kamiya and Hideo Hosono


LaCo2B2 with a ThCr2Si2-type structure composed of alternately stacked La and CoB layers exhibits metallic electrical conductivity and Pauli paramagnetic behavior down to 2K. Bulk superconductivity with a Tc of ~4K emerges upon substitution with dopant elements; i.e., isovalent substitution to form (La1-xYx)Co2B2, or aliovalent substitution to form La(Co1-xFex)2B2. Highly covalent bonding between Co 3d and B 2p levels in the CoB layers, which is caused by the B 2p level being shallower than the Fermi level, removes magnetic ordering from Co 3d electrons even in the undoped samples.Comment: 3 figure

Topics: Condensed Matter - Superconductivity
Year: 2011
DOI identifier: 10.1103/PhysRevLett.106.237001
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