Abstract
We report the crystal structures and physical properties of a novel boride Ca1+ϵCo4B4. This is a Gd1+ϵFe4B4-type compound, composed of tetrahedral chains of CoB and infinite atomic chains of Ca, with independent translation periods cCa and cCo. This is the first boride of this structural type that has a divalent metal at the rare earth site. The very low electrical resistivity showing linear decrease with decreasing temperature indicated a highly metallic nature of Ca1+ϵCo4B4. The very small magnetization suggested that Ca1+ϵCo4B4 is paramagnetic. First-principles calculations supported this paramagnetism, and revealed the nature of chemical bonding and electric conduction in this compound.
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