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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:Heat capacity measurements on the recently discovered geometrically frustrated beta-pyrochlore superconductor RbOs2O6 (T-c = 6.4 K) yield a Sommerfeld coefficient of 44 mJ/mol(f.u.)/K-2. This is about four times larger than the one found in band structure calculations. In order to specify the enhancement due to electron-electron interactions, we have measured the electron-phonon enhancement. By a suitable analysis, an electron-phonon coupling constant lambda(ep) = 1 +/- 0.1 is derived from the specific heat jump at T-c. This leaves a significant additional lambda(add) = 2.1 +/- 0.3 for enhancement due to other mechanisms, possibly related to the triangular lattice. To arrive at these results, an appropriate analysis method for bulk thermodynamic data based on the condensation energy was applied. (c) 2006 Elsevier B.V. All rights reserved.