Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2008-12-05
Physical Review B 80 (2009) 035107
Physics
Condensed Matter
Strongly Correlated Electrons
11 pages, 14 figures
Scientific paper
10.1103/PhysRevB.80.035107
We report optical spectra of Lu$_5$Ir$_4$Si$_{10}$ and Er$_5$Ir$_4$Si$_{10}$, exhibiting the phenomenon of coexisting superconductivity or antiferromagnetism and charge density wave (CDW) order. We measure the maximum value of the charge density wave gap present on part of the Fermi surface of Lu5Ir4Si10, corresponding to a ratio 2\Delta/k_B T_CDW \approx 10, well above the value in the limit of weak electron-phonon coupling. Strong electron-phonon coupling was confirmed by analyzing the optical conductivity with the Holstein model describing the electron-phonon interactions, indicating the coupling to phonons centered at 30 meV, with a coupling constant \lambda \approx 2.6. Finally we provide evidence that approximately 16 % of the Fermi surface of Lu5Ir4Si10 becomes gapped in the CDW state.
Carbone Fabrizio
der Marel Dirk van
Kuzmenko Alexey B.
Mydosh John A.
Tediosi Riccardo
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