Optical conductivity of the nonsuperconducting cuprate La(8-x)Sr(x)Cu(8)O(20)

Details Optical conductivity of the nonsuperconducting cuprate La(8-x)Sr(x)Cu(8)O(20) Optical conductivity of the nonsuperconducting cuprate La(8-x)Sr(x)Cu(8)O(20)

2001-06-20

arxiv.org/abs/cond-mat/0106402v2

Physics

Condensed Matter

Superconductivity

Revised version submitted to Phys. Rev. B, including the elimination of Fig. 1 and changes to Figs. 4 and 5

Scientific paper

10.1103/PhysRevB.65.054511

La(8-x)Sr(x)Cu(8)O(20) is a non-superconducting cuprate, which exhibits a doubling of the elementary cell along the c axis. Its optical conductivity sigma (omega) has been first measured here, down to 20 K, in two single crystals with x = 1.56 and x = 2.24. Along c, sigma (omega) shows, in both samples, bands due to strongly bound charges, thus confirming 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 hardens considerably below 200 K, in correspondence of an anomalous increase in the sample dc resistivity, in agreement with its polaronic origin. This study allows one to establish relevant similarities and differences with respect to the spectrum of the ab plane of the superconducting cuprates.

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