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

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.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0028-9221-9 Version Permalink: http://hdl.handle.net/21.11116/0000-0001-1816-C
Genre: Journal Article

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 Creators:
Zheng, Qiang1, Author              
Gumeniuk, Roman2, Author              
Rosner, Helge3, Author              
Schnelle, Walter4, Author              
Prots, Yurii5, Author              
Burkhardt, Ulrich6, Author              
Grin, Yuri7, Author              
Leithe-Jasper, Andreas8, Author              
Affiliations:
1Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863405              
2Roman Gumeniuk, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863421              
3Helge Rosner, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863450              
4Walter Schnelle, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863441              
5Yuri Prots, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863424              
6Ulrich Burkhardt, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863422              
7Juri Grin, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863413              
8Andreas Leithe-Jasper, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863406              

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 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.

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Language(s): eng - English
 Dates: 2015-09-292015-09-29
 Publication Status: Published in print
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 Rev. Method: -
 Identifiers: BibTex Citekey: 0953-8984-27-41-415701
DOI: 10.1088/0953-8984/27/41/415701
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Title: Journal of Physics: Condensed Matter
  Abbreviation : J. Phys.: Condens. Matter
Source Genre: Journal
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Publ. Info: Bristol, UK : IOP Publishing
Pages: - Volume / Issue: 27 (41) Sequence Number: 415701 Start / End Page: 1 - 12 Identifier: ISSN: 0953-8984
CoNE: /journals/resource/954928562478