Superconductivity in a new intermetallic structure type based on endohedral Ta@Ir7Ge4 clusters
| Autor: | Elizabeth M. Seibel, Laura C. Srivichitranond, R. J. Cava, Weiwei Xie, Tomasz Klimczuk, Zuzanna Sobczak |
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| Rok vydání: | 2017 |
| Předmět: |
Superconductivity
Materials science Condensed matter physics Fermi level Intermetallic 02 engineering and technology Electronic structure 021001 nanoscience & nanotechnology 01 natural sciences Magnetic susceptibility symbols.namesake Electrical resistivity and conductivity Condensed Matter::Superconductivity 0103 physical sciences symbols A15 phases 010306 general physics 0210 nano-technology Critical field |
| Zdroj: | Physical Review B. 95 |
| ISSN: | 2469-9969 2469-9950 |
| DOI: | 10.1103/physrevb.95.174521 |
| Popis: | 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 C/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. |
| Databáze: | OpenAIRE |
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