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Superconductivity in a new intermetallic structure type based on endohedral Ta@ i r7 G e4 clusters

Author(s): Srivichitranond, Laura C.; Seibel, Elizabeth M.; Xie, Weiwei; Sobczak, Zuzanna; Klimczuk, Tomasz; et al

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Abstract: © 2017 American Physical Society. We report the observation of superconductivity at a temperature near 3.5 K for the previously unreported compound TaIr2Ge2. In addition to being a superconductor, this material displays a new crystal structure type that contains endohedral clusters, as determined by single-crystal x-ray diffraction structure refinement; the structure is more complex than those of the commonly observed tetragonal 122 intermetallic phases. Despite the strong metal-metal interactions, electronic structure calculations show the presence of a relatively simple set of states at the Fermi level, consisting mostly of Ta atom orbital contributions. The superconducting transition is characterized by temperature-dependent resistivity, magnetic susceptibility and specific heat measurements, and is of the weak coupling BCS type with ΔC/γTc=1.55. The upper critical field at 0 K is estimated to be 2 T. Basic characterization of the superconductivity suggests that this material is similar to PbTaSe2, for which the effects of spin-orbit coupling may be important.
Publication Date: 1-May-2017
Electronic Publication Date: 30-May-2017
Citation: Srivichitranond, Laura C., Seibel, Elizabeth M., Xie, Weiwei, Sobczak, Zuzanna, Klimczuk, Tomasz, Cava, Robert J. (2017). Superconductivity in a new intermetallic structure type based on endohedral Ta@ i r7 G e4 clusters. Physical Review B, 95 (17), 10.1103/PhysRevB.95.174521
DOI: doi:10.1103/PhysRevB.95.174521
ISSN: 2469-9950
EISSN: 2469-9969
Pages: 95.17:174521-1 - 174521-7
Type of Material: Journal Article
Journal/Proceeding Title: Physical Review B
Version: Final published version. Article is made available in OAR by the publisher's permission or policy.
Notes: Physical Review B. Volume 95, Issue 17, 30 May 2017, Article number 174521.

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