155 research outputs found
Optical conductivity of the nonsuperconducting cuprate La(8-x)Sr(x)Cu(8)O(20)
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.Comment: Revised version submitted to Phys. Rev. B, including the elimination
of Fig. 1 and changes to Figs. 4 and
Fracture mechanics model of stone comminution in ESWL and implications for tissue damage
Design and characterization of a research electrohydraulic lithotripter patterned after the Dornier HM3
Apparent viscosity of a fibrous suspension confined in the gap clearance of a refining machine
Pulp and paper from "Dwarf Cavendish" pseudo-stems
info:eu-repo/semantics/publishedVersio
Elaboration de couches minces nanocomposites sur support souple par voie sol-gel.
International audienceElaboration de couches minces nanocomposites sur support souple par voie sol-gel
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