Optical conductivity of the nonsuperconducting cuprate La8−xSrxCu8O20
A. Lucarelli, S. Lupi, P. Calvani, P. Maselli, G. De Marzi, P. Roy, N. L. Saini, A. Bianconi, T. Ito, K. Oka
DOI 10.1103/PhysRevB.65.054511 · Physical Review B
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Abstract
La8−xSrxCu8O20 is a nonsuperconducting cuprate which exhibits a doubling of the elementary cell along the c axis. Its optical conductivity has been first measured here, down to 20 K, in two single crystals with x=1.56 and x=2.24. Along c, bands are observed in both samples which correspond to strongly bound charges and confirm that the cell doubling is due to charge ordering. In the ab plane, in addition to the Drude term one observes an infrared peak at ∼0.1 eV and a midinfrared band at 0.7 eV. The 0.1-eV peak is found at higher frequencies below 200 K, in correspondence with an anomalous increase in the dc resistivity and consistently with its assignment to localized charges. These results point out similarities and differences with respect to the optical properties of superconducting cuprates.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Bi2Sr2CuO6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 20 | Pressure not reported | unknown |
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