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Synthesis, crystal structure and properties of the new superconductors TaRuB and NbOsB

MPS-Authors
http://pubman.mpdl.mpg.de/cone/persons/resource/persons126933

Zheng,  Qiang
Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons126632

Gumeniuk,  Roman
Roman Gumeniuk, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons126819

Rosner,  Helge
Helge Rosner, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons126838

Schnelle,  Walter
Walter Schnelle, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons126806

Prots,  Yurii
Yuri Prots, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons126556

Burkhardt,  Ulrich
Ulrich Burkhardt, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons126626

Grin,  Yuri
Juri Grin, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons126726

Leithe-Jasper,  Andreas
Andreas Leithe-Jasper, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Zheng, Q., Gumeniuk, R., Rosner, H., Schnelle, W., Prots, Y., Burkhardt, U., et al. (2015). Synthesis, crystal structure and properties of the new superconductors TaRuB and NbOsB. Journal of Physics: Condensed Matter, 27(41): 415701, pp. 1-12. doi:10.1088/0953-8984/27/41/415701.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0028-9221-9
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 IMG [http://ej.iop.org/images/0953-8984/27/41/415701/cmaa0309ieqn001.gif] {{T}_{̑ext{c}}}≈ 4} K. Electronic structure calculations by DFT methods show that 4 d and 5 d transition-metal states dominate the density of states (DOS) at the Fermi level IMG [http://ej.iop.org/images/0953-8984/27/41/415701/cmaa0309ieqn002.gif] {{{E}_{̑ext{F}}}} with a pronounced quasi one-dimensional behaviour along the [0 0 1] direction. Comparison of the calculated DOS at IMG [http://ej.iop.org/images/0953-8984/27/41/415701/cmaa0309ieqn003.gif] {{{E}_{̑ext{F}}}} with specific heat data reveals a moderate electron–phonon coupling. Possible small boron vacancies could significantly reduce the DOS at IMG [http://ej.iop.org/images/0953-8984/27/41/415701/cmaa0309ieqn004.gif] {{{E}_{̑ext{F}}}} , hence decrease IMG [http://ej.iop.org/images/0953-8984/27/41/415701/cmaa0309ieqn005.gif] {{{T}_{̑ext{c}}}} for samples annealed at higher temperatures. For NbOsB, the DOS( IMG [http://ej.iop.org/images/0953-8984/27/41/415701/cmaa0309ieqn006.gif] {{{E}_{̑ext{F}}}} ) is strongly reduced due to an increase of covalent bonding interactions between Os and B. Accordingly, a lower IMG [http://ej.iop.org/images/0953-8984/27/41/415701/cmaa0309ieqn007.gif] {{{T}_{̑ext{c}}}} IMG [http://ej.iop.org/images/0953-8984/27/41/415701/cmaa0309ieqn008.gif] {≈ 1 K is observed.