Chemical effects of alkali atoms on critical temperature in superconducting alkali-doped fullerides
| Autor: | Susanne Roth, Ralf Srama, Hans Peter Roeser, F. Hetfleisch, Olle Gunnarsson, Jong E. Han, M. Mashmool, M. Stepper, J.S. López, A. Bohr |
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| Rok vydání: | 2018 |
| Předmět: |
Condensed Matter::Quantum Gases
chemistry.chemical_classification Superconductivity Alkali atoms Materials science Base (chemistry) Doping Energy Engineering and Power Technology 02 engineering and technology 021001 nanoscience & nanotechnology Condensed Matter Physics Alkali metal 01 natural sciences Electronic Optical and Magnetic Materials Chemical effects Lattice constant chemistry Chemical physics 0103 physical sciences Atom Physics::Atomic and Molecular Clusters Physics::Atomic Physics Electrical and Electronic Engineering 010306 general physics 0210 nano-technology |
| Zdroj: | Physica C: Superconductivity and its Applications. 546:34-43 |
| ISSN: | 0921-4534 |
| Popis: | Alkali metal doped fullerides (A3C60) are superconductors with critical temperatures, Tc, extending up to 38 K. Tc is known to depend strongly on the lattice parameter a, which can be adjusted by physical or chemical pressure. In the latter case an alkali atom is replaced by a different sized one, which changes a. We have collected an extensive data base of experimental data for Tc from very early up to recent measurements. We disentangle alkali atom chemical effects on Tc, beyond the well-known consequences of changing a. It is found that Tc, for a fixed a, is typically increased as smaller alkali atoms are replaced by larger ones, except for very large a. Possible reasons for these results are discussed. Although smaller in size than the lattice parameter contribution, the chemical effect is not negligible and should be considered in future physical model developments. |
| Databáze: | OpenAIRE |
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