1. ChemInform Abstract: Superconductivity in the Niobium-Rich Compound Nb5Se4
- Author
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Jason W. Krizan, Agnieszka L. Kozub, Tomasz Klimczuk, Kristen Baroudi, and Robert J. Cava
- Subjects
Superconductivity ,Niobium ,Analytical chemistry ,chemistry.chemical_element ,General Medicine ,Heat capacity ,Coherence length ,symbols.namesake ,chemistry.chemical_compound ,chemistry ,Electrical resistivity and conductivity ,Selenide ,symbols ,Critical field ,Debye model - Abstract
The niobium rich selenide compound Nb5Se4 was synthesized at ambient pressure by high-temperature solid–state reaction in a sealed Ta tube. Resistivity and heat capacity measurements reveal that this compound is superconducting, with a Tc = 1.85K. The electronic contribution to the specific heat γ and the Debye temperature are found to be 18.1 mJmol−1K−2 and 298 K respectively. The calculated electron-phonon coupling constant λep = 0.5 and the ΔCp/γTc = 1.42 ratio imply that Nb5Se4 is a weak coupling BCS superconductor. The upper critical field and coherence length are found to be 1.44 T and 15.1 nm, respectively.
- Published
- 2015
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