期刊
PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS
卷 546, 期 -, 页码 34-43出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physc.2017.12.005
关键词
-
资金
- Friedrich und Elisabeth Boysen-Stiftung
Alkali metal doped fullerides (A(3)C(60)) are superconductors with critical temperatures, T-c, extending up to 38 K. T-c 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 T-c from very early up to recent measurements. We disentangle alkali atom chemical effects on T-c, beyond the well-known consequences of changing a. It is found that T-c, 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. (C) 2017 Elsevier B.V. All rights reserved.
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