Abstract
Two new ternary compounds TaRuB and NbOsB were synthesized by arc-melting and annealing at 1500–1850 °C. They crystallize in orthorhombic primitive structures with space group Pbam. Magnetic susceptibility, electrical resistivity, and specific heat measurements reveal bulk superconductivity for metallic TaRuB with a K. Electronic structure calculations by DFT methods show that 4d and 5d transition-metal states dominate the density of states (DOS) at the Fermi level with a pronounced quasi one-dimensional behaviour along the [0 0 1] direction. Comparison of the calculated DOS at with specific heat data reveals a moderate electron–phonon coupling. Possible small boron vacancies could significantly reduce the DOS at , hence decrease for samples annealed at higher temperatures. For NbOsB, the DOS() is strongly reduced due to an increase of covalent bonding interactions between Os and B. Accordingly, a lower K is observed.
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